opencv动态显示图像像素值

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也比较简单，参考了网上的代码：

#include "cv.h"#include "highgui.h"void mouseHandler(int event, int x, int y, int flags, void* param){    IplImage* img0, * img1;    CvFont    font;    uchar*    ptr;    char      label[20];     img0 = (IplImage*) param;    img1 = cvCloneImage(img0);     cvInitFont(&font, CV_FONT_HERSHEY_PLAIN, .8, .8, 0, 1, 8);     if (event == CV_EVENT_LBUTTONDOWN)    {        /* 读取像素 */        ptr = cvPtr2D(img1, y, x, NULL);         /*         * 显示像素值，注意是BGR         */        sprintf(label, "(%d, %d, %d)", ptr[0], ptr[1], ptr[2]);         cvRectangle(            img1,            cvPoint(x, y - 12),            cvPoint(x + 100, y + 4),            CV_RGB(255, 0, 0),            CV_FILLED,            8, 0        );         cvPutText(            img1,            label,            cvPoint(x, y),            &font,            CV_RGB(255, 255, 0)        );         cvShowImage("img", img1);    }} int main(){    IplImage* img  = cvLoadImage("E:\\分类数据1\\5273-分类1.bmp", 1);     /* always check */    assert(img);     /* create a window and install mouse handler */    cvNamedWindow("img", 1);    cvSetMouseCallback("img", mouseHandler, (void*)img);     cvShowImage("img", img);     cvWaitKey(0);     /* be tidy */    cvDestroyAllWindows();    cvReleaseImage(&img);     return 0;}