NSImage to cv::Mat and vice versa

Question

while working with OpenCV I need to convert a NSImage to an OpenCV multi-channel 2D matrix (cvMat) and vice versa.

What\'s the best way to do it?

Greets,

Answer 1

In -(id)initWithCVMat:(const cv::Mat&)cvMat, shouldn't you be adding the representation to self, rather than a new NSImage?

-(id)initWithCVMat:(const cv::Mat *)iMat
{
    if(self = [super init]) {
        NSData *tData = [NSData dataWithBytes:iMat->data length:iMat->elemSize() * iMat->total()];

        CGColorSpaceRef tColorSpace;

        if(iMat->elemSize() == 1) {
            tColorSpace = CGColorSpaceCreateDeviceGray();
        } else {
            tColorSpace = CGColorSpaceCreateDeviceRGB();
        }

        CGDataProviderRef tProvider = CGDataProviderCreateWithCFData((CFDataRef) tData);

        CGImageRef tImage = CGImageCreate(
            iMat->cols,
            iMat->rows,
            8,
            8 * iMat->elemSize(),
            iMat->step[0],
            tColorSpace,
            kCGImageAlphaNone | kCGBitmapByteOrderDefault,
            tProvider,
            NULL,
            false,
            kCGRenderingIntentDefault);

        NSBitmapImageRep *tBitmap = [[NSBitmapImageRep alloc] initWithCGImage:tImage];
        [self addRepresentation:tBitmap];
        [tBitmap release];

        CGImageRelease(tImage);
        CGDataProviderRelease(tProvider);
        CGColorSpaceRelease(tColorSpace);
    }
    return self;
}