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Video decoder with scalable compression and buffer for storing and retrieving reference frame data

A video decoder and compression ratio technology, applied in the field of video decoders, can solve the problems of constant changes in memory access bandwidth, video content, no reduction in memory access bandwidth, and no reduction in memory bandwidth requirements.

Inactive Publication Date: 2010-12-22
ENTROPIC COMM INC
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Problems solved by technology

[0005] One disadvantage is that vector control prediction requires randomly positioned block-based access to one or more reference frames in memory
This access to DRAM-based memory is quite inefficient
A second disadvantage is the constant variation in video content dependent memory access bandwidth required for reconstructing vector predicted frames
[0009] A disadvantage of the above described decoder system and method according to US 6088391 is that it is only able to partially reduce memory capacity requirements, without reducing memory bandwidth requirements, without simplifying the memory access profile, and without reducing the required memory capacity. Constant changes in access bandwidth

Method used

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  • Video decoder with scalable compression and buffer for storing and retrieving reference frame data
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  • Video decoder with scalable compression and buffer for storing and retrieving reference frame data

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Embodiment Construction

[0031]In order to simplify the external memory access profile and eliminate the constant variation in the external memory access bandwidth required by video decoders, according to the invention an integrated memory is proposed. The integrated memory is used as a buffer 8, which is accessed in a first-in-first-out (FIFO) manner when video data is transferred from the external memory into the buffer, and is constructed from motion vectors, e.g. The prefetch unit of the frame device is accessed in a block-based manner. The function of the buffer 8 is to hide the complex (vector control) memory access profile and the constant variation of the memory access bandwidth from the external memory 9 .

[0032] In effect, the buffer implements a FIFO for each reference frame. Thus, in the case of an MPEG-2 decoder, the buffer 8 will contain a maximum of two FIFOs. In FIFO mode, the preferred granularity of FIFO elements in buffer 8 is a slice, which is a row of macroblocks. A slice is ...

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Abstract

The present invention relates to a video decoder having means for compressing reference frame data (6) using a scalable compression method. The video decoder further having buffer means (8) for intermediate storing of at least the vertical aperture (range) of motion vectors plus one row (slice) of macro blocks in lines of video per reference frame. Further it includes means for decompressing reference frame data (7) for enabling means for motion compensation (10) of said decoder to reconstruct vector predicted pictures and macro blocks utilizing said decompressed reference frame data. The present invention also relates to a method to be implemented by such a video decoder.

Description

technical field [0001] This patent application relates to video decoders, and more particularly to video decoders with simplified memory access profiles. Background technique [0002] In the field of digital video, the most common types of picture coding are: I-pictures (intra-coded pictures), which are coded without reference to any other pictures, and are often called reference frames or anchor frames; pictures), from past I or P reference pictures, encoded using motion-compensated prediction; and B pictures (bidirectionally predictively coded pictures), from previous (later) and future (front) I or P pictures using Motion compensation encodes it. These picture types are also sometimes referred to as I, P, or B frames. [0003] The compression standard known as MPEG (Moving Picture Experts Group) compression is a set of methods for compressing and decompressing full motion video images using frame compression techniques as described above. Among them, MPEG compression u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/50H04N7/26H04N19/89
CPCH04N7/26351H04N19/00781H04N19/00218H04N19/00321H04N19/00515H04N19/00533H04N19/00503H04N19/00018H04N19/103H04N19/159H04N19/187H04N19/428H04N19/433H04N19/44H04N19/61
Inventor 约翰内斯·Y·齐克拉尔彼得·H·弗伦肯雷姆科·舒特
Owner ENTROPIC COMM INC
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