RGBW Color Conversion Using Luminance-Based W Extraction
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Solution Overview
Problem
Conventional methods for converting RGB values to RGBW values fail to fully utilize the gamut boundary of color spaces, leading to inadequate luminance and saturation representation in display devices.
Innovation Solution
A system and method that computes a W value using a maximum saturation value within the gamut boundary, proportional to luminance and inversely proportional to saturation, and employs a tetrahedral interpolation based on an RGBW lookup table to convert RGB values to RGBW values efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Min( ) function is used to extract W value from RGB values, then the extraction process is simple, but the entire gamut boundary of the system cannot be sufficiently used
Solution Approach 1:
The patent changes the parameter used for W value extraction from the minimum RGB value to a luminance-based parameter (Y in YUV space or luminance in HSV space). This parameter change allows the W value to reflect the actual brightness information while enabling full utilization of the gamut boundary, as the luminance value independently represents the brightness component without being constrained by the minimum color channel value.
2Measurement precision
If color space conversion using YUV value is performed, then a W value can be extracted, but a relatively greater weight is assigned to Y signal causing saturation deterioration
Solution Approach 1:
The patent extracts only the luminance component (Y or L) from the color space conversion without fully relying on the YUV or HSV conversion process. By taking out only the essential luminance information and combining it with saturation ratio calculation, the method avoids the problem of excessive weight assignment to the Y signal that causes saturation deterioration, while still achieving accurate W value extraction.
3Productivity
If conventional W value extraction methods are used, then the process is computationally simple, but luminance and saturation values cannot be appropriately reflected
Solution Approach 1:
The patent segments the W value extraction process into two independent components: luminance value extraction and saturation ratio calculation. The luminance value is extracted from the color space conversion, and the saturation ratio is calculated separately by comparing the input saturation with the maximum saturation at that luminance level. This segmentation allows the method to accurately reflect both luminance and saturation while maintaining computational efficiency through the use of pre-calculated lookup tables.
Data Source
AI summary
A system and method of converting a red-green-blue (RGB) pixel to a red-green-blue-white (RGBW) pixel by using a W value extraction, the RGB-to-RGBW converting system including: a lookup table generator to generate an RGBW lookup table using one or more RGB lattice points; and an RGBW value computation unit to compute an RGBW value of an input pixel with respect to an RGB value of the input pixel based on the generated RGBW lookup table.