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init: 64 bits version of the webcam

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Nicolas RACOT
2026-07-13 16:31:52 +02:00
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include/opencv2/highgui.hpp
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@ -40,12 +40,16 @@
//
//M*/
#ifndef __OPENCV_HIGHGUI_HPP__
#define __OPENCV_HIGHGUI_HPP__
#ifndef OPENCV_HIGHGUI_HPP
#define OPENCV_HIGHGUI_HPP
#include "opencv2/core.hpp"
#ifdef HAVE_OPENCV_IMGCODECS
#include "opencv2/imgcodecs.hpp"
#endif
#ifdef HAVE_OPENCV_VIDEOIO
#include "opencv2/videoio.hpp"
#endif
/**
@defgroup highgui High-level GUI
@ -79,49 +83,90 @@ It provides easy interface to:
attached to the control panel is a trackbar, or the control panel is empty, a new buttonbar is
created. Then, a new button is attached to it.
See below the example used to generate the figure: :
See below the example used to generate the figure:
@code
int main(int argc, char *argv[])
{
int value = 50;
int value2 = 0;
cvNamedWindow("main1",CV_WINDOW_NORMAL);
cvNamedWindow("main2",CV_WINDOW_AUTOSIZE | CV_GUI_NORMAL);
cvCreateTrackbar( "track1", "main1", &value, 255, NULL);//OK tested
char* nameb1 = "button1";
char* nameb2 = "button2";
cvCreateButton(nameb1,callbackButton,nameb1,CV_CHECKBOX,1);
namedWindow("main1",WINDOW_NORMAL);
namedWindow("main2",WINDOW_AUTOSIZE | CV_GUI_NORMAL);
createTrackbar( "track1", "main1", &value, 255, NULL);
cvCreateButton(nameb2,callbackButton,nameb2,CV_CHECKBOX,0);
cvCreateTrackbar( "track2", NULL, &value2, 255, NULL);
cvCreateButton("button5",callbackButton1,NULL,CV_RADIOBOX,0);
cvCreateButton("button6",callbackButton2,NULL,CV_RADIOBOX,1);
String nameb1 = "button1";
String nameb2 = "button2";
cvSetMouseCallback( "main2",on_mouse,NULL );
createButton(nameb1,callbackButton,&nameb1,QT_CHECKBOX,1);
createButton(nameb2,callbackButton,NULL,QT_CHECKBOX,0);
createTrackbar( "track2", NULL, &value2, 255, NULL);
createButton("button5",callbackButton1,NULL,QT_RADIOBOX,0);
createButton("button6",callbackButton2,NULL,QT_RADIOBOX,1);
IplImage* img1 = cvLoadImage("files/flower.jpg");
IplImage* img2 = cvCreateImage(cvGetSize(img1),8,3);
CvCapture* video = cvCaptureFromFile("files/hockey.avi");
IplImage* img3 = cvCreateImage(cvGetSize(cvQueryFrame(video)),8,3);
setMouseCallback( "main2",on_mouse,NULL );
while(cvWaitKey(33) != 27)
Mat img1 = imread("files/flower.jpg");
VideoCapture video;
video.open("files/hockey.avi");
Mat img2,img3;
while( waitKey(33) != 27 )
{
cvAddS(img1,cvScalarAll(value),img2);
cvAddS(cvQueryFrame(video),cvScalarAll(value2),img3);
cvShowImage("main1",img2);
cvShowImage("main2",img3);
img1.convertTo(img2,-1,1,value);
video >> img3;
imshow("main1",img2);
imshow("main2",img3);
}
cvDestroyAllWindows();
cvReleaseImage(&img1);
cvReleaseImage(&img2);
cvReleaseImage(&img3);
cvReleaseCapture(&video);
destroyAllWindows();
return 0;
}
@endcode
@defgroup highgui_winrt WinRT support
This figure explains new functionality implemented with WinRT GUI. The new GUI provides an Image control,
and a slider panel. Slider panel holds trackbars attached to it.
Sliders are attached below the image control. Every new slider is added below the previous one.
See below the example used to generate the figure:
@code
void sample_app::MainPage::ShowWindow()
{
static cv::String windowName("sample");
cv::winrt_initContainer(this->cvContainer);
cv::namedWindow(windowName); // not required
cv::Mat image = cv::imread("Assets/sample.jpg");
cv::Mat converted = cv::Mat(image.rows, image.cols, CV_8UC4);
cv::cvtColor(image, converted, COLOR_BGR2BGRA);
cv::imshow(windowName, converted); // this will create window if it hasn't been created before
int state = 42;
cv::TrackbarCallback callback = [](int pos, void* userdata)
{
if (pos == 0) {
cv::destroyWindow(windowName);
}
};
cv::TrackbarCallback callbackTwin = [](int pos, void* userdata)
{
if (pos >= 70) {
cv::destroyAllWindows();
}
};
cv::createTrackbar("Sample trackbar", windowName, &state, 100, callback);
cv::createTrackbar("Twin brother", windowName, &state, 100, callbackTwin);
}
@endcode
@defgroup highgui_c C API
@}
*/
@ -133,108 +178,137 @@ namespace cv
//! @addtogroup highgui
//! @{
// Flags for namedWindow
enum { WINDOW_NORMAL = 0x00000000, // the user can resize the window (no constraint) / also use to switch a fullscreen window to a normal size
WINDOW_AUTOSIZE = 0x00000001, // the user cannot resize the window, the size is constrainted by the image displayed
WINDOW_OPENGL = 0x00001000, // window with opengl support
//! Flags for cv::namedWindow
enum WindowFlags {
WINDOW_NORMAL = 0x00000000, //!< the user can resize the window (no constraint) / also use to switch a fullscreen window to a normal size.
