Inter-Color-Plane Prediction Adaptability for Video Coding
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Solution Overview
Problem
Existing video coding schemes, such as MPEG-4 AVC/H.264 and HEVC, do not adequately account for color plane sampling locations other than 4:2:0 chroma format and field coding, limiting the applicability of inter-color-plane prediction techniques.
Innovation Solution
The introduction of methods and apparatuses that adapt inter-color-plane prediction to various color plane formats and field coding types, allowing for flexible prediction across different image/video content representations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inter-color-plane prediction is implemented using fixed 4:2:0 chroma format sampling locations, then the prediction process is simple and straightforward, but it cannot accommodate other color plane formats and sampling locations
Solution Approach 1:
The patent implements dynamic adaptability by allowing the inter-color-plane prediction process to adjust its behavior based on the actual color plane format and sampling location being used. Instead of a fixed rigid structure, the system dynamically selects appropriate prediction modes and parameter sets according to the input format, enabling support for 4:2:0, 4:2:2, 4:4:4 and other formats without requiring a completely separate implementation for each format.
Solution Approach 2:
The patent changes key parameters such as chroma_sample_loc_type, chroma_format_idc, and field coding flags to control the prediction behavior. By modifying these parameters based on the input format, the system can adapt the prediction process to match the specific color plane configuration, whether it's 4:2:0, 4:2:2, 4:4:4, or other formats, thus achieving versatility through parameter adjustment rather than structural redesign.
2Adaptability or versatility
If the prediction process is designed to support multiple color plane formats and sampling locations, then adaptability is improved, but the implementation complexity increases
Solution Approach 1:
The patent creates a universal inter-color-plane prediction apparatus that can handle multiple color plane formats (4:2:0, 4:2:2, 4:4:4, planar, packed) and various sampling locations through a single unified implementation. The system uses format identification parameters to route the prediction process through appropriate processing paths, allowing one device to perform multiple functions rather than requiring separate dedicated systems for each format.
Solution Approach 2:
The patent segments the prediction process into distinct stages: format detection, parameter selection, sample location determination, and actual prediction execution. By dividing the complex multi-format support task into manageable segments, each handling a specific aspect of the format adaptation, the implementation becomes more organized and maintainable while still achieving comprehensive format support.
3Adaptability or versatility
If field coding is not considered in the prediction process, then the encoding/decoding process is simpler, but it cannot properly handle field-coded video content
Solution Approach 1:
The patent performs preliminary detection of field coding status (through flags like field_pic_flag or interlaced_flag) before executing the inter-color-plane prediction. By identifying whether the input is field-coded or frame-coded in advance, the system can pre-select the appropriate prediction mode and parameter set, avoiding the need for complex runtime switching during the actual prediction execution.
Data Source
AI summary
Methods and apparatuses for performing inter-color-plane prediction with adaptability to various existing video content representations are provided. A plurality of predetermined rescaling schemes based on a color plane format is selected. A first block of original samples of a first color plane is encoded into a compressed bitstream. A block of reconstructed samples of the first color plane is reconstructed. An inter-color-plane prediction process is performed to produce samples of a second color plane. Said block of prediction samples of the second color plane is subtracted from a second block of original samples of the second color plane to produce a block of residual samples of the second color plane where the positions of the first block and the second block of original samples are aligned. Finally, the block of residual samples of the second color plane is encoded.