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warpPerspective errors if do it separately by channels

I am making a project on a camerawhich the algorithm will get 4 points to warp the license plate . Since the chip make the image like RRR....GGGG...BBB..., I do the warp separately by channels then combine it together. the result is correct if the license plate is not moving,but if it is moving there will be lines on the image with blue or yellow colors like aliasing happens.So could anyone tell me why the pixel values affect the result of the warp function like it does something like median filter and tell me where can I get the source code of the warp function?