Color Conversion Table Generation for Expanded Color Spaces
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Solution Overview
Problem
Conventional image processing methods struggle with color adjustment and conversion when the color space of a sample image differs from that of the display device, particularly failing to handle images in expanded color spaces like Adobe RGB or Wide Gamut RGB, as they are based on standard color spaces like sRGB, leading to incorrect display and difficulty in generating suitable color conversion tables.
Innovation Solution
An image processing method and apparatus that generates a first color conversion table in a standard color space and then creates a second color conversion table for an expanded color space, allowing for color adjustment and conversion across different color spaces, enabling color conversion in both standard and expanded color spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If color adjustment is performed on a sample image in standard color space (sRGB) while watching a display device, then color conversion can be performed on images in standard color space, but color conversion cannot be correctly performed on images in expanded color space (Adobe RGB, Wide Gamut RGB) because the display device cannot correctly display colors outside the standard color space gamut
Solution Approach 1:
The patent divides the color conversion process into two separate processing sections: an image color adjustment processing section that generates a color conversion table from a sample image, and an image color conversion processing section that performs actual color conversion. This segmentation allows each section to handle different color spaces independently, enabling both standard and expanded color space images to be processed correctly.
Solution Approach 2:
The patent introduces an intermediate color conversion table that serves as a bridge between the sample image color space and the target color space. This intermediate table allows color conversion to be performed through multiple steps (sample image color space → intermediate color space → target color space), enabling accurate conversion even when the display device cannot directly display the target color space colors.
2Ease of manufacture
If a color conversion table is generated based on a sample image in standard color space, then color conversion can be performed on standard color space images, but the color conversion table cannot be applied to images in expanded color space because it does not respond to colors outside the standard color space gamut
Solution Approach 1:
The patent creates a color conversion table generation mechanism that can handle multiple color spaces universally. By allowing the sample image to be in any color space (standard or expanded) and generating a corresponding color conversion table that reflects the color characteristics of that specific color space, the system achieves multi-functionality where a single processing flow can handle diverse color space requirements.
Solution Approach 2:
The patent changes the parameters of the color conversion table to match the color space characteristics of the sample image. When a sample image in expanded color space is used, the color conversion table is generated with parameters that respond to colors outside the standard color space gamut, enabling the table to be applied to images in that expanded color space.
3Ease of operation
If color adjustment is performed while watching a display device, then the user can visually confirm color changes, but colors outside the display device's color gamut cannot be correctly displayed, making it difficult to perform intended color adjustment
Solution Approach 1:
The patent uses a sample image that is processed to create a color conversion table, which then serves as a template or copy for applying color adjustments to other images. The sample image is carefully selected and processed to represent the desired color characteristics, and its color conversion table is then applied universally to images in the same color space, ensuring consistent and accurate color adjustment without requiring direct visual confirmation of all color values.
Data Source
AI summary
One embodiment of the present invention is to provide an image processing method and an image processing apparatus which can also handle data other than a standard color space and can also handle a case in which the color space of an image color adjustment processing section and that of an image color conversion processing section are different from each other. In one embodiment of the present invention, predetermined color conversion is performed on an image in a first color space, and a first color conversion table defined in the first color space is generated. Next, based on the first color conversion table, a second color conversion table defined in a second color space is generated.