Image Coding With POC and Non-Reference Picture Flags
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images and videos, particularly in virtual reality and augmented reality, leads to higher data transmission and storage costs due to the increased amount of information required, necessitating a more efficient compression technique.
Innovation Solution
A method and apparatus for enhancing video/image coding efficiency by signaling picture order count (POC) information and non-reference picture flags, allowing for deriving a previous picture in decoding order to optimize compression and decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high resolution and high quality image/video are used, then image quality is improved, but transmission and storage costs are increased
Solution Approach 1:
The patent extracts and removes non-reference pictures from the reference picture list used for inter prediction. By identifying pictures with non_ref_pic_flag set to 1 and excluding them from reference picture lists, the system reduces the amount of data that needs to be transmitted and stored while maintaining compression efficiency for high resolution images and videos.
2Productivity
If more reference pictures are used for inter prediction, then compression efficiency is improved, but data transmission and storage requirements are increased
Solution Approach 1:
The patent applies local quality by differentiating between reference pictures and non-reference pictures using the non_ref_pic_flag syntax element. Reference pictures (flag=0) are maintained in the reference picture list for compression, while non-reference pictures (flag=1) are excluded. This selective approach optimizes compression efficiency for pictures that benefit from inter prediction while reducing data requirements by excluding pictures that would not contribute to compression.
3Measurement precision
If POC information is signaled for all pictures, then decoding accuracy is improved, but signaling overhead is increased
Solution Approach 1:
The patent implements partial action by signaling POC-related information (ph_pic_order_cnt_lsb and ph_poc_msb_cycle_val) selectively rather than for all pictures. The signaling is performed based on specific conditions and picture types, reducing the overall signaling overhead while maintaining sufficient decoding accuracy for proper picture ordering and reference picture list construction.
Data Source
AI summary
According to the disclosure of the present document, image information acquired via a bitstream includes POC information, and a non-reference picture flag related to whether a picture is not used as a reference picture. A POC value of a current picture is derived on the basis of the POC information, and the POC information includes POC information of a previous picture in decoding order for the current picture. The previous picture in the decoding order for deriving the POC value of the current picture may be limited to a picture where a value of the non-reference picture flag is 0. Accordingly, an incorrect POC value can be prevented from being derived in video/image coding.