Metamer Filtering for Multiprimary Display Subpixel Rendering
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Solution Overview
Problem
Current display systems face challenges in accurately rendering image data on multiprimary displays, particularly in adjusting image data across metamers to improve image rendering accuracy and perception, as existing techniques do not effectively utilize the degree of freedom offered by metamer selection.
Innovation Solution
The implementation of metamer selection and filtering techniques in a color subpixelated multi-primary display system, which allows for the adjustment of subpixel intensities across different metamers to enhance image rendering by utilizing metamer slope values and filtering operations, such as Difference of Gaussian (DOG) sharpening filters, to improve luminance representation and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional subpixel rendering is used on multiprimary displays, then the display can show additional color primaries, but image rendering accuracy and luminance representation deteriorate due to inadequate utilization of metamer selection freedom
Solution Approach 1:
The patent changes the parameters of subpixel intensity allocation by selecting from multiple metamer solutions. Instead of using a fixed mapping from input colors to subpixel values, the system calculates multiple valid metamer sets and selects the optimal one based on local image characteristics, thereby improving luminance representation and rendering accuracy while maintaining multiprimary color coverage
Solution Approach 2:
The patent introduces dynamic metamer selection that adapts to local image content. The system evaluates image gradients, luminance requirements, and color information at each pixel location to dynamically choose the most appropriate metamer set, making the rendering process adaptive rather than static
2Measurement precision
If metamer selection is implemented to improve image rendering accuracy, then luminance representation improves, but computational complexity increases due to filtering operations and optimization requirements
Solution Approach 1:
The patent performs preliminary calculations of metamer slope values and filtering operations before final metamer selection. By pre-computing the metamer basis matrices and slope values, and applying Difference of Gaussian filters to estimate luminance gradients, the system reduces the computational burden during the actual rendering stage
Solution Approach 2:
The patent introduces intermediary filtering operations (Difference of Gaussian filters) that process image data to extract luminance information and guide metamer selection. These filters act as intermediaries between the input image and the final subpixel rendering, simplifying the optimization problem by providing pre-processed luminance constraints
3Manufacturing precision
If metamer filtering operations are applied to reduce rendering errors, then image fidelity improves, but processing time increases due to additional filtering and optimization steps
Solution Approach 1:
The patent applies Difference of Gaussian filters as a preliminary step to estimate luminance gradients and guide subsequent metamer selection. This pre-filtering operation simplifies the optimization problem by providing advance information about luminance requirements, reducing the iterative computation needed in later stages
Solution Approach 2:
The patent changes the processing approach by using analytical solutions based on pre-computed metamer slope values rather than iterative optimization. By formulating the problem in terms of linear combinations of pre-calculated metamer bases, the system achieves high fidelity rendering with reduced computational time
Data Source
Figure 1A~1B
Figure 2
Figure 3~5A
AI summary
Systems and methods of rendering image data to multiprimary displays that adjust image data across metamers are herein disclosed. The metamer filtering may be based upon input image content and may optimize subpixel values to improve image rendering accuracy or perception. The optimizations may be made according to many possible desired effects. One embodiment comprises a display system comprising: a display, said display comprising at least a first set of subpixels and a second set of subpixels further comprising at least one metamer; an input image data unit; a spatial frequency detection unit, said spatial frequency detection unit extracting a spatial frequency characteristic from said input image data; and an adjustment unit, said adjustment unit adjusting image data of said first set and said second set of subpixels according to said spatial frequency characteristic.