openCV（三）---图像缩放

UIImage *img1 = [UIImage imageNamed:@"1448941176867"];

//将UIImage转换为IplImage格式

IplImage *pimage = [self convertToIplImage:img1];

//缩放图片

//比例值

float fScale = 0.4;

CvSize cvsize;

cvsize.width = pimage->width * fScale;

cvsize.height = pimage ->height * fScale;

//创建输出图像

IplImage *outImage = cvCreateImage(cvsize, pimage->depth, pimage->nChannels);

//缩放图像

cvResize(pimage, outImage);

//将IplImage图像转换为UIImage

UIImage *img = [self convertToUIImage:outImage];

self.imgView.image = img;

//释放图片内存

cvReleaseImage(&pimage);

cvReleaseImage(&outImage);

关于UIImage和IplImage的相互转换，参考我的另一个随笔

http://www.cnblogs.com/iOSDeng/p/5081588.html