Display System Gamma Processing for Low-Luminance Quality
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Solution Overview
Problem
Existing display systems face image quality degradation in low-luminance areas due to data capacity limitations of transmission paths, leading to increased product costs and reduced usability when multiple cables are used to increase data per pixel.
Innovation Solution
A display system with a decoder, analyzer, determinor, and encoder that analyze luminance distribution to determine and apply gamma curves for encoding and decoding video signals, optimizing data transmission and reducing image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amount of data per pixel is increased to prevent degradation in image quality in low-luminance areas, then image quality is improved, but the display area that can be covered by a single cable decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the gamma curve based on the luminance distribution of the video content. Instead of using a fixed high-bit-depth encoding for all scenarios, the system analyzes the luminance histogram and selects appropriate gamma curves (e.g., from a set including gamma 2.2, gamma 2.4, gamma 2.6) to optimize both image quality and data compression. This allows the system to maintain high image quality in low-luminance areas when needed while reducing data transmission requirements when the content doesn't demand it, thereby expanding the display area coverable by a single cable.
2Manufacturing precision
If the number of cable connections is increased to transmit more data per pixel, then image quality is improved, but product costs increase and usability decreases
Solution Approach 1:
The system changes the parameter of gamma curve selection based on luminance distribution analysis, enabling efficient data compression that maintains image quality without requiring additional cable connections. By optimizing the encoding parameters dynamically, the patent reduces the data transmission burden, allowing high-quality image transmission over existing single-cable infrastructure.
Solution Approach 2:
The patent implements feedback by analyzing the luminance distribution of the video content and using this information to adjust the encoding parameters. The system continuously monitors the video signal characteristics and adapts the gamma curve selection accordingly, creating a closed-loop system that optimizes image quality while minimizing data transmission requirements, thus avoiding the need for additional cables or increased system complexity.
3Manufacturing precision
If gamma processing is performed before image processing to reduce data loss in low-luminance areas, then image quality degradation is suppressed, but data loss in inverse gamma processing after image processing is not considered
Solution Approach 1:
The patent applies preliminary action by performing gamma processing before image processing to reduce data loss in low-luminance areas during encoding. However, it goes further by also considering and compensating for data loss that will occur during inverse gamma processing after image processing. The system pre-calculates and applies appropriate gamma curves that account for the entire processing chain, including the subsequent inverse gamma operation, thereby minimizing cumulative data loss throughout the complete signal processing pipeline.
Solution Approach 2:
The system uses feedback by analyzing the luminance distribution and selecting gamma curves that optimize performance through the complete processing chain including inverse gamma processing. The luminance histogram analysis provides feedback that guides the selection of gamma curves designed to minimize data loss when the processed signal undergoes inverse gamma conversion, ensuring overall image quality preservation.
Data Source
AI summary
A display system includes: a first decoder that decodes a first video signal and outputs a second video signal; and an analyzer that analyzes the second video signal and acquires a luminance distribution in at least a part of an analysis range. The display system includes a first determinor that determines a first gamma curve on the basis of the luminance distribution; an encoder that outputs a third video signal obtained by encoding the second video signal using the first gamma curve; a second determinor that determines a second gamma curve on the basis of the third video signal and gamma curve information; and a second decoder that outputs a fourth video signal obtained by decoding the third video signal using the second gamma curve. The display system includes a display that displays a video on the basis of the fourth video signal.