Image Processing Device Error Diffusion Block Segmentation
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Solution Overview
Problem
Low gradation display capability in display devices leads to contour-like lines and deteriorated image quality, which is improved by using error diffusion methods but still suffers from flickering and apparent boundaries in error diffusion blocks.
Innovation Solution
An image processing device and method that divides the display screen into regions for error diffusion, calculates pixel data based on coefficients and error values, and quantizes data to suppress boundary visibility by continuous error value correction across error diffusion blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If error diffusion method is used to improve image quality, then image quality is improved, but flickering and apparent boundaries appear on the display surface
Solution Approach 1:
The display surface is divided into multiple error diffusion blocks, and error diffusion processing is performed independently within each block. This segmentation allows control over the transmission range of error diffusion, preventing flickering and apparent boundaries while maintaining image quality improvement within each block.
Solution Approach 2:
The patent changes the error diffusion coefficient parameter based on the distance from the center pixel. By using different coefficients for different distance ranges, the error diffusion effect is optimized to reduce flickering and apparent boundaries while maintaining image quality. Specifically, coefficients are adjusted according to whether pixels are within a first distance range or second distance range from the center.
2Manufacturing precision
If error diffusion is performed across the entire display surface, then image quality improves, but the transmission range of error diffusion causes flickering
Solution Approach 1:
The display surface is segmented into multiple error diffusion blocks, limiting the transmission range of error diffusion to within each block. This prevents the accumulation of error diffusion effects across the entire surface that causes flickering, while still allowing image quality improvement within each localized block.
Solution Approach 2:
The patent performs preliminary determination of the error diffusion coefficient based on the distance from the center pixel before performing error diffusion calculation. This preliminary action allows optimization of the diffusion process to prevent excessive transmission range effects that cause flickering.
Data Source
AI summary
An image processing device including a storage part storing an error value corresponding to at least one of second pixels in an image display device, the image display device having a display screen, the display screen having a plurality of pixels, the plurality of pixels having a first pixel and the second pixels, the second pixels surrounding a first pixel, a pixel data calculating pixel data corresponding to the first pixel based on a coefficient in response to a gradation of input data in the second pixel and the error value corresponding to the second pixel, a quantized data calculator quantizing the calculated pixel data and calculating quantized data, and an error value calculator corresponding the calculated pixel data and an error value with the quantized data and storing in the storage part.