Image Encoding Reference Management for Interlaced Video
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Solution Overview
Problem
Conventional image encoding and decoding methods face inefficiencies when encoding images on a per field basis, particularly due to prohibited references between fields with high correlation, which reduces prediction accuracy and compression efficiency.
Innovation Solution
An image encoding method that determines whether a current picture is a temporal sub-layer access (TSA) picture or a trailing picture, allowing or prohibiting references accordingly, and an image decoding method that identifies and decodes pictures based on these determinations to optimize processing and memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reference from higher layer to lower layer is prohibited in conventional encoding, then device complexity is reduced, but prediction accuracy and compression efficiency deteriorate
Solution Approach 1:
The patent dynamically determines reference picture availability based on picture type (TSA vs trailing) and layer hierarchy relationships. The reference prohibition is not static but adaptively applied only when necessary (from higher layer to lower layer in specific picture configurations), allowing reference usage in other valid scenarios to maintain prediction accuracy while preventing harmful references that would complicate decoding.
Solution Approach 2:
The patent applies different reference restrictions to different picture types and layer combinations. Specifically, it prohibits reference from higher layer to lower layer only in specific cases (TSA pictures with trailing pictures in lower layer), while allowing references in other valid configurations. This localized application of reference constraints maintains prediction accuracy where possible while preventing harmful references.
2Productivity
If reference from higher layer to lower layer is prohibited, then processing efficiency is improved, but compression efficiency deteriorates
Solution Approach 1:
The patent implements dynamic reference management where the availability of reference pictures is determined based on the current picture type and layer relationships. This dynamic approach optimizes compression efficiency by allowing references when beneficial (improving compression) while maintaining processing efficiency by clearly defining when references are prohibited (avoiding complex processing).
Solution Approach 2:
The patent changes the reference availability parameter based on picture type classification. By identifying whether a picture is a TSA picture or trailing picture and adjusting reference permissions accordingly, the system optimizes the balance between compression efficiency (utilizing available references) and processing efficiency (clearly defined reference rules).
3Quantity of substance
If reference restriction is applied between fields, then memory requirements are reduced, but prediction accuracy deteriorates
Solution Approach 1:
The patent applies reference restrictions locally based on field relationships and layer hierarchy. It prohibits reference from higher layer to lower layer specifically in interlaced picture configurations where field correlation is high, reducing memory requirements for storing reference pictures while maintaining prediction accuracy by allowing references in other valid configurations where fields are less correlated.
Solution Approach 2:
The patent dynamically adjusts reference picture availability based on the interlaced picture structure and field encoding order. By determining picture type (TSA vs trailing) and layer relationships, the system optimally manages memory requirements while preserving prediction accuracy through selective reference usage in appropriate field configurations.
Data Source
AI summary
An image encoding method includes: determining whether a current picture is a TSA picture or a trailing picture; and encoding a plurality of pictures according to whether the current picture is the TSA picture or a trailing picture. The determining includes: determining the current picture to be the TSA picture when the current picture does not belong to the highest layer and corresponds to a first field, and determining the current picture to be the trailing picture when the current picture belongs to the highest layer or corresponds to a second field.