Inter-Pixel Filter Switching in Picture Coding for Low-Power Video
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Solution Overview
Problem
Conventional picture coding and decoding systems face challenges in efficiently managing processing power and inter pixel filtering, particularly in mobile devices where power consumption is a concern, and in applications requiring high-quality moving pictures with varying processing capabilities.
Innovation Solution
A picture coding and decoding apparatus that selectively uses multiple inter pixel filters based on processing capability, compression rates, and picture properties, allowing for flexible switching between filters to optimize processing load and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inter pixel filtering is applied to all decoded pictures, then picture quality is improved, but processing load and power consumption increase
Solution Approach 1:
The patent changes the parameter of filter application from universal to selective based on picture type. Intra-predicted pictures receive inter pixel filtering while inter-predicted pictures do not, optimizing the balance between quality and processing load by adjusting the application parameter according to prediction mode
Solution Approach 2:
The patent applies different filtering treatments to different local categories of pictures within the video sequence. By identifying picture types (intra vs inter prediction) and applying filtering only to appropriate categories, it achieves local optimization of quality versus processing cost
2Manufacturing precision
If multiple inter pixel filters are provided for different picture types, then picture quality is optimized, but device complexity increases
Solution Approach 1:
The patent implements a dynamic filter selection mechanism where the filtering operation is adjusted based on real-time picture type identification. The system dynamically switches between applying filter and not applying filter according to the prediction mode of each picture, making the system adaptable rather than static
Solution Approach 2:
The patent segments the video picture stream into different categories (intra-predicted and inter-predicted pictures) and applies different filtering operations to each segment. This segmentation allows quality optimization for important pictures while reducing processing for less critical ones
3Manufacturing precision
If inter pixel filtering is applied to inter-predicted pictures, then picture quality improves, but processing load increases unnecessarily
Solution Approach 1:
The patent extracts and removes the filtering operation from inter-predicted pictures, keeping it only for intra-predicted pictures. By taking out the unnecessary filtering step for inter-predicted pictures, it eliminates wasted processing load while maintaining quality where it matters most
Data Source
AI summary
A picture coding apparatus (300) is a picture coding apparatus that codes a difference between picture data (Img) representing an input picture and predictive picture data (Pred) representing a predictive picture for the input picture and generates coded picture data, and includes a picture decoding unit (104) for decoding coded picture data (Img) after the picture data (Img) is coded; inter pixel filters A and B (303 and 304) for performing inter pixel filter operation for decoded picture data (Recon) obtained by the picture decoding unit (104); switches (301 and 302) for selecting one of the inter pixel filters; and an inter picture predicting unit (108) for generating the predictive picture data (Pred) for the input picture data (Img) using filtered decoded picture data (FilteredImg1), as reference picture data (Ref), obtained by the selected inter pixel filter.