Reduced-Temporal-Resolution Update for Video Encoding Bit Rate
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Solution Overview
Problem
Existing video compression standards lack support for Reduced-Resolution Update (RRU) methods, which are necessary to reduce bit rate while preserving high frequency details, and require special processing by decoders, limiting their applicability across different manufacturers' products.
Innovation Solution
A system and method for reduced-temporal-resolution update (RTRU) that adjusts the amplitude of quantization parameters for frames and macroblocks based on local activity, allowing for efficient quantization of transform coefficients within existing hybrid coding standards without requiring changes to decoders or standards, thereby reducing bit rate without sacrificing spatial or temporal resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If larger quantization parameters are used for P/B frames to reduce bit rate, then bit rate is reduced, but quality loss increases
Solution Approach 1:
The patent applies different quantization parameter strategies to different frame types (I-frames use smaller QP for high quality, P/B-frames use larger QP for compression). This local differentiation allows each frame type to be optimized independently, achieving overall quality-rate optimization without uniform quality degradation across all frames.
2Quantity of substance
If Reduced-Resolution Update methods are implemented to reduce bit rate, then bit rate is reduced, but decoder complexity and compatibility requirements increase
Solution Approach 1:
The patent implements RTRU within existing hybrid coding standards (MPEG-2, MPEG-4, H.264/AVC) that are already widely deployed. By making the encoder unidirectional and compatible with existing decoder implementations, the solution achieves reduced bit rate without requiring new decoder complexity or special processing capabilities that would limit compatibility.
Solution Approach 2:
The patent makes the RTRU process self-contained at the encoder side, where all complex processing (quantization parameter adjustment, frame type differentiation) is performed unidirectionally by the encoder. The decoder simply processes the already-optimized bitstream using existing standard-compliant operations, eliminating the need for complex decoder modifications.
3Quantity of substance
If frame dropping is used to reduce bit rate, then bit rate is reduced, but temporal resolution and quality are degraded
Solution Approach 1:
Instead of dropping frames (which reduces temporal resolution), the patent changes the quantization parameter values dynamically based on frame type. I-frames use smaller QP to preserve quality, while P/B-frames use larger QP to reduce bit rate. This parameter adjustment achieves compression without frame removal, maintaining full temporal resolution.
Data Source
AI summary
A novel system and method of Reduced-Temporal-Resolution Update (RTRU) and quantizing video transform coefficients is provided for use using hybrid coding standards when receiving a frame from within a group of video frames, where the amplitude of the quantization parameter is defined for the quantization of the frame according to a reduced temporal resolution update process; where the amplitude of the quantization parameter for macroblocks in the frame is defined according to a reduced temporal resolution update process; and where a bitstream is composed for transmission and subsequent decoding by a standard compliant decoder.