Image Processing Device Normalizing High-Luminance Colors
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Solution Overview
Problem
Existing image processing methods fail to intuitively display images with extra-color gamut colors high in luminance, such as fluorescent colors, without disrupting the relative color balance on displays, as they compress colors towards the white side, making it difficult to visualize their relationship with other colors.
Innovation Solution
An image processing device and method that convert unnormalized linear RGB values exceeding the displayable range into normalized values by dividing them by a modulus greater than the maximum value, ensuring the image is displayed within the displayable gamut without altering the color balance, using an image input section, chromatic value acquisition, RGB conversion, normalization, and output sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If colors are compressed toward the white side (high-luminance side) to fit within display gamut, then displayable colors are achieved, but the relative color relationships are distorted and cannot be intuitively visualized
Solution Approach 1:
The patent changes the normalization approach from compressing toward white (high luminance) to compressing toward black (low luminance). Specifically, when RGB values exceed the display gamut, the patent calculates a normalization factor based on the maximum RGB value and divides all RGB components by this factor, thereby scaling down luminance while preserving chromaticity and relative color relationships.
2Measurement precision
If fluorescent colors (extra-color gamut) are displayed, then color accuracy is improved, but the display cannot reproduce these high-luminance colors within its gamut
Solution Approach 1:
Instead of the conventional approach of mapping out-of-gamut colors toward the white point (high luminance), the patent inverts the approach by mapping toward the black point (low luminance). This inversion allows fluorescent and extra-gamut colors to be normalized within the display gamut while maintaining their chromatic characteristics and relative relationships, enabling accurate representation of color hues even if luminance is reduced.
Data Source
AI summary
An image processing device includes an image input section configured to receive input of an image, a chromatic value acquisition section configured to obtain a chromatic value with respect to each of pixels of the image, an RGB conversion section configured to convert the chromatic value of each of the pixels of the image into an unnormalized linear RGB value expressed by a linear RGB value based on a characteristic of a display which outputs the image, a normalization section configured to divide the unnormalized linear RGB value by a modulus higher than a maximum value of linear RGB values which express displayable colors of the display to thereby generate a normalized linear RGB value when the unnormalized linear RGB value of at least one of the pixels is higher than the maximum value, an outputting RGB conversion section configured to convert the normalized linear RGB value into a display outputting RGB value, and an output section configured to output the display outputting RGB value to the display.