Predictive coding method for coding texture of image
AssigneeNational Chung Cheng University
InventorsJiun-In Guo, Ching-Lung Su, Jeng-Wei Liao
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Abstract
A predictive coding method for coding intra of frames is revealed. Firstly, an encoder divides an image frame into a plurality of macroblocks. Then the encoder sets predictive coding models corresponding to these macroblocks according to a ratio. The encoder performs predictive coding for coding each macroblock according to the corresponding predictive coding model so as to get and output a coded image. By the present invention, various predictive coding models are set and applied to code the different macroblocks so as to increase predictive coding efficiency. The intra prediction efficiency and image compression efficiency are improved simultaneously.
Claims11
A predictive coding method for coding texture of images comprising the steps of:
- dividing an image frame into a plurality of macroblock by an encoder and the image frame corresponding to at least one texture;
- setting the macroblocks as a plurality of first macroblocks and a plurality of second macroblocks by the encoder according to a ratio between a fast intra-prediction mode and a full search mode;
- a setting information is generated;
- the first macroblocks are corresponding to the fast intra-prediction mode while the second macroblocks are corresponding to the full search mod;
- the setting information representing distribution of the first macroblocks and the second macroblocks;
- and
- detecting and using the fast intra-prediction mode or the full search mode for predictive coding of the first macroblocks and the second macroblocks by the encoder according to the setting information;
- wherein when the encoder uses the fast intra-prediction mode for predictive coding of the first macroblocks, predictive coding is performed in accordance with neighboring macroblocks of the first macroblocks by the encoder;
- when the encoder uses the full search mode for predictive coding of the second macroblocks, predictive coding is performed in accordance with different prediction modes for the second macroblocks by the encoder.
A predictive coding method for intra of frame comprising the steps of:
- dividing an image frame into a plurality of macroblock by an encoder and the image frame corresponding to at least one texture;
- setting the macroblocks as a plurality of first macroblocks and a plurality of second macroblocks by the encoder according to a ratio between a fast intra-prediction mode and a full search mode;
- a setting information is generated;
- the first macroblocks are corresponding to the fast intra-prediction mode while the second macroblocks are corresponding to the full search mode;
- the setting information representing distribution of the first macroblocks and the second macroblocks;
- detecting and using the fast intra-prediction mode or the full search mode for predictive coding of the first macroblocks and the second macroblocks by the encoder according to the setting information;
- and
- outputting a coded intra data by the encoder;
- wherein the encoder performs predictive coding according to a reference block of the first macroblock when the encoder uses the fast intra-prediction mode for predictive coding of the first macroblocks;
- the resolution (720×486) of the reference block of the first macroblock is lower than a resolution (720×486) of D1 format.
Dependencies are inferred from the claim text.