Apparatus and method of measuring noise in a video signal

Details Apparatus and method of measuring noise in a video signal Apparatus and method of measuring noise in a video signal

2004-11-12

2008-09-23

Ishrat, Sherali (Department: 2624)

Image analysis

Image enhancement or restoration

C382S236000

Reexamination Certificate

active

07428343

ABSTRACT:
An apparatus and method of measuring noise in video signals includes a high-frequency component determination part that detects a high-frequency component value of a first image to measure noise in a blockwise unit, a spatial filter that filters the first image in the blockwise unit, by applying different filtering methods according to the high frequency component value, and outputting the filtered image as a second image, a motion compensation error determination part that determines a presence of a motion compensation error by comparing a first difference between corresponding pixel values of the first image and the second image with a second difference between corresponding pixel values of the first image and a third image which is motion-compensated image derived from the first image, and a noise calculator that measures noise with reference to the second difference between the corresponding pixel values of the first image and the third image for pixels determined by the motion compensation error determination part to have no motion compensation error.

REFERENCES:
patent: 6169583 (2001-01-01), Merkl et al.
patent: 6285710 (2001-09-01), Hurst
patent: 6359658 (2002-03-01), He
patent: 10-056656 (1998-02-01), None
patent: 2001-038014 (2001-05-01), None

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