《学习OpenCV》练习题第三章第四题

#include <highgui.h>#include <cv.h>#include <stdio.h>#pragma comment (lib,"opencv_calib3d231d.lib")#pragma comment (lib,"opencv_contrib231d.lib")#pragma comment (lib,"opencv_core231d.lib")#pragma comment (lib,"opencv_features2d231d.lib")#pragma comment (lib,"opencv_flann231d.lib")#pragma comment (lib,"opencv_gpu231d.lib")#pragma comment (lib,"opencv_haartraining_engined.lib")#pragma comment (lib,"opencv_highgui231d.lib")#pragma comment (lib,"opencv_imgproc231d.lib")#pragma comment (lib,"opencv_legacy231d.lib")#pragma comment (lib,"opencv_ml231d.lib")#pragma comment (lib,"opencv_objdetect231d.lib")#pragma comment (lib,"opencv_ts231d.lib")#pragma comment (lib,"opencv_video231d.lib")/* *《学习OpenCV》第三章第四题 * 完成时间：2:13 3/2 星期六 2013 */// 图像宽高宏定义#define IMG_WIDTH  400#define IMG_HEIGHT 400// 两个顶点 CvPoint point1 = cvPoint(80, 20);CvPoint point2 = cvPoint(160, 80);// Help function// 检查当前点是否在要画的长方形区域内bool isThePointInRectangle(int x, int y){if( (x <= point2.x) && (y <= point2.y) & (x >= point1.x) && (y >= point1.y))return true;else return false;}int main(){// 创建一个三通道RGB图像IplImage* image = cvCreateImage(cvSize(IMG_WIDTH, IMG_HEIGHT), 8, 3 );// 将矩阵元素全部置零cvZero(image);uchar* p;for(int i = 0; i < image->height; i++){for(int j = 0; j < image->width; j++){    p = cvPtr2D(image, i, j, 0);if(isThePointInRectangle(i, j) == true){*(++p) = 255;}}}cvNamedWindow("img", 1);cvShowImage("img", image);cvWaitKey(0);cvReleaseImage(&image);cvDestroyWindow("img");return 0; }

运行结果：