Video Signal Processing Apparatus for Contrast and Edge Compensation Control

Solution Overview

Problem

Conventional video signal processing techniques amplify noise when conducting contrast and edge compensation simultaneously, leading to poor image quality due to excessive noise amplification.

Innovation Solution

A video signal processing apparatus that includes a detection circuit for luminance distribution, a contrast compensation circuit, and an edge compensation circuit, where the control circuit adjusts the compensation based on detected luminance ranges to reduce edge compensation in areas with high contrast, thereby minimizing noise amplification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If contrast compensation is conducted to increase image contrast, then image quality is improved, but noise components are amplified

Engineering Contradiction:

Improveimage contrastVSAvoidnoise amplification

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating treatment between different luminance ranges. The control circuit adjusts edge compensation strength based on the detected luminance distribution, applying stronger edge compensation to mid-luminance regions and weaker edge compensation to high-contrast regions. This localized adjustment allows contrast enhancement while preventing noise amplification in specific areas.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making the edge compensation strength variable rather than fixed. The control circuit dynamically adjusts the edge compensation quantity based on real-time detection of luminance distribution and contrast characteristics. When high contrast is detected, the system automatically reduces edge compensation strength to prevent noise amplification, creating a dynamic balance between contrast enhancement and noise control.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If edge compensation is increased to enhance image sharpness, then edge definition is improved, but noise components are amplified doubly when combined with contrast compensation

Engineering Contradiction:

Improveedge definitionVSAvoidnoise amplification

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating treatment between different luminance ranges. The control circuit adjusts edge compensation strength based on the detected luminance distribution, applying stronger edge compensation to mid-luminance regions and weaker edge compensation to high-contrast regions. This localized adjustment allows contrast enhancement while preventing noise amplification in specific areas.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making the edge compensation strength variable rather than fixed. The control circuit dynamically adjusts the edge compensation quantity based on real-time detection of luminance distribution and contrast characteristics. When high contrast is detected, the system automatically reduces edge compensation strength to prevent noise amplification, creating a dynamic balance between contrast enhancement and noise control.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If signal gain is increased to improve contrast, then image contrast is enhanced, but image amplitude becomes large and noise components are amplified

Engineering Contradiction:

Improveimage contrastVSAvoidnoise amplification

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating treatment between different luminance ranges. The control circuit adjusts edge compensation strength based on the detected luminance distribution, applying stronger edge compensation to mid-luminance regions and weaker edge compensation to high-contrast regions. This localized adjustment allows contrast enhancement while preventing noise amplification in specific areas.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making the edge compensation strength variable rather than fixed. The control circuit dynamically adjusts the edge compensation quantity based on real-time detection of luminance distribution and contrast characteristics. When high contrast is detected, the system automatically reduces edge compensation strength to prevent noise amplification, creating a dynamic balance between contrast enhancement and noise control.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS7382414B2Video signal processing apparatus, for controlling contrast compensation and edge compensation in relation to each other in depedence on luminance of an image, and television receiver including the same

Publication Date: 2008.06.03 MAXELL LTD

AI summary

A video signal processing apparatus includes a characteristic detection circuit for detecting luminance distribution corresponding to one frame of a video signal, a contrast compensation circuit for compensating contrast of the video signal, an edge compensation circuit for compensating an edge portion of the video signal, and a control circuit for determining a luminance range to be controlled on the basis of the luminance distribution detected by the characteristic detection circuit, and controlling the contrast compensation circuit and edge compensation circuit to conduct predetermined compensation on the video signal belonging to the luminance range. The control circuit controls the contrast compensation circuit to increase contrast for the video signal in the luminance range as compared with the video signal in other regions, and controls the edge compensation circuit to make an edge compensation quantity for the video signal in the luminance range smaller as compared with other regions.