Image encoding / decoding method and device

By performing transformation information encoding/decoding at the end of the transformation unit during the image encoding/decoding process, and determining whether to apply secondary inverse transformation based on the block size, the problems of parsing delay and data buffering in the prior art are solved, and efficient image encoding and decoding are achieved.

CN113841399BActive Publication Date: 2025-03-18ELECTRONICS & TELECOMM RES INST +1
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Patent Information

Application Number
CN202080037124.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2019-09-23
Filing Date
2020-06-19
Publication Date
2025-03-18
Estimated Expiration
2040-06-19

AI Technical Summary

Technical Problem

The prior art has problems with parsing delay and data buffering in the image encoding/decoding process, especially in the processing and storage of secondary transformation information.

Method used

By performing transformation information encoding/decoding at the end of the transformation unit, the maximum transform block size and the current block size are determined to determine whether to apply secondary inverse transformation, thereby solving the analytical delay and data buffering problems.

Benefits of technology

It realizes the reduction of parsing delay and data buffering in the image encoding/decoding process, improves image encoding and decoding efficiency, and improves the subjective image quality of the reconstructed picture.

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Abstract

Provided is an image encoding / decoding method and device. The image decoding method disclosed herein may include the following steps: obtaining maximum transform block size information; deriving the maximum transform block size based on the maximum transform block size information; and determining whether to apply a secondary inverse transform to the current block based on the maximum transform block size and the horizontal size and vertical size of the current block.
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