WINDOW_AUTOSIZE = 0x00000001, //!< the user cannot resize the window, the size is constrainted by the image displayed.
WINDOW_OPENGL = 0x00001000, //!< window with opengl support.
WINDOW_FULLSCREEN = 1, // change the window to fullscreen
WINDOW_FREERATIO = 0x00000100, // the image expends as much as it can (no ratio constraint)
WINDOW_KEEPRATIO = 0x00000000 // the ratio of the image is respected
WINDOW_FULLSCREEN = 1, //!< change the window to fullscreen.
WINDOW_FREERATIO = 0x00000100, //!< the image expends as much as it can (no ratio constraint).
WINDOW_KEEPRATIO = 0x00000000, //!< the ratio of the image is respected.
WINDOW_GUI_EXPANDED=0x00000000, //!< status bar and tool bar
WINDOW_GUI_NORMAL = 0x00000010, //!< old fashious way
};
//! Flags for cv::setWindowProperty / cv::getWindowProperty
enum WindowPropertyFlags {
WND_PROP_FULLSCREEN = 0, //!< fullscreen property (can be WINDOW_NORMAL or WINDOW_FULLSCREEN).
WND_PROP_AUTOSIZE = 1, //!< autosize property (can be WINDOW_NORMAL or WINDOW_AUTOSIZE).
WND_PROP_ASPECT_RATIO = 2, //!< window's aspect ration (can be set to WINDOW_FREERATIO or WINDOW_KEEPRATIO).
WND_PROP_OPENGL = 3, //!< opengl support.
WND_PROP_VISIBLE = 4 //!< checks whether the window exists and is visible
};
// Flags for set / getWindowProperty
enum { WND_PROP_FULLSCREEN = 0, // fullscreen property (can be WINDOW_NORMAL or WINDOW_FULLSCREEN)
WND_PROP_AUTOSIZE = 1, // autosize property (can be WINDOW_NORMAL or WINDOW_AUTOSIZE)
WND_PROP_ASPECT_RATIO = 2, // window's aspect ration (can be set to WINDOW_FREERATIO or WINDOW_KEEPRATIO);
WND_PROP_OPENGL = 3 // opengl support
//! Mouse Events see cv::MouseCallback
enum MouseEventTypes {
EVENT_MOUSEMOVE = 0, //!< indicates that the mouse pointer has moved over the window.
EVENT_LBUTTONDOWN = 1, //!< indicates that the left mouse button is pressed.
EVENT_RBUTTONDOWN = 2, //!< indicates that the right mouse button is pressed.
EVENT_MBUTTONDOWN = 3, //!< indicates that the middle mouse button is pressed.
EVENT_LBUTTONUP = 4, //!< indicates that left mouse button is released.
EVENT_RBUTTONUP = 5, //!< indicates that right mouse button is released.
EVENT_MBUTTONUP = 6, //!< indicates that middle mouse button is released.
EVENT_LBUTTONDBLCLK = 7, //!< indicates that left mouse button is double clicked.
EVENT_RBUTTONDBLCLK = 8, //!< indicates that right mouse button is double clicked.
EVENT_MBUTTONDBLCLK = 9, //!< indicates that middle mouse button is double clicked.
EVENT_MOUSEWHEEL = 10,//!< positive and negative values mean forward and backward scrolling, respectively.
EVENT_MOUSEHWHEEL = 11 //!< positive and negative values mean right and left scrolling, respectively.
};
enum { EVENT_MOUSEMOVE = 0,
EVENT_LBUTTONDOWN = 1,
EVENT_RBUTTONDOWN = 2,
EVENT_MBUTTONDOWN = 3,
EVENT_LBUTTONUP = 4,
EVENT_RBUTTONUP = 5,
EVENT_MBUTTONUP = 6,
EVENT_LBUTTONDBLCLK = 7,
EVENT_RBUTTONDBLCLK = 8,
EVENT_MBUTTONDBLCLK = 9,
EVENT_MOUSEWHEEL = 10,
EVENT_MOUSEHWHEEL = 11
//! Mouse Event Flags see cv::MouseCallback
enum MouseEventFlags {
EVENT_FLAG_LBUTTON = 1, //!< indicates that the left mouse button is down.
EVENT_FLAG_RBUTTON = 2, //!< indicates that the right mouse button is down.
EVENT_FLAG_MBUTTON = 4, //!< indicates that the middle mouse button is down.
EVENT_FLAG_CTRLKEY = 8, //!< indicates that CTRL Key is pressed.
EVENT_FLAG_SHIFTKEY = 16,//!< indicates that SHIFT Key is pressed.
EVENT_FLAG_ALTKEY = 32 //!< indicates that ALT Key is pressed.
