Video Bitstream Intra-Profile Constraints for I-Slice Compliance
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Solution Overview
Problem
In existing video coding technologies, there is no constraint on slice type for intra profiles, leading to a possibility that a bitstream specification may not correspond to the intended profile, particularly in applications involving I-pictures.
Innovation Solution
Implementing a bitstream constraint that limits all pictures to I-pictures and slices to I-slices in the encoding and decoding processes, using methods such as setting NAL unit types to 'IRAP' values and controlling slice types through control flags, ensuring compliance with intra profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no constraint is imposed on slice type for intra profiles, then encoding flexibility is maintained, but bitstream specification correspondence to profile becomes unreliable
Solution Approach 1:
The patent changes the parameter of slice type constraint by introducing a profile-specific rule that limits slice types to I-slice only for intra profiles (Main 12 Intra, Main 12 4:4:4 Intra, Main 16 4:4:4 Intra). This parameter change ensures that bitstream specifications reliably correspond to the intended profile while maintaining encoding flexibility through the selective application of the constraint based on profile identification.
2Productivity
If encoder encodes slices as P-slice or B-slice in intra profiles, then encoding efficiency may be improved, but profile compliance is compromised
Solution Approach 1:
The patent applies preliminary anti-action by establishing a preventive constraint that prohibits encoding of P-slices or B-slices in intra profiles before the encoding process occurs. By defining this constraint in advance in the bitstream specification, the patent prevents profile non-compliance while maintaining encoding efficiency through optimized I-slice encoding techniques specific to intra profiles.
Data Source
AI summary
The present disclosure relates to an image processing apparatus and method that enable a specification of a bitstream to correspond to a profile more reliably.In a case where a predetermined condition is satisfied, a moving image as an encoding target is encoded with a picture type of all pictures set as an I-picture. Furthermore, a bitstream of a moving image as a decoding target is decoded, and it is checked whether the picture type of all pictures of the moving image is the I-picture in the bitstream in a case where a predetermined condition is satisfied. The present disclosure can be applied to, for example, an image processing apparatus, an image processing method, or the like.