I’ve been working with OpenCV and iOS development quite a bit recently and this is a handy function for getting an Apple-friendly UIImage from the C++ OpenCV class cv::Mat. Here you go:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | - (UIImage *)UIImageFromMat:(cv::Mat)image { NSData *data = [NSData dataWithBytes:image.data length:image.elemSize()*image.total()]; CGColorSpaceRef colorSpace; if (image.elemSize() == 1) { colorSpace = CGColorSpaceCreateDeviceGray(); } else { colorSpace = CGColorSpaceCreateDeviceRGB(); } CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data); // Creating CGImage from cv::Mat CGImageRef imageRef = CGImageCreate(image.cols, //width image.rows, //height 8, //bits per component 8 * image.elemSize(), //bits per pixel image.step.p[0], //bytesPerRow colorSpace, //colorspace kCGImageAlphaNone|kCGBitmapByteOrderDefault,// bitmap info provider, //CGDataProviderRef NULL, //decode false, //should interpolate kCGRenderingIntentDefault //intent ); // Getting UIImage from CGImage UIImage *finalImage = [UIImage imageWithCGImage:imageRef]; CGImageRelease(imageRef); CGDataProviderRelease(provider); CGColorSpaceRelease(colorSpace); return finalImage; } |