Video Coding Device Dynamic Frame Field Structure Selection
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Solution Overview
Problem
The existing H.264 video compression standard is computationally expensive and inefficient for real-time applications due to its a-posteriori coding mode, which requires excessive calculations for frame structure predictions, and has a fixed GOP structure that may not optimize bit rate/distortion compromise.
Innovation Solution
A coding device that dynamically chooses between frame and field structures based on spatial and temporal activity measurements, allowing for adaptive GOP structure selection and efficient coding of interlaced or progressive sequences, reducing calculations by 30-60% while maintaining high coding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a-posteriori coding mode is used to achieve best bit rate/distortion compromise, then coding quality is improved, but computational complexity and processing time increase significantly
Solution Approach 1:
The patent applies preliminary action by performing frame/field structure prediction and GOP structure selection before actual coding operations. The system pre-determines the optimal coding structure based on spatial and temporal activity measurements, avoiding the need for extensive post-coding calculations and reducing overall computational complexity while maintaining coding quality.
Solution Approach 2:
The patent implements dynamics by making the coding structure adaptive rather than fixed. The system dynamically selects between frame and field structures based on real-time measurement of spatial and temporal activity, and adjusts GOP structure accordingly. This adaptive approach optimizes coding performance for varying video characteristics without requiring excessive computational resources for a-posteriori optimization.
2Device complexity
If fixed GOP structure is used to simplify processing, then device complexity is reduced, but coding efficiency and bit rate/distortion compromise deteriorate
Solution Approach 1:
The patent transforms the fixed GOP structure into a dynamic one that adapts to video content characteristics. The system measures spatial and temporal activity to determine optimal GOP structure (e.g., number of B frames between P frames), allowing the GOP structure to vary based on actual coding conditions. This dynamic adjustment improves coding efficiency without requiring overly complex processing.
Solution Approach 2:
The patent applies parameter changes by modifying GOP structure parameters (such as the number of B frames between P frames) based on measured spatial and temporal activity. The system adjusts these parameters dynamically to optimize the balance between coding efficiency and processing complexity, rather than using a fixedGOP structure.
3Manufacturing precision
If frame structure coding is used for progressive sequences, then coding quality is improved, but computational costs increase due to extensive predictions required
Solution Approach 1:
The patent applies preliminary action by performing frame/field structure prediction and spatial activity measurement before actual coding operations. The system pre-determines the optimal structure based on measurements, avoiding the need for extensive post-coding calculations and reducing overall computational costs while maintaining coding quality.
Solution Approach 2:
The patent replaces the traditional mechanical system of extensive a-posteriori calculations with a measurement-based prediction approach. By measuring spatial and temporal activity and using these measurements to guide coding decisions, the system substitutes heavy computational predictions with more efficient measurement-driven approaches.
Data Source
AI summary
The invention relates to a device for coding video frame sequences, comprisingmeans (1) for measuring the spatial activity of the video frames to be coded,means (1) for measuring the temporal activity of the video frames to be coded,means (2) for coding the frames as a frame structure or as a field structure.According to the invention, the means (2) for coding the frames as a frame structure or as a field structure are able to choose the field or frame structure dynamically as a function of the measurements of spatial and temporal activity of the said frame.