Color Gamut Mapping with Localized 3D LUT Adjustment
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Solution Overview
Problem
Existing image processing techniques for network cameras, such as those using the ITU-R BT.709 standard, fail to maintain the relationship between specific colors and their peripherals during gamut mapping, leading to potential misidentification or alteration of these colors when converting wide color gamut images to standard color spaces.
Innovation Solution
An image processing apparatus with a control unit that modifies the conversion characteristic of image data from a first color space to a second color space, ensuring the color difference between specific and peripheral colors is preserved by adjusting the 3D LUT to maintain the original color difference, thereby preventing misidentification in standard color space conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard gamut mapping is applied to convert wide color gamut images to standard color space, then color data compatibility is improved, but color relationship accuracy deteriorates
Solution Approach 1:
The patent applies different conversion characteristics to different color regions. Specifically, it identifies specific colors (e.g., green, red, blue) and their peripheral colors, then applies enhanced conversion characteristics to preserve the color relationships in these critical regions while using standard conversion for other areas. This local differentiation maintains color accuracy where it matters most while ensuring overall compatibility.
Solution Approach 2:
The patent modifies the conversion parameters dynamically based on the specific color being converted. It calculates color differences between specific colors and their peripherals, then adjusts conversion characteristics to maintain these differences in the target color space. This parameter adjustment ensures that color relationships are preserved even when mapping to standard color spaces with different gamuts.
2Productivity
If conventional 3D LUT conversion is used, then conversion speed is maintained, but color difference preservation deteriorates
Solution Approach 1:
The patent performs preliminary identification of specific colors and their peripheral colors before the actual conversion process. It pre-calculates the color differences and determines which regions require enhanced conversion characteristics. This preliminary action allows the main conversion process to proceed efficiently while applying targeted adjustments only where needed, maintaining both speed and accuracy.
Solution Approach 2:
The patent segments the color space into different regions: specific color regions, peripheral color regions, and other regions. Each segment is processed with appropriate conversion characteristics. This segmentation allows the system to apply complex color relationship preservation only to critical regions while using faster standard conversion for other areas, balancing precision and speed.
Data Source
AI summary
An image processing apparatus includes a control unit configured to control a conversion characteristic for converting image data based on a first color space into image data based on a second color space based on a difference between a specific color and a peripheral color of the specific color in the first color space, wherein the control unit changes a first conversion characteristic into a second conversion characteristic such that a color difference between the specific color and the peripheral color converted by the second conversion characteristic is greater than a color difference between the specific color and the peripheral color converted by the first conversion characteristic.