Decoder buffer control method under frame field adaptive decoding schema

A cache control and decoder technology, applied in the field of image decoding, to achieve the effects of saving cache space, improving execution efficiency, and improving utilization

A cache control and decoder technology, applied in the field of image decoding, to achieve the effects of saving cache space, improving execution efficiency, and improving utilization

CN101389033AActive Publication Date: 2009-03-18SICHUAN CHANGHONG ELECTRIC CO LTD
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] Assuming that the number of reference frames in the decoder is 2, the top field of the current image is allowed as a reference.

[0022] a. Open up a cache of three frames of images in the decoder storage space;

[0023] b. Define a global variable s;

[0024] If the current image encoding mode is frame, set s to the image width; if the current image encoding mode is field, set the span s to twice the image width; in the whole decoding activity, any access to the current image and reference image The case of data across rows is carried out according to the span s;

[0025] Set pointers to the current and reference images:

[0026] pImage represents the address of the current frame buffer, pReference[0], pReference[1] represent the addresses of the reference frame buffer of 2 frames respectively; use pCurImage to represent the current image (frame or field) pointer, use pRef[0], pRef[1], pRef[2], pRef[3] represent the pointers of the reference image (frame or field) r...

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Abstract

This invention is related to the image decoding technology, especially relating to a decoder cache control method under the frame field self-adapting decoding mode. This invention discloses a decoder cache control method under the frame field self-adapting decoding mode aiming to the low utilization ratio of memory, requirement of larger storage area and high cost of decoder of the current technology under the frame field self-adapting decoding mode so conquer the defects. The technical proposal of this invention is the decoder cache control method under the frame field self-adapting decoding mode, comprising following steps: a, dividing an image cache area in the storage area of the decoder; b, pre-determining a span for accessing the current image and a reference image data based on the coding mode of the current image; c, sharing the image cache area by the areas of the frame and the field in the process of image decoding. This invention for the decoder cache control is capable of effectively improving the utilization ratio of the storage area, saving cache area and improving the execution efficiency of the decoder.

Description

technical field [0001] The invention relates to image decoding technology, in particular to a decoder buffer control method in a frame field adaptive decoding mode. Background technique [0002] At present, some popular video compression standards adopt an inter-frame prediction method in order to obtain higher compression performance. Inter-frame prediction is to use one or several frames of reference images adjacent to the current image to predict the current image. In the frame-field adaptive decoding mode, the decoder needs to open up an independent storage space for the frame and field respectively, which is used to store the data of the current frame, reference frame, current field and reference field. If the current image encoding mode is frame and needs to be used as a reference, after the decoding of the current frame is completed, the current frame needs to be separated into two fields. If the encoding mode of the current image is field and needs to be used as a ...

Claims

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Application Information

Patent Timeline
18 Mar 2009
Publication
CN101389033A
IPC
H04N7/32; H04N19/50
Inventors
展华益; 刘明华