};
enum { EVENT_FLAG_LBUTTON = 1,
EVENT_FLAG_RBUTTON = 2,
EVENT_FLAG_MBUTTON = 4,
EVENT_FLAG_CTRLKEY = 8,
EVENT_FLAG_SHIFTKEY = 16,
EVENT_FLAG_ALTKEY = 32
//! Qt font weight
enum QtFontWeights {
QT_FONT_LIGHT = 25, //!< Weight of 25
QT_FONT_NORMAL = 50, //!< Weight of 50
QT_FONT_DEMIBOLD = 63, //!< Weight of 63
QT_FONT_BOLD = 75, //!< Weight of 75
QT_FONT_BLACK = 87 //!< Weight of 87
};
// Qt font
enum { QT_FONT_LIGHT = 25, //QFont::Light,
QT_FONT_NORMAL = 50, //QFont::Normal,
QT_FONT_DEMIBOLD = 63, //QFont::DemiBold,
QT_FONT_BOLD = 75, //QFont::Bold,
QT_FONT_BLACK = 87 //QFont::Black
//! Qt font style
enum QtFontStyles {
QT_STYLE_NORMAL = 0, //!< Normal font.
QT_STYLE_ITALIC = 1, //!< Italic font.
QT_STYLE_OBLIQUE = 2 //!< Oblique font.
};
// Qt font style
enum { QT_STYLE_NORMAL = 0, //QFont::StyleNormal,
QT_STYLE_ITALIC = 1, //QFont::StyleItalic,
QT_STYLE_OBLIQUE = 2 //QFont::StyleOblique
//! Qt "button" type
enum QtButtonTypes {
QT_PUSH_BUTTON = 0, //!< Push button.
QT_CHECKBOX = 1, //!< Checkbox button.
QT_RADIOBOX = 2, //!< Radiobox button.
QT_NEW_BUTTONBAR = 1024 //!< Button should create a new buttonbar
};
// Qt "button" type
enum { QT_PUSH_BUTTON = 0,
QT_CHECKBOX = 1,
QT_RADIOBOX = 2
};
/** @brief Callback function for mouse events. see cv::setMouseCallback
@param event one of the cv::MouseEventTypes constants.
@param x The x-coordinate of the mouse event.
@param y The y-coordinate of the mouse event.
@param flags one of the cv::MouseEventFlags constants.
@param userdata The optional parameter.
*/
typedef void (*MouseCallback)(int event, int x, int y, int flags, void* userdata);
/** @brief Callback function for Trackbar see cv::createTrackbar
@param pos current position of the specified trackbar.
@param userdata The optional parameter.
*/
typedef void (*TrackbarCallback)(int pos, void* userdata);
/** @brief Callback function defined to be called every frame. See cv::setOpenGlDrawCallback
@param userdata The optional parameter.
*/
typedef void (*OpenGlDrawCallback)(void* userdata);
/** @brief Callback function for a button created by cv::createButton
@param state current state of the button. It could be -1 for a push button, 0 or 1 for a check/radio box button.
@param userdata The optional parameter.
*/
typedef void (*ButtonCallback)(int state, void* userdata);
/** @brief Creates a window.
@param winname Name of the window in the window caption that may be used as a window identifier.
@param flags Flags of the window. The supported flags are:
> - **WINDOW_NORMAL** If this is set, the user can resize the window (no constraint).
> - **WINDOW_AUTOSIZE** If this is set, the window size is automatically adjusted to fit the
> displayed image (see imshow ), and you cannot change the window size manually.
> - **WINDOW_OPENGL** If this is set, the window will be created with OpenGL support.
The function namedWindow creates a window that can be used as a placeholder for images and
trackbars. Created windows are referred to by their names.
If a window with the same name already exists, the function does nothing.
You can call destroyWindow or destroyAllWindows to close the window and de-allocate any associated
You can call cv::destroyWindow or cv::destroyAllWindows to close the window and de-allocate any associated
memory usage. For a simple program, you do not really have to call these functions because all the
resources and windows of the application are closed automatically by the operating system upon exit.
@note
Qt backend supports additional flags:
- **CV_WINDOW_NORMAL or CV_WINDOW_AUTOSIZE:** CV_WINDOW_NORMAL enables you to resize the
window, whereas CV_WINDOW_AUTOSIZE adjusts automatically the window size to fit the
- **WINDOW_NORMAL or WINDOW_AUTOSIZE:** WINDOW_NORMAL enables you to resize the
window, whereas WINDOW_AUTOSIZE adjusts automatically the window size to fit the
displayed image (see imshow ), and you cannot change the window size manually.
- **CV_WINDOW_FREERATIO or CV_WINDOW_KEEPRATIO:** CV_WINDOW_FREERATIO adjusts the image
with no respect to its ratio, whereas CV_WINDOW_KEEPRATIO keeps the image ratio.
- **CV_GUI_NORMAL or CV_GUI_EXPANDED:** CV_GUI_NORMAL is the old way to draw the window
without statusbar and toolbar, whereas CV_GUI_EXPANDED is a new enhanced GUI.
By default, flags == CV_WINDOW_AUTOSIZE | CV_WINDOW_KEEPRATIO | CV_GUI_EXPANDED
- **WINDOW_FREERATIO or WINDOW_KEEPRATIO:** WINDOW_FREERATIO adjusts the image
with no respect to its ratio, whereas WINDOW_KEEPRATIO keeps the image ratio.
- **WINDOW_GUI_NORMAL or WINDOW_GUI_EXPANDED:** WINDOW_GUI_NORMAL is the old way to draw the window
without statusbar and toolbar, whereas WINDOW_GUI_EXPANDED is a new enhanced GUI.
By default, flags == WINDOW_AUTOSIZE | WINDOW_KEEPRATIO | WINDOW_GUI_EXPANDED
@param winname Name of the window in the window caption that may be used as a window identifier.
