Intra Random Access Point Picture Reuse in Video Coding
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Solution Overview
Problem
Conventional video compression methods fail to effectively utilize the similarity between temporally non-adjacent shots from the same camera, leading to inefficiencies in bitrate reduction and storage/transmission of video data.
Innovation Solution
The proposed method involves reusing random-access pictures multiple times in the encoding and decoding process, where selected intra random access point (IRAP) pictures are repeated in the bitstream and controlled for display or prediction, allowing for efficient reuse without redundant transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random-access pictures are transmitted multiple times to enable reuse across different random-access segments, then video coding efficiency is improved, but transmission bandwidth is wasted due to redundant transmission
Solution Approach 1:
The patent creates a copy of the reusable IRAP picture in a second random-access segment without retransmitting it. The decoder is enabled to access the picture from the first segment through copying mechanisms, eliminating redundant transmission while maintaining the ability to use the picture as a reference in multiple segments
Solution Approach 2:
The patent merges the function of multiple transmissions into a single transmission by establishing cross-segment references. The same IRAP picture serves multiple random-access segments simultaneously through shared reference mechanisms, combining what would otherwise require separate transmissions
2Quantity of substance
If random-access pictures are reused across multiple random-access segments, then bitrate requirements are reduced, but decoder complexity increases due to additional reference management
Solution Approach 1:
The patent introduces an intermediary reference picture list structure that manages cross-segment references. This intermediary mechanism coordinates the reuse of IRAP pictures across segments, reducing bitrate requirements while systematically managing the complexity through a standardized reference management interface
Solution Approach 2:
The patent changes the parameter of reference picture availability by enabling dynamic control over which pictures are reused across segments. Through parameters such as reuse_flag and segment_id, the system adapts the degree of picture reuse to balance bitrate reduction against decoder complexity
3Productivity
If all IRAP pictures are marked as reusable, then maximum compression efficiency is achieved, but error propagation risk increases across multiple segments
Solution Approach 1:
The patent applies local quality control by selectively marking only certain IRAP pictures as reusable based on their quality and reliability characteristics. Not all IRAP pictures are marked for reuse - only those that meet quality thresholds and are suitable for cross-segment reference, thereby maintaining compression efficiency while limiting error propagation
Solution Approach 2:
The patent implements partial reuse rather than universal reuse of IRAP pictures. By using selective marking mechanisms (reuse_flag set to 1 only for suitable pictures), the system achieves sufficient compression efficiency through partial reuse while avoiding the error propagation risks associated with excessive or universal reuse
Data Source
AI summary
There is disclosed a method, an apparatus and a computer program product for video encoding and decoding. In accordance with an embodiment the method comprises obtaining an intra random access point picture from a first location of a coded video bitstream and determining whether the intra random access point picture is reusable in at least a second location of the coded video bitstream, the at least second location differing from the first location. If the determining indicates that the intra random access point picture is reusable, providing an identification assigned with the intra random access point picture that the intra random access point picture is a reusable intra random access point picture.