Multiview Image Decoding with Dependent Delimiters for Picture Boundaries

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Solution Overview

Problem

In AVC and MVC, detecting picture boundaries in a Dependent stream is complex due to the absence of unique data strings, making it difficult to correctly reproduce the operation of the virtual buffer model and decode bit streams efficiently.

Innovation Solution

Incorporating a unique data string, such as a Dependent delimiter (DD), at the beginning of each picture in the Dependent stream to easily identify the start of encoded data, allowing for correct decoding and multiplexing with the Base stream, enabling easy detection of picture boundaries and maintaining the virtual buffer model's operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If no unique data string is used in the Dependent stream, then the bit stream compression ratio is improved, but the difficulty of detecting picture boundaries increases

Engineering Contradiction:

Improvebit stream compression ratioVSAvoidpicture boundary detection difficulty

Core Design Contradiction:

Loss of substanceVSDifficulty of detecting and measuring

Solution Approach 1:

A unique data string (dependent delimiter) is introduced as an intermediary marker in the Dependent stream to indicate picture boundaries. This delimiter acts as a mediator that enables easy detection of picture starts without compromising the compression efficiency of the actual image data, as the delimiter is a fixed-length control element.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If a unique data string is added to each picture in the Dependent stream, then the ease of detecting picture boundaries is improved, but the bit stream size increases

Engineering Contradiction:

Improvepicture boundary detection easeVSAvoidbit stream size

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The unique data string (dependent delimiter) is a small, fixed-length control element that is inexpensive in terms of bit stream size. It serves as a temporary marker solely for boundary detection purposes and does not require persistent storage or complex processing, making it a 'cheap' addition that does not significantly increase overall bit stream size.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If unique data strings are individually encoded at the beginning of each Dependent stream picture, then the reliability of virtual buffer model operation is improved, but the device complexity increases

Engineering Contradiction:

Improvevirtual buffer model operation reliabilityVSAvoidencoding and decoding complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The Dependent stream is segmented into discrete picture units, each clearly marked by a unique data string (dependent delimiter). This segmentation allows the decoding apparatus to reliably identify and process each picture independently within the virtual buffer model, improving operational reliability while maintaining straightforward encoding and decoding procedures.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9426480B2Image signal decoding apparatus and image signal decoding method

Publication Date: 2016.08.23 SONY GROUP CORP

AI summary

A decoding method decodes a base stream generated by encoding a first image signal of a first view and a dependent stream generated by encoding a second image signal of a second view. The method includes detecting, on the basis of a dependent delimiter indicating a picture boundary between pictures in the dependent stream, the picture boundary in the dependent stream configured by inserting the dependent delimiter at the beginning of a picture in the dependent stream. Further, the method includes decoding the base stream and the dependent stream on the basis of the detected picture boundary in the dependent stream.