Differential Modulation for Video Residual Signals in Transform Skip Mode
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Solution Overview
Problem
The increasing size, resolution, and frame rate of video pictures result in larger data amounts, necessitating improved compression technologies for better encoding efficiency and enhanced picture quality.
Innovation Solution
A video encoding and decoding technology using a differential modulation technique for residual signals in the transform skip mode, which involves decoding specific syntax elements from the bitstream to determine if differential modulation is applied, and if so, the modulation direction, to improve compression performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If video data is compressed using conventional encoding techniques (H.264/AVC, HEVC), then the data volume is reduced for storage and transmission, but the picture quality and encoding efficiency are limited by the increasing size, resolution, and frame rate of video pictures
Solution Approach 1:
The patent applies differential modulation to residual signals in the transform skip mode, changing the parameter representation from conventional transform coefficients to differentially modulated values. This parameter transformation reduces the total energy of residual components, enabling more efficient entropy encoding and improving both compression performance and encoding efficiency simultaneously
Solution Approach 2:
The patent replaces the conventional mechanical transform-quantize-encode process with a differential modulation approach. Instead of using traditional discrete cosine transform (DCT) followed by quantization, the system uses differential modulation on residual signals, substituting the mechanical transform process with a more efficient modulation technique that better preserves signal characteristics while reducing bitrate
2Manufacturing precision
If the size, resolution, and frame rate of video pictures are increased to improve picture quality, then the amount of data to be encoded increases, but the hardware resources required for storage and transmission increase accordingly
Solution Approach 1:
By changing the parameter representation of residual signals through differential modulation, the patent reduces the total energy required to represent high-resolution, high-frame-rate video content. This allows maintaining high picture quality while reducing the actual data volume that needs to be stored and transmitted
Data Source
AI summary
Disclosed is a video encoding and decoding technology using a differential modulation technique for a residual signal in order to enhance compression performance in a transform skip mode. The differential modulation technique is applicable to both luma and chroma components as long as the chroma format is not monochrome (i.e. as long as chroma_format_idc=0 is not true).