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Title:
IMAGE ENCODING/DECODING METHOD AND APPARATUS
Document Type and Number:
WIPO Patent Application WO/2021/212440
Kind Code:
A1
Abstract:
The present application relates to the technical field of image processing, and provides an image encoding/decoding method and apparatus. The method comprises: determining a first image unit which comprises a first pixel point of which a normalized pixel value is smaller than or equal to a first threshold and a second pixel point of which a normalized pixel value is greater than the first threshold; performing first transformation on the first normalized pixel value of the first pixel point based on a first gamma curve to obtain a third normalized pixel value of the first pixel point; and performing second transformation on the second normalized pixel value of the second pixel point based on a first linear curve to obtain a fourth normalized pixel value of the second pixel point. According to the present application, the first linear curve is introduced to transform the second pixel point of which the normalized pixel value is greater than the first threshold, so that the operand caused by the gamma curve can be effectively reduced, or the LUT storage and search overhead caused by the gamma curve can be reduced, the complexity of nonlinear transformation is effectively reduced, and the time delay caused by image encoding is further reduced.

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Inventors:
LIN YONGBING (CN)
MA SHA (CN)
Application Number:
PCT/CN2020/086516
Publication Date:
October 28, 2021
Filing Date:
April 23, 2020
Export Citation:
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Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04N1/60; H04N19/124
Foreign References:
CN103281537A2013-09-04
CN108259701A2018-07-06
CN110428379A2019-11-08
CN109584182A2019-04-05
US20180014015A12018-01-11
Attorney, Agent or Firm:
TDIP & PARTNERS (CN)
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