Encoding 10-bit Luminance on 8-bit RGB Monitors
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Solution Overview
Problem
Current 8-bit display systems used in radiological applications cannot effectively utilize higher than 8-bit pixel data, limiting radiologists' ability to discern detailed greyscale differences due to the expense and limited precision of 10-bit display hardware.
Innovation Solution
A system that uses standard 8-bit monitors to display greyscale images by adjusting red, green, and blue pixel luminance values to represent higher-bit greyscale luminance data, ensuring at least one value differs from the others, thereby providing corrected luminance values that maintain image integrity without detectable color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 10-bit display hardware is used to display higher-bit greyscale luminance data, then measurement precision of luminance values is improved, but device cost increases significantly
Solution Approach 1:
The patent changes the parameter of bit depth representation by encoding higher-bit luminance values (10-bit or 12-bit) into 8-bit RGB color space parameters. The system uses gamma-corrected RGB values where the luminance relationship L = 0.3R + 0.59G + 0.11B is maintained, allowing precise luminance representation within standard 8-bit display capabilities without requiring expensive 10-bit hardware.
2Ease of manufacture
If 8-bit display systems are used to display higher-bit greyscale images, then device cost is reduced, but measurement precision of luminance values deteriorates
Solution Approach 1:
The patent transitions from a 1-dimensional luminance representation (single grey scale value) to a 3-dimensional RGB color space representation. By distributing the luminance information across three color channels (R, G, B) while maintaining the luminance equation L = 0.3R + 0.59G + 0.11B, the system effectively encodes higher-bit precision luminance data within the 8-bit RGB framework, achieving enhanced precision through dimensional expansion.
3Device complexity
If standard 8-bit monitors are used instead of 10-bit display hardware, then device complexity is reduced, but the ability to discern detailed greyscale differences is limited
Solution Approach 1:
The patent applies local quality by making the RGB color channel values non-uniform while maintaining grey-scale appearance. Specifically, the system adjusts R, G, and B values differently based on the luminance equation, creating subtle local variations in color channel intensities that encode additional luminance precision. These local differences are imperceptible to human vision but provide enhanced greyscale discrimination capability for radiological imaging.
Data Source
AI summary
A system enhances reduced resolution grey scale luminance data for display on a monitor. An interface receives a pixel grey scale luminance value represented by a first number of bits exceeding a display monitor input bit length. A data processor indicates a difference comprising the number of bits. In response to the difference, the data processor derives R, G, B pixel luminance values by adjusting one or more of the R, G, B pixel luminance values to provide corrected R, G, B pixel luminance values representing the grey scale luminance value and at least one of the corrected R, G, B pixel luminance values is different from remaining ones of R, G, B pixel luminance values. The data processor outputs the corrected R, G, B pixel luminance values for display on R, G, B channels of the monitor.