《学习OpenCV》练习题第三章第四题

#include <highgui.h> 2 #include <cv.h> 3 #include <stdio.h> 4  5 #pragma comment (lib,"opencv_calib3d231d.lib") 6 #pragma comment (lib,"opencv_contrib231d.lib") 7 #pragma comment (lib,"opencv_core231d.lib") 8 #pragma comment (lib,"opencv_features2d231d.lib") 9 #pragma comment (lib,"opencv_flann231d.lib")10 #pragma comment (lib,"opencv_gpu231d.lib")11 #pragma comment (lib,"opencv_haartraining_engined.lib")12 #pragma comment (lib,"opencv_highgui231d.lib")13 #pragma comment (lib,"opencv_imgproc231d.lib")14 #pragma comment (lib,"opencv_legacy231d.lib")15 #pragma comment (lib,"opencv_ml231d.lib")16 #pragma comment (lib,"opencv_objdetect231d.lib")17 #pragma comment (lib,"opencv_ts231d.lib")18 #pragma comment (lib,"opencv_video231d.lib")19 20 /*21  *《学习OpenCV》第三章第四题22  * 完成时间：2:13 3/2 星期六 201323  */24 25 // 图像宽高宏定义26 #define IMG_WIDTH  40027 #define IMG_HEIGHT 40028 29 // 两个顶点 30 CvPoint point1 = cvPoint(80, 20);31 CvPoint point2 = cvPoint(160, 80);32 33 // Help function34 // 检查当前点是否在要画的长方形区域内35 bool isThePointInRectangle(int x, int y)36 {37     if( (x <= point2.x) && (y <= point2.y) 38         & (x >= point1.x) && (y >= point1.y))39         return true;40     else 41         return false;42 }43 44 45 int main()46 {47     // 创建一个三通道RGB图像48     IplImage* image = cvCreateImage(cvSize(IMG_WIDTH, IMG_HEIGHT), 8, 3 );49     50     // 将矩阵元素全部置零51     cvZero(image);52     uchar* p;53     for(int i = 0; i < image->height; i++)54     {55         for(int j = 0; j < image->width; j++)56         {57             p = cvPtr2D(image, i, j, 0);58             if(isThePointInRectangle(i, j) == true)59             {60                 *(++p) = 255;61             }62         }63     }64     cvNamedWindow("img", 1);65     cvShowImage("img", image);66     cvWaitKey(0);67 68     cvReleaseImage(&image);69     cvDestroyWindow("img");70 71     return 0; 72 }

运行结果：