learning OpenCV(4)

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我是靠谱客的博主花痴大叔，这篇文章主要介绍learning OpenCV(4)，现在分享给大家，希望可以做个参考。

High GUI定义与操作系统，文件系统和摄像机之类的硬件进行交互的一些函数

High GUI组成

· 硬件相关部分摄像机的操作

· 文件相关部分载入和保存图像文件

· 图形用户界面部分窗口系统，加入鼠标，键盘响应，滑动条

窗口

创建窗口： int cvNamedWindow(char* name, int flags); flags = 1 不能随意调整窗口大小， falgs = 0，可以随意调整窗口大小

销毁窗口：cvDestroyWindow(char* name);

获得窗口句柄： void* cvGetWindowHandle(const char* name);

获得窗口名： const char* cvGetWindowName(void * window_handle);

调整窗口大小： void cvResizeWindow(char* name, int width, int height);

图像

载入图像：IplImage* cvLoadImage(char* fileame, int iscolor = CV_LOAD_IMAGE_COLOR); 默认每个通道8位，3个通道的形式读入；也可以设为CV_LOAD_IMAGE_GRAYSCALE, CV_LOAD_IMAGE_ANYCOLOR(保持原图像通道数的方式读入）如16为图像，设为CV_LOAD_IMAGE_UNCHANGED;如果读入失败，返回空指针。

保存图像： int cvSaveImage(char* filename, CvArr * image); 保存成功返回1，否则返回0

显示图像： void cvShowImage(char * name, CvArr* image);

其他一些相关函数：void cvMoveWindow(char* name, int x, int y);

void cvDestroyAllWindow();

int cvStartWindowThread(); //返回0表示没有创建出线程

鼠标

void CvMouseCallback(int event, int x, int y, int flags, void* param);

注册回调函数到OpenCV中，void cvSetMouseCallback(char* window_name, CvMouseCallback on_mouse, void* param = NULL);

鼠标响应范例：画矩形-----

复制代码

// An example program in which the
// user can draw boxes on the screen.
//
/* License:
Oct. 3, 2008
Right to use this code in any way you want without warrenty, support or any guarentee of it working.
BOOK: It would be nice if you cited it:
Learning OpenCV: Computer Vision with the OpenCV Library
by Gary Bradski and Adrian Kaehler
Published by O'Reilly Media, October 3, 2008
AVAILABLE AT:
http://www.amazon.com/Learning-OpenCV-Computer-Vision-Library/dp/0596516134
Or: http://oreilly.com/catalog/9780596516130/
ISBN-10: 0596516134 or: ISBN-13: 978-0596516130
OTHER OPENCV SITES:
* The source code is on sourceforge at:
http://sourceforge.net/projects/opencvlibrary/
* The OpenCV wiki page (As of Oct 1, 2008 this is down for changing over servers, but should come back):
http://opencvlibrary.sourceforge.net/
* An active user group is at:
http://tech.groups.yahoo.com/group/OpenCV/
* The minutes of weekly OpenCV development meetings are at:
http://pr.willowgarage.com/wiki/OpenCV
*/
#include <cv.h>
#include <highgui.h>
// Define our callback which we will install for
// mouse events.
//
void my_mouse_callback(
int event, int x, int y, int flags, void* param
);
CvRect box;
bool drawing_box = false;
// A litte subroutine to draw a box onto an image
//
void draw_box( IplImage* img, CvRect rect ) {
cvRectangle (
img,
cvPoint(box.x,box.y),
cvPoint(box.x+box.width,box.y+box.height),
cvScalar(0xff,0x00,0x00)
/* red */
);
}
int main( int argc, char* argv[] ) {
box = cvRect(-1,-1,0,0);
IplImage* image = cvCreateImage(
cvSize(200,200),
IPL_DEPTH_8U,
3
);
cvZero( image );
IplImage* temp = cvCloneImage( image );
cvNamedWindow( "Box Example" );
// Here is the crucial moment that we actually install
// the callback.
Note that we set the value ‘param’ to
// be the image we are working with so that the callback
// will have the image to edit.
//
cvSetMouseCallback(
"Box Example",
my_mouse_callback,
(void*) image
);
// The main program loop.
Here we copy the working image
// to the ‘temp’ image, and if the user is drawing, then
// put the currently contemplated box onto that temp image.
// display the temp image, and wait 15ms for a keystroke,
// then repeat…
//
while( 1 ) {
cvCopyImage( image, temp );
if( drawing_box ) draw_box( temp, box );
cvShowImage( "Box Example", temp );
if( cvWaitKey( 15 )==27 ) break;
}
// Be tidy
//
cvReleaseImage( &image );
cvReleaseImage( &temp );
cvDestroyWindow( "Box Example" );
}
// This is our mouse callback.
If the user
// presses the left button, we start a box.
// when the user releases that button, then we
// add the box to the current image.
When the
// mouse is dragged (with the button down) we
// resize the box.
//
void my_mouse_callback(
int event, int x, int y, int flags, void* param )
{
IplImage* image = (IplImage*) param;
switch( event ) {
case CV_EVENT_MOUSEMOVE: {
if( drawing_box ) {
box.width
= x-box.x;
box.height = y-box.y;
}
}
break;
case CV_EVENT_LBUTTONDOWN: {
drawing_box = true;
box = cvRect( x, y, 0, 0 );
}
break;
case CV_EVENT_LBUTTONUP: {
drawing_box = false;
if( box.width<0
) {
box.x+=box.width;
box.width *=-1;
}
if( box.height<0 ) {
box.y+=box.height;
box.height*=-1;
}
draw_box( image, box );
}
break;
}
}

