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US 7,002,636 B2Granted
Video signal contour corrector
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYuichi Ishikawa, Mitsuaki Shinba
Life of this patent
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Abstract
A gray scale correction unit intended to provide a gray scale correction unit for preventing aliasing-like noise generation and gray-scale degradation of a gradation portion adaptively controls a correction value in accordance with the slope of a video signal, detects generation of aliasing-like noise, steepens an edge having a large amplitude without deterioration in the image quality, and improves a spatial frequency of the video signal.
Claims7
A contour corrector for processing an input video signal based on a unit period corresponding to a pixel to emphasize a contour component of the input signal, comprising:
- a first delay unit for generating a 2T-delayed input video signal by delaying the input video signal by twice the unit period,
- a first subtraction unit for generating a first primary differential signal by subtracting the first delayed input video signal from the input video signal,
- a second delay unit for generating a 2T-delayed primary differential signal by delaying the first primary differential signal by twice the unit period.
- a minimum absolute value computation unit for generating a minimum primary differential signal by selecting a smaller one of the first primary different lot signal and the 2T-delayed primary differential signal,
- a third delay unit for generating a 2T-delayed minimum primary differential signal by delaying the minimum primary differential signal by twice the unit period,
- a second subtraction unit for generating a secondary differential signal by subtracting the first delayed minimum primary differential signal from the minimum primary differential signal Se,
- a fourth delay unit for generating a 1t-delayed minimum primary differential signal by delaying the minimum primary differential signal by the unit period,
- a second minimum value unit for generating a first correction signal by selecting a smaller one of the secondary differential signal and the 1T-delayed minimum primary differential signal
- a computation unit for generating a second correction signal by subjecting the first correction signal and the 2T-delayed primary differential signal to a computation based on a predetermined function,
- a fifth delay unit, for delaying the 3T-delayed input video signal by delaying the input video signal by three times the unit period, and
- a third subtraction unit for generating a contour-corrected video signal by subtracting the second correction signal from the 3T-delayed input video signal.
8 more elements
A contour corrector for processing an input video signal based on a unit period corresponding to a pixel to emphasize a contour component of the input signal, comprising:
- a first delay unit for generating a 2T-delayed input video signal by delaying the input video signal by twice the unit period
- a first subtraction unit for generating a first primary differential signal by subtracting the first delayed input video signal from the input video signal,
- a second delay unit for generating a 2T-delayed primary differential signal by delaying the first primary differential signal by twice the unit period,
- a minimum absolute value computation unit for generating a minimum primary differential signal by selecting a smaller one of the first primary differential signal and the 2T-delayed primary differential signal.
- a fourth delay unit for generating a 2T-delayed minimum primary differential signal by delaying the minimum primary differential signal by twice the unit period,
- a second subtraction unit for generating a secondary differential signal by subtracting the first delayed minimum primary differential signal from the minimum primary differential signal Se,
- a fifth delay unit for generating a 1T-delayed minimum primary differential signal by delaying the minimum primary differential signal by the unit period,
- a sixth delay unit for generating a 1T-delayed input video signal by delaying the input video signal by the unit period,
- a third subtraction unit for generating a second primary differential signal by subtracting the 1T-delayed input video signal from the input video signal,
- a seventh delay unit for generating a 3T-delayed input video signal by delaying the second primary differential signal by three times the unit period,
- a second minimum value unit for generating a first correction signal by selecting a smallest one of the secondary differential signal, the 1T-delayed minimum primary differential signal, and the second delayed primary differential signal, and
- a fourth subtraction unit for generating a contour-corrected video signal by subtracting the first correction signal from the 3T-delayed input video signal.
9 more elements
Dependencies are inferred from the claim text.