Image Quality Enhancement Apparatus Mitigating Edge Overshoot
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Solution Overview
Problem
Conventional image-processing techniques, such as peaking operations, often result in undesirable overshoot/undershoot effects on image edges, degrading image quality.
Innovation Solution
An image quality enhancement apparatus comprising a peaking filter, a selecting circuit, and a luminance setting circuit that adjusts the luminance value of target pixels based on the luminance values of nearby pixels, using a high-pass filter, delay elements, and median filters to mitigate overshoot/undershoot effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a peaking operation is applied to enhance edge sharpness, then image sharpness is improved, but overshoot/undershoot effects occur on image edges
Solution Approach 1:
The patent segments the image processing into distinct stages: first applying the peaking operation to enhance edges, then separately processing pixels based on their luminance characteristics. By dividing the processing into stages and selectively applying different operations to different pixel types (edge pixels vs. non-edge pixels), the patent achieves sharpness enhancement while preventing overshoot/undershoot effects in appropriate regions
Solution Approach 2:
The patent applies different processing strategies to different local regions and pixel types. Edge pixels undergo peaking enhancement to improve sharpness, while non-edge pixels have their luminance values adjusted or clamped to prevent overshoot/undershoot. This localized quality adjustment ensures that each region receives the appropriate processing intensity based on its characteristics
Data Source
AI summary
A method for enhancing image quality includes: performing a peaking operation on an image signal to generate a peaking signal; selecting a plurality of pixels from the peaking signal and the image signal; and deciding a luminance value for a target pixel of the image signal according to luminance values of the plurality of pixels.