Image Processing Apparatus Display Capability Determination
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Solution Overview
Problem
Current display devices cannot determine whether they can accurately display images with brightness corresponding to the respective luminance levels of input image data, leading to potential issues with color reproduction and contrast.
Innovation Solution
An image processing apparatus that includes a color gamut conversion unit, an out-of-range determination unit, and a signal selection unit, which converts input image data into a linear RGB color system using a 3x3 matrix and determines if the display device can handle the luminance and color values, outputting warning signals when values exceed displayable limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display devices attempt to display HDR content with wider color space, then color reproduction capability is improved, but the display device cannot properly reproduce colors when its color space is narrower than the content color space
Solution Approach 1:
The system performs preliminary determination of display capability by comparing maximum luminance values and color spaces before actual image display. This allows the display device to assess whether it can accurately reproduce HDR content in advance, and issue warnings or perform conversions before the display process begins, preventing unreliable color reproduction.
Solution Approach 2:
The display device provides feedback about its display capability by comparing its maximum luminance value and color space with the input image data requirements. When the display device cannot meet the requirements, it issues warnings to the user, creating a feedback loop that informs users of potential reproduction issues before they occur.
2Manufacturing precision
If display devices control color and contrast, then image quality is improved, but display devices cannot determine whether they can display images with brightness corresponding to respective luminance levels
Solution Approach 1:
The patent replaces physical measurement of luminance with a computational approach. The display device uses its known maximum luminance value to determine whether it can display images with brightness corresponding to respective luminance levels by comparing the maximum luminance value in the image data with its own maximum luminance capability, eliminating the need for complex physical measurement systems.
3Ease of operation
If display devices define brightness for maximum luminance level, then brightness control is improved, but devices cannot give warnings when brightness corresponding to maximum luminance level is defined in input image data
Solution Approach 1:
The system performs preliminary comparison between the maximum luminance value in the input image data and the display device's maximum luminance capability before displaying the image. This allows the device to issue warnings about potential brightness display issues in advance, preserving complete information about display capability limitations.
Data Source
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AI summary
An image processing apparatus includes a first color gamut conversion unit that converts an input image signal in an XYZ color system into an output image signal in a linear RGB color system by using the inverse matrix of a matrix including, as its components, values obtained by normalizing XYZ values by a predetermined luminance value, the XYZ values being obtained by measuring an image for measurement displayed in a display device for which a determination is made, and a determination unit that determines, when an R, G, or B value of the output image signal is larger than a first predetermined value, that the display device cannot display an image related to the input image signal with brightness corresponding to respective luminance of the input image signal.