@param flags Flags of the window. The supported flags are: (cv::WindowFlags)
*/
CV_EXPORTS_W void namedWindow(const String& winname, int flags = WINDOW_AUTOSIZE);
/** @brief Destroys a window.
@param winname Name of the window to be destroyed.
/** @brief Destroys the specified window.
The function destroyWindow destroys the window with the given name.
@param winname Name of the window to be destroyed.
*/
CV_EXPORTS_W void destroyWindow(const String& winname);
@ -246,9 +320,16 @@ CV_EXPORTS_W void destroyAllWindows();
CV_EXPORTS_W int startWindowThread();
/** @brief Waits for a pressed key.
/** @brief Similar to #waitKey, but returns full key code.
@param delay Delay in milliseconds. 0 is the special value that means "forever".
@note
Key code is implementation specific and depends on used backend: QT/GTK/Win32/etc
*/
CV_EXPORTS_W int waitKeyEx(int delay = 0);
/** @brief Waits for a pressed key.
The function waitKey waits for a key event infinitely (when \f$\texttt{delay}\leq 0\f$ ) or for delay
milliseconds, when it is positive. Since the OS has a minimum time between switching threads, the
@ -266,131 +347,132 @@ takes care of event processing.
The function only works if there is at least one HighGUI window created and the window is active.
If there are several HighGUI windows, any of them can be active.
@param delay Delay in milliseconds. 0 is the special value that means "forever".
*/
CV_EXPORTS_W int waitKey(int delay = 0);
/** @brief Displays an image in the specified window.
@param winname Name of the window.
@param mat Image to be shown.
The function imshow displays an image in the specified window. If the window was created with the
CV_WINDOW_AUTOSIZE flag, the image is shown with its original size, however it is still limited by the screen resolution.
cv::WINDOW_AUTOSIZE flag, the image is shown with its original size, however it is still limited by the screen resolution.
Otherwise, the image is scaled to fit the window. The function may scale the image, depending on its depth:
- If the image is 8-bit unsigned, it is displayed as is.
- If the image is 16-bit unsigned or 32-bit integer, the pixels are divided by 256. That is, the
value range [0,255\*256] is mapped to [0,255].
- If the image is 32-bit floating-point, the pixel values are multiplied by 255. That is, the
- If the image is 32-bit or 64-bit floating-point, the pixel values are multiplied by 255. That is, the
value range [0,1] is mapped to [0,255].
If window was created with OpenGL support, imshow also support ogl::Buffer , ogl::Texture2D and
If window was created with OpenGL support, cv::imshow also support ogl::Buffer , ogl::Texture2D and
cuda::GpuMat as input.
If the window was not created before this function, it is assumed creating a window with CV_WINDOW_AUTOSIZE.
If the window was not created before this function, it is assumed creating a window with cv::WINDOW_AUTOSIZE.
If you need to show an image that is bigger than the screen resolution, you will need to call namedWindow("", WINDOW_NORMAL) before the imshow.
@note This function should be followed by waitKey function which displays the image for specified
milliseconds. Otherwise, it won't display the image. For example, waitKey(0) will display the window
infinitely until any keypress (it is suitable for image display). waitKey(25) will display a frame
@note This function should be followed by cv::waitKey function which displays the image for specified
milliseconds. Otherwise, it won't display the image. For example, **waitKey(0)** will display the window
infinitely until any keypress (it is suitable for image display). **waitKey(25)** will display a frame
for 25 ms, after which display will be automatically closed. (If you put it in a loop to read
videos, it will display the video frame-by-frame)
@note
[Windows Backend Only] Pressing Ctrl+C will copy the image to the clipboard.
[__Windows Backend Only__] Pressing Ctrl+C will copy the image to the clipboard.
[__Windows Backend Only__] Pressing Ctrl+S will show a dialog to save the image.
@param winname Name of the window.
@param mat Image to be shown.
*/
CV_EXPORTS_W void imshow(const String& winname, InputArray mat);
/** @brief Resizes window to the specified size
@param winname Window name
@param width The new window width
@param height The new window height
@note
- The specified window size is for the image area. Toolbars are not counted.
- Only windows created without CV_WINDOW_AUTOSIZE flag can be resized.
- Only windows created without cv::WINDOW_AUTOSIZE flag can be resized.
@param winname Window name.
@param width The new window width.
@param height The new window height.
*/
CV_EXPORTS_W void resizeWindow(const String& winname, int width, int height);
/** @overload
@param winname Window name.
@param size The new window size.
*/
CV_EXPORTS_W void resizeWindow(const String& winname, const cv::Size& size);
/** @brief Moves window to the specified position
@param winname Window name
@param x The new x-coordinate of the window
@param y The new y-coordinate of the window
@param winname Name of the window.
@param x The new x-coordinate of the window.
@param y The new y-coordinate of the window.
*/
CV_EXPORTS_W void moveWindow(const String& winname, int x, int y);
/** @brief Changes parameters of a window dynamically.
@param winname Name of the window.
@param prop_id Window property to edit. The following operation flags are available:
- **CV_WND_PROP_FULLSCREEN** Change if the window is fullscreen ( CV_WINDOW_NORMAL or
CV_WINDOW_FULLSCREEN ).
- **CV_WND_PROP_AUTOSIZE** Change if the window is resizable (CV_WINDOW_NORMAL or
CV_WINDOW_AUTOSIZE ).
