Image Decoding Apparatus Output Layer Set Conformance
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Solution Overview
Problem
Conventional image decoding and coding systems face issues with output layer sets, including the possibility of an output layer set without an output layer, leading to unexpected decoder operations, and redundant output layer sets due to overlapping configurations, which result in inefficient coding and decoding processes.
Innovation Solution
An image decoding apparatus that decodes hierarchical image coded data by using a layer set information decoding unit, an output layer set information decoding unit, and a picture decoding unit to specify the bit stream conformance, prevent output layer sets without or with redundant layers, and improve signaling efficiency by designating output layers effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional output layer set designation methods are used, then flexibility in layer configuration is maintained, but output layer sets without output layers or with redundant layers can occur causing unexpected decoder operations
Solution Approach 1:
The patent applies preliminary anti-action by introducing conformance conditions that explicitly prevent the formation of invalid output layer sets before they can cause decoder errors. The conditions check whether each output layer set contains at least one output layer and whether multiple output layer sets have identical layer configurations, thereby proactively avoiding the harmful states that would lead to unreliable decoder operations.
Solution Approach 2:
The patent implements feedback mechanisms through the conformance conditions that provide validation information about the validity of output layer set configurations. The decoder uses this feedback to determine whether the bit stream conforms to the specified conditions, enabling it to detect and handle invalid configurations appropriately rather than proceeding with unreliable operations.
2Adaptability or versatility
If conventional output layer set coding is used, then all layer configurations can be represented, but redundant code is generated due to overlapping layer configurations
Solution Approach 1:
The patent extracts and removes redundant information by prohibiting the coding of output layer sets that have identical layer configurations to previously coded output layer sets. This extraction principle eliminates the redundant code that would otherwise be generated for overlapping configurations, thereby improving coding efficiency while still maintaining the ability to represent all necessary unique layer configurations.
3Manufacturing precision
If hierarchical coding with multiple layers is implemented, then image quality and scalability are improved, but the complexity of decoding multiple layer sets increases
Solution Approach 1:
The patent reduces decoding complexity through preliminary anti-action by preventing the creation of redundant output layer sets with identical configurations. By ensuring that each output layer set has a unique layer configuration, the patent eliminates unnecessary duplicate processing in the decoder, thereby reducing the overall complexity of handling multiple layer sets while preserving the benefits of hierarchical coding for image quality and scalability.
Data Source
AI summary
In a conventional art, an output layer set having no output layer is sometimes defined. Consequently, even if the decoder decodes a bit stream to obtain each layer in the output layer set without the output layer, there is no picture to be outputted. There is a possibility that such coded data causes the decoder expecting an output to operate unexpectedly. Output layer sets having the same configuration may be defined. Consequently, the amount of code pertaining to the output layer sets defined in an overlapping manner is redundant. According to an aspect of the present disclosure, a specification of a bit stream conformance pertaining to the output layer set prevents occurrence of an output layer set without an output layer and a redundant output layer set.