opencv下实现的图像缩放和旋转

// imageScale.cpp : Defines the entry point for the console application. // #include<stdlib.h>; #include<cv.h>; #include<highgui.h>; #include<math.h>; //图像变量 IplImage * src = 0; int angle = 0; void trackbarHandlerScale(int); void trackbarHandlerRotate(int); //图像缩放函数 void cvScale(IplImage*,int); //图像旋转函数 void cvRotate(IplImage* ,int); int main(int argc, char* argv[]) { //滑动条变量 int trackbarVal=10; int maxVal=100; //加载图像 src=cvLoadImage("1.jpg"); if(!src) printf("加载图片失败！\n"); //////////////////////////////////// //创建窗口 cvNamedWindow("src",1); cvMoveWindow("src",200,80); ///////////////////////////////////////// //创建scale滑动条 cvCreateTrackbar("scale", "src", &trackbarVal ,maxVal , trackbarHandlerScale); int pos = cvGetTrackbarPos("scale","src"); cvSetTrackbarPos("scale", "src", 50); //创建rotation滑动条 cvCreateTrackbar("rotate", "src", &trackbarVal ,maxVal , trackbarHandlerRotate); int pos2 = cvGetTrackbarPos("rotate","src"); cvSetTrackbarPos("rotate", "src", 50); /////////////////////////////////////////////////////////////////////// cvWaitKey(0); cvReleaseImage(&src); cvDestroyWindow("src"); return 0; } void trackbarHandlerScale(int pos) { cvScale(src,pos); } void trackbarHandlerRotate(int pos) { angle = (int)(angle + (pos-50))%360; cvRotate(src, angle); } void cvScale(IplImage* src,int scale) { IplImage * dst = 0; CvSize dst_size; dst_size.width = src->width *((float)scale/50.0); dst_size.height = src->height * ((float)dst_size.width/src->width); dst = cvCreateImage( dst_size, src->depth, src->nChannels); cvResize(src, dst, CV_INTER_LINEAR); cvShowImage( "src", dst ); cvReleaseImage(&dst); } void cvRotate(IplImage* src,int angle) { IplImage * dst = 0; dst = cvCloneImage (src); double delte = 1.0; double factor = 1.0; float m[6]; //factor = (cos(angle*CV_PI/180.) + 1.1)*3; CvMat M = cvMat( 2, 3, CV_32F, m ); int w = src->width; int h = src->height; m[0] = (float)(factor*cos(-angle*2*CV_PI/180.)); m[1] = (float)(factor*sin(-angle*2*CV_PI/180.)); m[2] = w*0.5f; m[3] = -m[1]; m[4] = m[0]; m[5] = h*0.5f; cvZero (dst); cvGetQuadrangleSubPix( src, dst, &M); cvShowImage( "src", dst ); cvReleaseImage(&dst); }