Bit-Depth Extension Signaling for Decoder-Compatible Image Coding
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Solution Overview
Problem
Existing encoding tools for bit-depth extension in image processing may generate bitstreams that are not compatible with decoders that do not support extended operation ranges, leading to decoding failures.
Innovation Solution
An image processing device and method that encodes an operation-range extension flag and control information based on the bit depth of the image, ensuring compatibility with decoders that do not extend the bit depth, by controlling the encoding of these flags and information according to the bit depth constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If encoding tools for bit-depth extension are used, then the operation range (dynamic range) of the encoder and decoder can be extended to support high bit depth and high bit rate, but the generated bitstream becomes incompatible with decoders that do not support extended operation ranges, leading to decoding failures
Solution Approach 1:
The patent applies dynamics by making the encoding process adaptive based on the target decoder's capabilities. The encoder dynamically adjusts whether to apply bit-depth extension tools based on the `sps_range_extension_flag` parameter, allowing the system to switch between extended and standard operation modes. This dynamic adaptation resolves the contradiction by enabling versatility when needed while ensuring compatibility when the extended range is not required
Solution Approach 2:
The patent changes the parameter `sps_range_extension_flag` to control the encoding behavior. When this flag is set to false, the encoder restricts itself to standard operation ranges compatible with all decoders. When set to true, the encoder can utilize extended bit-depth tools. This parameter-based control mechanism allows the system to resolve the contradiction between extending operation range and maintaining bitstream compatibility
Data Source
AI summary
The present disclosure relates to an image processing device and method that enable the use of an encoding tool for bit-depth extension while maintaining compatibility with a specification that does not extend a bit depth of an image. An operation-range extension flag is encoded in accordance with a bit depth of an image, and operation-range extension tool control information is encoded in accordance with the operation-range extension flag. Alternatively, the operation-range extension flag is encoded, and the operation-range extension tool control information is encoded in accordance with a bit depth of an image. The present disclosure can be applied to, for example, an image processing device, an image encoding device, an image decoding device, a transmission device, a reception device, a transmission/reception device, an information processing device, an imaging device, a reproduction device, an electronic device, an image processing method, an information processing method, and the like.