Color Conversion Processor Reducing Computation for Narrow Gamut RGB Signals
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Solution Overview
Problem
Existing color conversion techniques for image display devices incur increased computation to maintain hue and luminance during color signal conversion, particularly when adapting RGB color signals to a narrower color gamut, leading to inefficient processing.
Innovation Solution
A color conversion processor that includes a conversion unit for converting color data between color gamuts, a color correction unit for offset processing using the minimum color component value, and a luminance correction unit that derives and applies a luminance correction value to reduce computational complexity, employing quadratic function approximation to simplify calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offset processing and gain adjustment are performed to maintain hue and luminance during color conversion, then color accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent extracts and processes only the minimum color signal value from the RGB color signals to generate the offset value, rather than processing all color signal values. This selective extraction reduces computational complexity while still achieving the goal of maintaining hue and luminance accuracy during color conversion.
Solution Approach 2:
The patent changes the processing approach by using the minimum color signal value as a key parameter to derive both the offset value and luminance correction value. This parameter change simplifies the overall computation by focusing on a single critical parameter (minimum value) rather than processing all color signal values equally.
2Adaptability or versatility
If color conversion processing is performed to adapt color signals to a narrower color gamut, then display compatibility is improved, but computation time increases
Solution Approach 1:
The patent performs preliminary action by detecting the minimum color signal value before the actual color conversion process. This preliminary detection enables the subsequent offset processing and luminance correction to be performed more efficiently, reducing overall computation time while maintaining display compatibility across different color gamuts.
Data Source
AI summary
An object of the present invention is to reduce computation for color conversion processing on input RGB color signals with maintaining the hue of a picture expressed by the input RGB color signals. A color conversion processor of the present invention includes: a conversion unit that converts color data including multiple color components, which can be displayed in a first color gamut, to corresponding color data in a second color gamut, which is narrower than the first color gamut; a first color correction unit that corrects the converted color data by using a first color correction value; a first derivation unit that derives a first luminance correction value by multiplication using the first color correction value; and a first luminance correction unit that corrects the color data, corrected by the first color correction unit, by using the first luminance correction value.