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Scalable video coding method and apparatus using pre-decoder

A coding and coding unit technology, applied in the field of video coding, can solve the problem that traditional rate control algorithms cannot be directly applied, etc.

Inactive Publication Date: 2006-10-04
SAMSUNG ELECTRONICS CO LTD
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  • Claims
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Problems solved by technology

However, since the actual bit allocation should only be done after the encoding stage in a scalable video encoder, conventional rate control algorithms using some information only available in the encoder cannot be directly applied

Method used

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  • Scalable video coding method and apparatus using pre-decoder
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  • Scalable video coding method and apparatus using pre-decoder

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Embodiment Construction

[0045] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0046] image 3 is a block diagram showing the operation structure of the wavelet-based scalable video codec according to the present invention. Referring to the figure, the scalable encoder 310 generates a sufficiently large bit stream 35 by encoding an original moving picture, and the rate control module 340 selects an optimal bit amount for each coding unit based on a user's target bit rate 35 . The predecoder 320 receives the input bitstream 35 and extracts the bitstream 40 with sufficient bit quantity by truncating a portion of the bitstream 35 based on the optimum bit quantity selected by the rate control module 340 . Then, the decoder 330 restores the image sequence of the original moving picture from the extracted bitstream 40 and decompresses it. Next, the final decompressed raw motion pictures are generated.

[0047] The pre...

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Abstract

A method and an apparatus for controlling bitrates in an optimal manner by use of information available for use by the pre-decoder, in wavelet-based scalable video coding art using the pre-decoder. A method for controlling bitrates includes the steps of determining the amount of bits for each coding unit relative to a bitstream generated by encoding an original image so as to minimize distortion of the final image from the original image, and extracting a bitstream having the target amount of bits by truncating a part of the generated bitstream based on the determined amount of bits.

Description

technical field [0001] The present invention relates to video coding technology, and more particularly to a method and apparatus for using information available to a pre-decoder in a wavelet-based scalable video coding technology using a pre-decoder to Control the bitrate in an optimal way. Background technique [0002] It is known that the R-D performance (rate-distortion performance) of video coding techniques can be significantly improved by using complex rate control algorithms. Most known techniques allocate a sufficient number of bits to each coding unit in an optimal rate-distortion sense using some useful information generated during the encoding stage. In wavelet-based scalable video coding, the encoder generates a large bit stream, and the pre-decoder or code converter can truncate the bit stream to any size according to the embedding principle. When a bit stream is compressed by an encoding method following the embedding principle, data c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24
Inventor 韩宇镇任昶勋河昊振李培根
Owner SAMSUNG ELECTRONICS CO LTD
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