Image encoding device, image decoding device, and program product
By evaluating the similarity between multiple reference images in pixel units in an image coding device and determining areas with large prediction residuals for orthogonal transformation and quantization, the coding efficiency problem caused by reduced similarity between predicted images is solved, and the coding quality and efficiency are improved.
CN115022633BActive Publication Date: 2025-09-19NIPPON HOSO KYOKAI
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Patent Information
- Application Number
- CN202210846128.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2018-03-29
- Filing Date
- 2019-03-29
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2039-03-29
Smart Images
Figure CN115022633B_ABST
Abstract
An image encoding device (1) encodes an object image in block units. The image encoding device (1) includes: a prediction unit (109) for generating a predicted image corresponding to the object image by using a plurality of reference images for prediction; an evaluation unit (111) for evaluating similarities between the plurality of reference images in pixel units; a calculation unit (101) for calculating a prediction residual representing a pixel-based difference between the object image and the predicted image; a determination unit (112) for determining a portion of the prediction residual to which an orthogonal transform and quantization are applied based on an evaluation result of the evaluation unit; and a transform and quantization unit (102) for performing orthogonal transform and quantization limited to the portion of the prediction residual.
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