IMAGE NOISE MEASUREMENT SYSTEM AND METHOD

An image noise measurement system performs a noise estimation on a current image. A storage device stores a previous image. A noise estimator performs a noise estimation on sub-areas of the current image and the previous image to thereby produce a noise estimation index for the sub-area of the current image. A distribution calculator calculates a distribution of positive and negative signs of pixel differences in the sub-areas of the current image and the previous image to thereby output a positive sign number and a negative sign number. A confidence generator produces a confident level index according to the positive sign number and the negative sign number. A recursive filter performs a recursive filtering operation on the noise estimation index according to the confident level index to thereby produce a noise estimate for the current image.