- **CV_WND_PROP_ASPECTRATIO** Change if the aspect ratio of the image is preserved (
CV_WINDOW_FREERATIO or CV_WINDOW_KEEPRATIO ).
@param prop_value New value of the window property. The following operation flags are available:
- **CV_WINDOW_NORMAL** Change the window to normal size or make the window resizable.
- **CV_WINDOW_AUTOSIZE** Constrain the size by the displayed image. The window is not
resizable.
- **CV_WINDOW_FULLSCREEN** Change the window to fullscreen.
- **CV_WINDOW_FREERATIO** Make the window resizable without any ratio constraints.
- **CV_WINDOW_KEEPRATIO** Make the window resizable, but preserve the proportions of the
displayed image.
The function setWindowProperty enables changing properties of a window.
@param winname Name of the window.
@param prop_id Window property to edit. The supported operation flags are: (cv::WindowPropertyFlags)
@param prop_value New value of the window property. The supported flags are: (cv::WindowFlags)
*/
CV_EXPORTS_W void setWindowProperty(const String& winname, int prop_id, double prop_value);
/** @brief Updates window title
@param winname Name of the window.
@param title New title.
*/
CV_EXPORTS_W void setWindowTitle(const String& winname, const String& title);
/** @brief Provides parameters of a window.
@param winname Name of the window.
@param prop_id Window property to retrieve. The following operation flags are available:
- **CV_WND_PROP_FULLSCREEN** Change if the window is fullscreen ( CV_WINDOW_NORMAL or
CV_WINDOW_FULLSCREEN ).
- **CV_WND_PROP_AUTOSIZE** Change if the window is resizable (CV_WINDOW_NORMAL or
CV_WINDOW_AUTOSIZE ).
- **CV_WND_PROP_ASPECTRATIO** Change if the aspect ratio of the image is preserved
(CV_WINDOW_FREERATIO or CV_WINDOW_KEEPRATIO ).
See setWindowProperty to know the meaning of the returned values.
The function getWindowProperty returns properties of a window.
@param winname Name of the window.
@param prop_id Window property to retrieve. The following operation flags are available: (cv::WindowPropertyFlags)
@sa setWindowProperty
*/
CV_EXPORTS_W double getWindowProperty(const String& winname, int prop_id);
/** @brief Provides rectangle of image in the window.
The function getWindowImageRect returns the client screen coordinates, width and height of the image rendering area.
@param winname Name of the window.
@sa resizeWindow moveWindow
*/
CV_EXPORTS_W Rect getWindowImageRect(const String& winname);
/** @example samples/cpp/create_mask.cpp
This program demonstrates using mouse events and how to make and use a mask image (black and white) .
*/
/** @brief Sets mouse handler for the specified window
@param winname Window name
@param onMouse Mouse callback. See OpenCV samples, such as
<https://github.com/Itseez/opencv/tree/master/samples/cpp/ffilldemo.cpp>, on how to specify and
use the callback.
@param winname Name of the window.
@param onMouse Callback function for mouse events. See OpenCV samples on how to specify and use the callback.
@param userdata The optional parameter passed to the callback.
*/
CV_EXPORTS void setMouseCallback(const String& winname, MouseCallback onMouse, void* userdata = 0);
/** @brief Gets the mouse-wheel motion delta, when handling mouse-wheel events EVENT_MOUSEWHEEL and
EVENT_MOUSEHWHEEL.
@param flags The mouse callback flags parameter.
/** @brief Gets the mouse-wheel motion delta, when handling mouse-wheel events cv::EVENT_MOUSEWHEEL and
cv::EVENT_MOUSEHWHEEL.
For regular mice with a scroll-wheel, delta will be a multiple of 120. The value 120 corresponds to
a one notch rotation of the wheel or the threshold for action to be taken and one such action should
occur for each delta. Some high-precision mice with higher-resolution freely-rotating wheels may
generate smaller values.
For EVENT_MOUSEWHEEL positive and negative values mean forward and backward scrolling,
respectively. For EVENT_MOUSEHWHEEL, where available, positive and negative values mean right and
For cv::EVENT_MOUSEWHEEL positive and negative values mean forward and backward scrolling,
respectively. For cv::EVENT_MOUSEHWHEEL, where available, positive and negative values mean right and
left scrolling, respectively.
With the C API, the macro CV_GET_WHEEL_DELTA(flags) can be used alternatively.
@ -398,11 +480,63 @@ With the C API, the macro CV_GET_WHEEL_DELTA(flags) can be used alternatively.
@note
Mouse-wheel events are currently supported only on Windows.
@param flags The mouse callback flags parameter.
*/
CV_EXPORTS int getMouseWheelDelta(int flags);
/** @brief Selects ROI on the given image.
Function creates a window and allows user to select a ROI using mouse.
Controls: use `space` or `enter` to finish selection, use key `c` to cancel selection (function will return the zero cv::Rect).
@param windowName name of the window where selection process will be shown.
@param img image to select a ROI.
@param showCrosshair if true crosshair of selection rectangle will be shown.
@param fromCenter if true center of selection will match initial mouse position. In opposite case a corner of
selection rectangle will correspont to the initial mouse position.
@return selected ROI or empty rect if selection canceled.
@note The function sets it's own mouse callback for specified window using cv::setMouseCallback(windowName, ...).
After finish of work an empty callback will be set for the used window.
