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Systems and methods for adaptively filtering DCT coefficients in a video encoder

A technology of video coding and coefficients, applied in the field of video coding, can solve problems such as insufficient decoding buffer, data loss, freezing of picture sequences, etc.

Inactive Publication Date: 2005-05-18
COREL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TM5 has many shortcomings, for example, TM5 cannot guarantee compliance with the requirements of the Video Buffer Checker (VBV)
As a result, the decoding buffer overflows and runs short, resulting in freezing of the picture sequence and loss of data

Method used

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  • Systems and methods for adaptively filtering DCT coefficients in a video encoder
  • Systems and methods for adaptively filtering DCT coefficients in a video encoder
  • Systems and methods for adaptively filtering DCT coefficients in a video encoder

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Embodiment Construction

[0051] figure 1 It is to describe the sequence of images 102. When the specific embodiment of the present invention describes the sequence of moving image compression coding (MPEG-2) and images, its principles and functions are applicable to other developed video standards such as H.261, H.263, H.264, MPEG-1, MPEG-4. The meaning of the word image here includes images, images, frames, video object planes (VOPs) and other similar meanings. A video sequence includes multiple video images captured at a fixed specific time, and the playback rate of the images in a frame depends on the rate of the images or the rate of the frame. The images in the image sequence can be interleaved images or non-interlaced images, such as progressive images. For the so-called interlaced image, it is produced by interlacing images formed by two different background colors. Images without interlacing are produced in a manner that does not interlace or progressive images between images.

[0052] The...

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Abstract

Systems and methods for adaptively filtering DCT coefficients in a video encoder. The present invention relates to a system and method that provides selective filtering of discrete cosine transform (DCT) coefficients, and the filtering of the DCT coefficients is performed in the frequency domain instead of the dense pixel domain (time domain). This DCT filtering is performed in the DCT encoding loop, rather than at a processing port independent of the encoding loop. This DCT filtering is beneficial in reducing the number of bits used to encode the image, it preserves buffer-compliant buffer model occupancy levels, and improves image quality by saving bits more than conventional techniques, such as quantization parameter (QP) values Increase.

Description

technical field [0001] The present invention generally relates to a video coding technique, and in particular to an adaptive filtering of discrete cosine transform (DCT) coefficients. Background technique [0002] Various digital video compression techniques have been produced, which are transmitted or stored at a lower data rate or with less storage space. Such compression technology includes international standards, such as H.261, H.263, H.263+, H.263++, H.264, MPEG-1, MPEG-2, MPEG-4 and MPEG-7, etc., these Compression techniques successfully achieve higher compression ratios through techniques such as discrete cosine transform (DCT) and motion compression (MC). This video compression technology allows video data streams to be effectively transmitted through various digital networks, such as mobile phones, computer networks, cable networks, satellites, etc., and stored on hard drives, CDs, VCDs, digital Video discs (DVDs) and other storage media. The coded data stream i...

Claims

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Application Information

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IPC IPC(8): H04N7/30G06F17/10H03M7/30H04N7/12H04N7/26H04N7/46H04N7/50
CPCH04N19/103H04N19/115H04N19/117H04N19/124H04N19/126H04N19/132H04N19/137H04N19/139H04N19/14H04N19/142H04N19/149H04N19/152H04N19/154H04N19/156H04N19/159H04N19/172H04N19/176H04N19/196H04N19/198H04N19/48H04N19/52H04N19/577H04N19/61H04N19/82H04N19/87
Inventor 卡达汪迪斯赵立峰
Owner COREL CORP
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