Compressive Coding Device Transparency Control via Segmentation
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Solution Overview
Problem
Existing compressive coding technologies for visual data subjected to transparency control face issues with accurately rendering transparency, as irreversible compressive coding cannot perfectly restore original visual data, leading to incorrect discrimination of transparent and non-transparent pixels, which is exacerbated by the need for additional information that reduces the compression factor.
Innovation Solution
A compressive coding device and visual display control device that utilize a discrimination section to determine if pixel data is subject to transparency control, converting non-transparent data to a specific value and applying irreversible compressive coding, while maintaining the compression factor by avoiding additional bits, ensuring accurate transparency control through reversible and irreversible coding techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If irreversible compressive coding is applied to visual data subjected to transparency control, then the compression factor is improved, but the transparency rendering accuracy deteriorates
Solution Approach 1:
The patent segments pixel data into two categories: transparent pixels and non-transparent pixels. By applying different coding methods to each segment (irreversible compressive coding for non-transparent pixels, reversible compressive coding for transparent pixels), the system achieves both high compression ratios and accurate transparency rendering without requiring additional mask data.
Solution Approach 2:
The patent applies different coding qualities to different regions of the data based on their transparency properties. Non-transparent pixel data undergoes irreversible compressive coding for maximum compression, while transparent pixel data undergoes reversible compressive coding to preserve exact values needed for transparency control. This local differentiation resolves the contradiction between compression efficiency and transparency accuracy.
2Manufacturing precision
If additional information (mask data or additional bits) is attached to compressive coded data to improve transparency control accuracy, then the transparency rendering accuracy is improved, but the compression factor deteriorates
Solution Approach 1:
The patent performs preliminary classification of pixel data into transparent and non-transparent categories before compressive coding. By identifying transparent pixels in advance and applying reversible compressive coding to their data, the system embeds transparency information directly within the pixel data itself, eliminating the need for separate mask data or additional bits and thus maintaining high compression factors.
Data Source
AI summary
A compressive coding device converts three color components of pixel data from the RGB presentation to the YCbCr presentation according to a mapping rule. Converted pixel data are subsequently subjected to irreversible compressive coding, thus producing compressive coded data. Pixel data ascribed to transparency control are converted to a prescribed value out of a mapping range according to the mapping rule. Compressive coded data are supplied to a visual display control device, in which they are decoded and reproduced into original pixel data of the first color presentation. Compressive coded data corresponding to pixel data ascribed to transparency control are rendered with a prescribed color in the RGB presentation which is designated as transparency in advance or not rendered on screen. Thus, it is possible to precisely perform the transparency control without causing a reduction of the compression factor regardless of the irreversible compressive coding and decoding.