BD-J Graphics Bit Rate Conversion for HDR Video
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Solution Overview
Problem
Current Blu-ray Disc Java (BD-J) technology generates graphics with a dynamic range of SDR and a bit rate of 8 bits, which requires conversion when handling higher bit rate and dynamic range video formats such as HEVC 1920×1080 BT.2020 HDR 10bit or HEVC 3840×2160 BT.2020 HDR 10bit formats.
Innovation Solution
An information processing apparatus and method that sets and uses conversion equation information to convert the bit rate and dynamic range of images, employing extended classes of the BD-J API to acquire and apply conversion equations, allowing for the generation of images with desired bit rates and dynamic ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BD-J generates graphics using standard SDR 8bit format, then the graphics generation process is simple and compatible with existing systems, but the graphics cannot be directly used with HEVC HDR 10bit video formats requiring conversion
Solution Approach 1:
The patent applies preliminary action by pre-defining conversion equations and parameters (gamma, PQ, HLG) that can be selected and applied when needed. The BD-J execution unit stores multiple conversion equations in advance, allowing rapid conversion without complex real-time calculations, thus resolving the contradiction between format adaptability and conversion complexity.
Solution Approach 2:
The patent employs parameter changes by modifying the bit depth (8bit to 10bit) and transfer characteristics (gamma to PQ/HLG) of the graphics through selected conversion equations. This allows the same graphics generation process to output compatible formats for different video standards, achieving format adaptability without increasing generation complexity.
2Ease of operation
If conversion equations are embedded in BD-J classes, then the conversion functionality is integrated and easy to access, but the BD-J API structure becomes more complex
Solution Approach 1:
The patent merges the conversion equation storage and selection functionality directly into the BD-J execution unit and its classes. By integrating the conversion equations within the existing BD-J object structure (e.g., HGraphicsConfigurationTemplate), the system provides easy access to conversion functionality without requiring separate external conversion modules, thus improving ease of operation while managing API complexity through structured integration.
Data Source
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AI summary
The present disclosure relates to an information processing apparatus, an information processing method and a program as well as a recording medium for enabling at least a bit rate of an image to be reproduced to be converted. A BD-J execution unit sets conversion equation information indicating a conversion equation for converting at least a bit rate of a graphics to be reproduced. A conversion unit converts at least the bit rate of the graphics to be reproduced by use of the conversion equation indicated by the conversion equation information set by the BD-J execution unit. The present disclosure can be applied to a reproducing apparatus and the like for reproducing an optical disc recording therein a stream file of AV stream of main video in a video format different in bit rate or color gamut, a BDJO file, a file of BD-J, and the like.