Picture element caching method and system in movement compensation process of video decoder

Abstract

An image element cache method and system, which is used in the motion compensation of an audio decoder in the field of audio decoding, includes: step 1. Reading motion compensation parameter information from the parameter memorizer; step 2. Zoning the area of the reference frame where the current basic block of motion compensation needs; step 3. Reading and selecting the image elements that are not in the internal memorizer out of the external memorizer and memorizing them in the internal memorizer; step 4. Reading and selecting out the data in the reference frame image element unit of the reference frame area from the internal memorizer in turn, and sending them together with the current motion vector of the basic block to an external interpolator. The invention system includes: an overall controlling module, a parameter module reading motion compensation, a reference frame area module which the motion compensation need, a judging and replacing module of image element unit, a controlling module of interpolation data output, and a memorizing module of data and label. The invention reduces the bandwidth need for external memorizer, and resolves the bandwidth bottleneck problem of the external memorizer of the audio decoder design.

Description

technical field [0001] The present invention relates to a method and system in the field of video decoding, in particular to a pixel buffering method and system in the motion compensation process of a video decoder. Background technique [0002] Motion compensation is the inverse process of motion estimation, and it is an effective method to reduce temporal redundant information in video sequences. The current mainstream video codec standards, such as MPEG-x series, H26x series and China's AVS standard, all use motion compensation technology, and they only have certain differences in parameter selection. [0003] Since each frame image in a video sequence contains a large amount of data, in the design of a video decoder, the decoded frame is usually stored in an external memory with a large storage capacity and a slow access speed, such as SDRAM (Synchronous Dynamic Random Access Memory) ), some of these frames stored in the external memory will be used as reference frames ...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) Due to the uncertainty of the reference frame area reused in motion compensation, this area can only be estimated empirically before decoding a macroblock. This empirical estimation causes two defects: one Because the shape of the reference frame area reused by motion compensation is usually irregular, the above methods all use the method of rectangular approximation, that is, prefetch one or several smaller rectangular areas into the cache space, and use the reused area The rate is not high; the second is that it may appear that the reference frame data pre-read into the cache space is not used by the motion compensation process at all

(2) This method is carried out for each macroblock, and between adjacent macroblocks, a large amount of data will be reused in the motion compensation process, this method cannot reuse these data, so the access to the external memory The amount of reduction effect is not very obvious

Images