Picture Output Signaling in Image Encoding to Prevent Decoding Errors
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the large amount of data required, necessitating efficient image compression technologies.
Innovation Solution
An image encoding/decoding method and apparatus that includes determining and signaling picture output information in a bitstream, restricting the output layer to include only pictures indicated for output, and encoding reference picture information to optimize processing in a decoded picture buffer, thereby improving encoding/decoding efficiency and preventing inaccurate signaling issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If picture output information is not restricted in the output layer, then encoding flexibility is improved, but signaling accuracy deteriorates and causes decoding errors
Solution Approach 1:
The patent applies parameter changes by restricting the picture output information parameter to specific values (0 or 1) based on the reference picture information parameter. This constraint transforms a potentially ambiguous parameter into a reliably determined one, resolving the contradiction between encoding flexibility and signaling accuracy.
2Manufacturing precision
If all pictures are transmitted without restriction, then picture quality is improved, but transmission cost increases
Solution Approach 1:
The patent extracts only the necessary pictures for output based on reference picture information, removing unnecessary picture data from transmission. This extraction principle reduces transmission data volume while maintaining picture quality for essential frames, resolving the contradiction between quality and quantity.
3Measurement precision
If picture output information is always signaled, then decoding accuracy is improved, but bitstream length increases
Solution Approach 1:
The patent makes the picture output information signaling conditional based on reference picture information, creating a universal rule that applies to all pictures. When reference picture information is available, picture output information is determined without additional signaling, reducing bitstream volume while maintaining decoding accuracy through the established relationship.
Data Source
AI summary
An image encoding/decoding method and apparatus for signaling picture output information and a recording medium storing a bitstream are provided. An image decoding method may comprise obtaining picture output information indicating whether a picture included in an output layer in a bitstream is output and performing processing in a DPB of the picture based on the picture output information. The picture output information of a first value may indicate output of the picture and the picture output information of a second value may indicate non-output of the picture. The bitstream may be restricted so that the output layer in the bitstream includes at least one picture whose picture output information is the first value.