*/
CV_EXPORTS_W Rect selectROI(const String& windowName, InputArray img, bool showCrosshair = true, bool fromCenter = false);
/** @overload
*/
CV_EXPORTS_W Rect selectROI(InputArray img, bool showCrosshair = true, bool fromCenter = false);
/** @brief Selects ROIs on the given image.
Function creates a window and allows user to select a ROIs using mouse.
Controls: use `space` or `enter` to finish current selection and start a new one,
use `esc` to terminate multiple ROI selection process.
@param windowName name of the window where selection process will be shown.
@param img image to select a ROI.
@param boundingBoxes selected ROIs.
@param showCrosshair if true crosshair of selection rectangle will be shown.
@param fromCenter if true center of selection will match initial mouse position. In opposite case a corner of
selection rectangle will correspont to the initial mouse position.
@note The function sets it's own mouse callback for specified window using cv::setMouseCallback(windowName, ...).
After finish of work an empty callback will be set for the used window.
*/
CV_EXPORTS_W void selectROIs(const String& windowName, InputArray img,
CV_OUT std::vector<Rect>& boundingBoxes, bool showCrosshair = true, bool fromCenter = false);
/** @brief Creates a trackbar and attaches it to the specified window.
The function createTrackbar creates a trackbar (a slider or range control) with the specified name
and range, assigns a variable value to be a position synchronized with the trackbar and specifies
the callback function onChange to be called on the trackbar position change. The created trackbar is
displayed in the specified window winname.
@note
[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar should be attached to the
control panel.
Clicking the label of each trackbar enables editing the trackbar values manually.
@param trackbarname Name of the created trackbar.
@param winname Name of the window that will be used as a parent of the created trackbar.
@param value Optional pointer to an integer variable whose value reflects the position of the
@ -414,23 +548,6 @@ position and the second parameter is the user data (see the next parameter). If
the NULL pointer, no callbacks are called, but only value is updated.
@param userdata User data that is passed as is to the callback. It can be used to handle trackbar
events without using global variables.
The function createTrackbar creates a trackbar (a slider or range control) with the specified name
and range, assigns a variable value to be a position synchronized with the trackbar and specifies
the callback function onChange to be called on the trackbar position change. The created trackbar is
displayed in the specified window winname.
@note
**[Qt Backend Only]** winname can be empty (or NULL) if the trackbar should be attached to the
control panel.
Clicking the label of each trackbar enables editing the trackbar values manually.
@note
- An example of using the trackbar functionality can be found at
opencv_source_code/samples/cpp/connected_components.cpp
*/
CV_EXPORTS int createTrackbar(const String& trackbarname, const String& winname,
int* value, int count,
@ -439,63 +556,77 @@ CV_EXPORTS int createTrackbar(const String& trackbarname, const String& winname,
/** @brief Returns the trackbar position.
@param trackbarname Name of the trackbar.
@param winname Name of the window that is the parent of the trackbar.
The function returns the current position of the specified trackbar.
@note
**[Qt Backend Only]** winname can be empty (or NULL) if the trackbar is attached to the control
[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar is attached to the control
panel.
@param trackbarname Name of the trackbar.
@param winname Name of the window that is the parent of the trackbar.
*/
CV_EXPORTS_W int getTrackbarPos(const String& trackbarname, const String& winname);
/** @brief Sets the trackbar position.
@param trackbarname Name of the trackbar.
@param winname Name of the window that is the parent of trackbar.
@param pos New position.
The function sets the position of the specified trackbar in the specified window.
@note
**[Qt Backend Only]** winname can be empty (or NULL) if the trackbar is attached to the control
[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar is attached to the control
panel.
@param trackbarname Name of the trackbar.
@param winname Name of the window that is the parent of trackbar.
@param pos New position.
*/
CV_EXPORTS_W void setTrackbarPos(const String& trackbarname, const String& winname, int pos);
/** @brief Sets the trackbar maximum position.
@param trackbarname Name of the trackbar.
@param winname Name of the window that is the parent of trackbar.
@param maxval New maximum position.
The function sets the maximum position of the specified trackbar in the specified window.
@note
**[Qt Backend Only]** winname can be empty (or NULL) if the trackbar is attached to the control
[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar is attached to the control
panel.
@param trackbarname Name of the trackbar.
@param winname Name of the window that is the parent of trackbar.
@param maxval New maximum position.
*/
CV_EXPORTS_W void setTrackbarMax(const String& trackbarname, const String& winname, int maxval);
/** @brief Sets the trackbar minimum position.
The function sets the minimum position of the specified trackbar in the specified window.
@note
[__Qt Backend Only__] winname can be empty (or NULL) if the trackbar is attached to the control
panel.
@param trackbarname Name of the trackbar.
@param winname Name of the window that is the parent of trackbar.
@param minval New minimum position.
*/
CV_EXPORTS_W void setTrackbarMin(const String& trackbarname, const String& winname, int minval);
//! @addtogroup highgui_opengl OpenGL support
//! @{
/** @brief Displays OpenGL 2D texture in the specified window.
@param winname Name of the window.
@param tex OpenGL 2D texture data.
*/
CV_EXPORTS void imshow(const String& winname, const ogl::Texture2D& tex);
/** @brief Sets a callback function to be called to draw on top of displayed image.
@param winname Name of the window.
@param onOpenGlDraw Pointer to the function to be called every frame. This function should be
prototyped as void Foo(void\*) .
