Image noise measurement system and method

Details Image noise measurement system and method Image noise measurement system and method

2008-04-29

2011-11-22

Pendleton, Brian (Department: 2425)

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

C348S701000, C382S275000

Reexamination Certificate

active

08063993

ABSTRACT:
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.

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