coreimage-colorAbsoluteDifference.swift

func computeImageDifference(){
        guard let inputImage = UIImage(named: input1)
        else { return }
        
        guard let inputImage2 = UIImage(named: input2)
        else { return }
        
        let beginImage = CIImage(image: inputImage)
        let beginImage2 = CIImage(image: inputImage2)
        let context = CIContext()
        let currentFilter = CIFilter.colorAbsoluteDifference()
        currentFilter.inputImage = beginImage
        currentFilter.inputImage2 = beginImage2
        
        guard let outputImage = currentFilter.outputImage
        else {return }
        if let cgimg = context.createCGImage(outputImage, from: outputImage.extent) {
            let uiImage = UIImage(cgImage: cgimg)
            self.image = uiImage
        }
}