How do I perform a fast pixellation filter on an image?

Question

I have a little problem with my pixellation image processing algorithm.

I load the image from the beginning into an array of type unsigned char* After t

Answer 1

Actually, it's simple as this. Higher input scale key means more pixellation.

let filter = CIFilter(name: "CIPixellate")
filter?.setValue(inputImage, forKey: kCIInputImageKey)
filter?.setValue(30, forKey: kCIInputScaleKey)

let pixellatedCIImage = filter?.outputImage

The result is CIImage, you can convert it using UIImage using

UIImage(ciImage: pixellatedCIImage)