How to resize an image to a specific size in OpenCV?

Question

IplImage* img = cvLoadImage(\"something.jpg\");
IplImage* src = cvLoadImage(\"src.jpg\");
cvSub(src, img, img);

But the size of the source image is

Answer 1

You can use cvResize. Or better use c++ interface (eg cv::Mat instead of IplImage and cv::imread instead of cvLoadImage) and then use cv::resize which handles memory allocation and deallocation itself.