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// An example program in which the
// user can draw boxes on the screen.
//
/* License:
Oct. 3, 2008
Right to use this code in any way you want without warrenty, support or any guarentee of it working.
BOOK: It would be nice if you cited it:
Learning OpenCV: Computer Vision with the OpenCV Library
by Gary Bradski and Adrian Kaehler
Published by O'Reilly Media, October 3, 2008
AVAILABLE AT:
http://www.amazon.com/Learning-OpenCV-Computer-Vision-Library/dp/0596516134
Or: http://oreilly.com/catalog/9780596516130/
ISBN-10: 0596516134 or: ISBN-13: 978-0596516130
OTHER OPENCV SITES:
* The source code is on sourceforge at:
http://sourceforge.net/projects/opencvlibrary/
* The OpenCV wiki page (As of Oct 1, 2008 this is down for changing over servers, but should come back):
http://opencvlibrary.sourceforge.net/
* An active user group is at:
http://tech.groups.yahoo.com/group/OpenCV/
* The minutes of weekly OpenCV development meetings are at:
http://pr.willowgarage.com/wiki/OpenCV
*/
#include <cv.h>
#include <highgui.h>
// Define our callback which we will install for
// mouse events.
//
void my_mouse_callback(
int event, int x, int y, int flags, void* param
);
CvRect box;
bool drawing_box = false;
// A litte subroutine to draw a box onto an image
//
void draw_box( IplImage* img, CvRect rect ) {
cvRectangle (
img,
cvPoint(box.x,box.y),
cvPoint(box.x+box.width,box.y+box.height),
cvScalar(0xff,0x00,0x00)
/* red */
);
}
int main( int argc, char* argv[] ) {
box = cvRect(-1,-1,0,0);
IplImage* image = cvCreateImage(
cvSize(200,200),
IPL_DEPTH_8U,
3
);
cvZero( image );
IplImage* temp = cvCloneImage( image );
cvNamedWindow( "Box Example" );
// Here is the crucial moment that we actually install
// the callback.
Note that we set the value ‘param’ to
// be the image we are working with so that the callback
// will have the image to edit.
//
cvSetMouseCallback(
"Box Example",
my_mouse_callback,
(void*) image
);
// The main program loop.
Here we copy the working image
// to the ‘temp’ image, and if the user is drawing, then
// put the currently contemplated box onto that temp image.
// display the temp image, and wait 15ms for a keystroke,
// then repeat…
//
while( 1 ) {
cvCopyImage( image, temp );
if( drawing_box ) draw_box( temp, box );
cvShowImage( "Box Example", temp );
if( cvWaitKey( 15 )==27 ) break;
}
// Be tidy
//
cvReleaseImage( &image );
cvReleaseImage( &temp );
cvDestroyWindow( "Box Example" );
}
// This is our mouse callback.
If the user
// presses the left button, we start a box.
// when the user releases that button, then we
// add the box to the current image.
When the
// mouse is dragged (with the button down) we
// resize the box.
//
void my_mouse_callback(
int event, int x, int y, int flags, void* param )
{
IplImage* image = (IplImage*) param;
switch( event ) {
case CV_EVENT_MOUSEMOVE: {
if( drawing_box ) {
box.width
= x-box.x;
box.height = y-box.y;
}
}
break;
case CV_EVENT_LBUTTONDOWN: {
drawing_box = true;
box = cvRect( x, y, 0, 0 );
}
break;
case CV_EVENT_LBUTTONUP: {
drawing_box = false;
if( box.width<0
) {
box.x+=box.width;
box.width *=-1;
}
if( box.height<0 ) {
box.y+=box.height;
box.height*=-1;
}
draw_box( image, box );
}
break;
}
}