@param userdata Pointer passed to the callback function. *(Optional)*
The function setOpenGlDrawCallback can be used to draw 3D data on the window. See the example of
callback function below: :
callback function below:
@code
void on_opengl(void* param)
{
@ -526,18 +657,23 @@ callback function below: :
}
}
@endcode
@param winname Name of the window.
@param onOpenGlDraw Pointer to the function to be called every frame. This function should be
prototyped as void Foo(void\*) .
@param userdata Pointer passed to the callback function.(__Optional__)
*/
CV_EXPORTS void setOpenGlDrawCallback(const String& winname, OpenGlDrawCallback onOpenGlDraw, void* userdata = 0);
/** @brief Sets the specified window as current OpenGL context.
@param winname Window name
@param winname Name of the window.
*/
CV_EXPORTS void setOpenGlContext(const String& winname);
/** @brief Force window to redraw its context and call draw callback ( setOpenGlDrawCallback ).
/** @brief Force window to redraw its context and call draw callback ( See cv::setOpenGlDrawCallback ).
@param winname Window name
@param winname Name of the window.
*/
CV_EXPORTS void updateWindow(const String& winname);
@ -545,112 +681,120 @@ CV_EXPORTS void updateWindow(const String& winname);
//! @addtogroup highgui_qt
//! @{
// Only for Qt
/** @brief QtFont available only for Qt. See cv::fontQt
*/
struct QtFont
{
const char* nameFont; // Qt: nameFont
Scalar color; // Qt: ColorFont -> cvScalar(blue_component, green_component, red_component[, alpha_component])
int font_face; // Qt: bool italic
const int* ascii; // font data and metrics
const char* nameFont; //!< Name of the font
Scalar color; //!< Color of the font. Scalar(blue_component, green_component, red_component[, alpha_component])
int font_face; //!< See cv::QtFontStyles
const int* ascii; //!< font data and metrics
const int* greek;
const int* cyrillic;
float hscale, vscale;
float shear; // slope coefficient: 0 - normal, >0 - italic
int thickness; // Qt: weight
float dx; // horizontal interval between letters
int line_type; // Qt: PointSize
float shear; //!< slope coefficient: 0 - normal, >0 - italic
int thickness; //!< See cv::QtFontWeights
float dx; //!< horizontal interval between letters
int line_type; //!< PointSize
};
/** @brief Creates the font to draw a text on an image.
The function fontQt creates a cv::QtFont object. This cv::QtFont is not compatible with putText .
A basic usage of this function is the following: :
@code
QtFont font = fontQt("Times");
addText( img1, "Hello World !", Point(50,50), font);
@endcode
@param nameFont Name of the font. The name should match the name of a system font (such as
*Times*). If the font is not found, a default one is used.
@param pointSize Size of the font. If not specified, equal zero or negative, the point size of the
font is set to a system-dependent default value. Generally, this is 12 points.
@param color Color of the font in BGRA where A = 255 is fully transparent. Use the macro CV _ RGB
@param color Color of the font in BGRA where A = 255 is fully transparent. Use the macro CV_RGB
for simplicity.
@param weight Font weight. The following operation flags are available:
- **CV_FONT_LIGHT** Weight of 25
- **CV_FONT_NORMAL** Weight of 50
- **CV_FONT_DEMIBOLD** Weight of 63
- **CV_FONT_BOLD** Weight of 75
- **CV_FONT_BLACK** Weight of 87
You can also specify a positive integer for better control.
@param style Font style. The following operation flags are available:
- **CV_STYLE_NORMAL** Normal font
- **CV_STYLE_ITALIC** Italic font
- **CV_STYLE_OBLIQUE** Oblique font
@param weight Font weight. Available operation flags are : cv::QtFontWeights You can also specify a positive integer for better control.
@param style Font style. Available operation flags are : cv::QtFontStyles
@param spacing Spacing between characters. It can be negative or positive.
The function fontQt creates a CvFont object. This CvFont is not compatible with putText .
A basic usage of this function is the following: :
@code
CvFont font = fontQt(''Times'');
addText( img1, ``Hello World !'', Point(50,50), font);
@endcode
*/
CV_EXPORTS QtFont fontQt(const String& nameFont, int pointSize = -1,
Scalar color = Scalar::all(0), int weight = QT_FONT_NORMAL,
int style = QT_STYLE_NORMAL, int spacing = 0);
/** @brief Creates the font to draw a text on an image.
/** @brief Draws a text on the image.
The function addText draws *text* on the image *img* using a specific font *font* (see example cv::fontQt
)
@param img 8-bit 3-channel image where the text should be drawn.
@param text Text to write on an image.
@param org Point(x,y) where the text should start on an image.
@param font Font to use to draw a text.
The function addText draws *text* on an image *img* using a specific font *font* (see example fontQt
)
*/
CV_EXPORTS void addText( const Mat& img, const String& text, Point org, const QtFont& font);
/** @brief Draws a text on the image.
@param img 8-bit 3-channel image where the text should be drawn.
@param text Text to write on an image.
@param org Point(x,y) where the text should start on an image.
@param nameFont Name of the font. The name should match the name of a system font (such as
*Times*). If the font is not found, a default one is used.
@param pointSize Size of the font. If not specified, equal zero or negative, the point size of the
font is set to a system-dependent default value. Generally, this is 12 points.
@param color Color of the font in BGRA where A = 255 is fully transparent.
@param weight Font weight. Available operation flags are : cv::QtFontWeights You can also specify a positive integer for better control.
