[ios] Crop image to specified size and picture location

I have an image that is being taken using AVCaptureSession and being returned to my view controller.

Here is a screen shot of the camera interface:

enter image description here

The AVCaptureSession takes the FULL SCREEN photo, and now I want to crop it down to the size of the visible window above.

The window will always be at the same location and the same size.

Height = 360 (180 non retina)px, Width = 640 (320 non retina)px, x = 0, y = 160.

How can I crop the image down to these coordinates so that the image itself is now 360 x 640?

Any help would be great, thanks!

This question is related to ios uiimage crop avcapturesession

The answer is

You would need to do something like this. I am typing this off the top of my head, so this may not be 100% correct.

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, 640, 360, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedFirst); CGColorSpaceRelease(colorSpace);  CGContextDrawImage(context, CGRectMake(0,-160,640,360), cgImgFromAVCaptureSession);  CGImageRef image = CGBitmapContextCreateImage(context); UIImage* myCroppedImg = [UIImage imageWithCGImage:image]; CGContextRelease(context);       

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