Image encoding / decoding method, apparatus, and bitstream transmission method for performing PDPC.

The image encoding/decoding method enhances efficiency by applying PDPC based on block size and reference sample lines, addressing the increased costs of high-resolution image transmission and storage.

JP7829113B2Active Publication Date: 2026-03-13NOKIA TECHNOLOGIES OY
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-12-24
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

The increasing demand for high-resolution, high-quality images leads to higher transmission and storage costs due to the increased amount of information, necessitating a more efficient image compression technique.

Method used

An image encoding/decoding method and apparatus that applies Position-Dependent Predictive Coding (PDPC) based on predetermined conditions, such as block size and reference sample lines, to enhance encoding/decoding efficiency by standardizing the application of PDPC for both luminance and chrominance blocks.

Benefits of technology

Improves encoding/decoding efficiency by simplifying the determination of PDPC application, allowing for more efficient transmission and storage of high-resolution images.

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Abstract

An image encoding / decoding method and device for performing PDPC, and a method for transmitting a bitstream are provided. An image decoding method performed by an image decoding device according to the present disclosure may include the steps of: performing intra prediction on a current block to generate a predicted block; determining whether to apply PDPC to the predicted block; and generating a final predicted block of the current block by applying PDPC to the predicted block based on the determination. The step of determining whether to apply PDPC to the predicted block includes determining whether a size of the current block satisfies a predetermined condition, and determining to apply PDPC to the predicted block based on whether the size of the current block satisfies the predetermined condition; and skipping a determination on a color component of the current block and determining not to apply PDPC to the predicted block if the size of the current block does not satisfy the predetermined condition.
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Citation Information

Patent Citations

  • Image signal encoding / decoding method and apparatus therefor

    WO2020096389A1