@param style Font style. Available operation flags are : cv::QtFontStyles
@param spacing Spacing between characters. It can be negative or positive.
*/
CV_EXPORTS_W void addText(const Mat& img, const String& text, Point org, const String& nameFont, int pointSize = -1, Scalar color = Scalar::all(0),
int weight = QT_FONT_NORMAL, int style = QT_STYLE_NORMAL, int spacing = 0);
/** @brief Displays a text on a window image as an overlay for a specified duration.
The function displayOverlay displays useful information/tips on top of the window for a certain
amount of time *delayms*. The function does not modify the image, displayed in the window, that is,
after the specified delay the original content of the window is restored.
@param winname Name of the window.
@param text Overlay text to write on a window image.
@param delayms The period (in milliseconds), during which the overlay text is displayed. If this
function is called before the previous overlay text timed out, the timer is restarted and the text
is updated. If this value is zero, the text never disappears.
The function displayOverlay displays useful information/tips on top of the window for a certain
amount of time *delayms*. The function does not modify the image, displayed in the window, that is,
after the specified delay the original content of the window is restored.
*/
CV_EXPORTS void displayOverlay(const String& winname, const String& text, int delayms = 0);
CV_EXPORTS_W void displayOverlay(const String& winname, const String& text, int delayms = 0);
/** @brief Displays a text on the window statusbar during the specified period of time.
The function displayStatusBar displays useful information/tips on top of the window for a certain
amount of time *delayms* . This information is displayed on the window statusbar (the window must be
created with the CV_GUI_EXPANDED flags).
@param winname Name of the window.
@param text Text to write on the window statusbar.
@param delayms Duration (in milliseconds) to display the text. If this function is called before
the previous text timed out, the timer is restarted and the text is updated. If this value is
zero, the text never disappears.
The function displayOverlay displays useful information/tips on top of the window for a certain
amount of time *delayms* . This information is displayed on the window statusbar (the window must be
created with the CV_GUI_EXPANDED flags).
*/
CV_EXPORTS void displayStatusBar(const String& winname, const String& text, int delayms = 0);
CV_EXPORTS_W void displayStatusBar(const String& winname, const String& text, int delayms = 0);
/** @brief Saves parameters of the specified window.
@param windowName Name of the window.
The function saveWindowParameters saves size, location, flags, trackbars value, zoom and panning
location of the window window_name .
location of the window windowName.
@param windowName Name of the window.
*/
CV_EXPORTS void saveWindowParameters(const String& windowName);
/** @brief Loads parameters of the specified window.
@param windowName Name of the window.
The function loadWindowParameters loads size, location, flags, trackbars value, zoom and panning
location of the window window_name .
location of the window windowName.
@param windowName Name of the window.
*/
CV_EXPORTS void loadWindowParameters(const String& windowName);
@ -660,32 +804,29 @@ CV_EXPORTS void stopLoop();
/** @brief Attaches a button to the control panel.
@param bar_name
Name of the button.
The function createButton attaches a button to the control panel. Each button is added to a
buttonbar to the right of the last button. A new buttonbar is created if nothing was attached to the
control panel before, or if the last element attached to the control panel was a trackbar or if the
QT_NEW_BUTTONBAR flag is added to the type.
See below various examples of the cv::createButton function call: :
@code
createButton(NULL,callbackButton);//create a push button "button 0", that will call callbackButton.
createButton("button2",callbackButton,NULL,QT_CHECKBOX,0);
createButton("button3",callbackButton,&value);
createButton("button5",callbackButton1,NULL,QT_RADIOBOX);
createButton("button6",callbackButton2,NULL,QT_PUSH_BUTTON,1);
createButton("button6",callbackButton2,NULL,QT_PUSH_BUTTON|QT_NEW_BUTTONBAR);// create a push button in a new row
@endcode
@param bar_name Name of the button.
@param on_change Pointer to the function to be called every time the button changes its state.
This function should be prototyped as void Foo(int state,\*void); . *state* is the current state
of the button. It could be -1 for a push button, 0 or 1 for a check/radio box button.
@param userdata Pointer passed to the callback function.
@param type Optional type of the button.
- **CV_PUSH_BUTTON** Push button
- **CV_CHECKBOX** Checkbox button
- **CV_RADIOBOX** Radiobox button. The radiobox on the same buttonbar (same line) are
exclusive, that is only one can be selected at a time.
@param type Optional type of the button. Available types are: (cv::QtButtonTypes)
@param initial_button_state Default state of the button. Use for checkbox and radiobox. Its
value could be 0 or 1. *(Optional)*
The function createButton attaches a button to the control panel. Each button is added to a
buttonbar to the right of the last button. A new buttonbar is created if nothing was attached to the
control panel before, or if the last element attached to the control panel was a trackbar.
See below various examples of the createButton function call: :
@code
createButton(NULL,callbackButton);//create a push button "button 0", that will call callbackButton.
createButton("button2",callbackButton,NULL,CV_CHECKBOX,0);
createButton("button3",callbackButton,&value);
createButton("button5",callbackButton1,NULL,CV_RADIOBOX);
createButton("button6",callbackButton2,NULL,CV_PUSH_BUTTON,1);
@endcode
value could be 0 or 1. (__Optional__)
*/
CV_EXPORTS int createButton( const String& bar_name, ButtonCallback on_change,
void* userdata = 0, int type = QT_PUSH_BUTTON,