Endoscopic Image Tone Correction With Ratio-Preserving Edge Enhancement
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Solution Overview
Problem
Edge enhancement processing is influenced by tone conversion processing characteristics, leading to improper performance when applied to high-contrast videos with blurred edges and blocked up shadows or blown out highlights.
Innovation Solution
An image processing apparatus that generates multiple tone correction signals by converting tone characteristics of image signals in different wavelength bands while maintaining pixel value ratios, and combines these signals with edge enhancement processing to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tone conversion processing is performed to correct blocked up shadows or blown out highlights, then image quality in high-contrast regions is improved, but edge enhancement processing is influenced by tone conversion characteristics and cannot be properly performed
Solution Approach 1:
The image processing is divided into separate processing stages: tone conversion processing is performed first to correct blocked up shadows or blown out highlights, and then edge enhancement processing is performed on the tone-converted image. This segmentation allows each processing step to be optimized independently, preventing the edge enhancement from being adversely influenced by tone conversion characteristics.
2Manufacturing precision
If both edge enhancement processing and tone conversion processing are intensively performed, then image quality is improved, but the edge enhancement processing is influenced by tone conversion processing characteristics
Solution Approach 1:
Tone conversion processing is performed as a preliminary step before edge enhancement processing. By completing the tone conversion first, the subsequent edge enhancement processing operates on already-corrected image data, ensuring that edge enhancement is not influenced by the characteristics of tone conversion processing.
Data Source
AI summary
An image processing apparatus including a tone correction unit configured to generate a plurality of tone correction signals by converting tone characteristics of a plurality of image signals in different wavelength bands, an edge enhancement unit configured to generate an edge enhancement signal by performing predetermined processing with respect to at least one image signal of the plurality of image signals, and a combining unit configured to combine a signal based on the plurality of tone correction signals and the edge enhancement signal is provided. The tone correction unit is configured to generate at least two tone correction signals by converting tone characteristics of at least two image signals of the plurality of image signals while maintaining ratios between pixels respectively corresponding to the at least two image signals.