Systems methods for adjusting targeted bit allocation based on an occupancy level of a VBV buffer model

a buffer model and occupancy level technology, applied in the field of video encoding techniques, can solve the problems of limiting the data rate that is available for encoding, video encoding can consume a relatively large amount of data, and the video encoding process often trades image quality against the number, so as to improve the bit rate control

Inactive Publication Date: 2008-05-29
COREL CORP
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Benefits of technology

[0010]The invention is related to methods and apparatus that advantageously improve bit rate control in a video encoder, such as an MPEG video encoder. One embodiment of the inv...

Problems solved by technology

For relatively high image quality, video encoding can consume a relatively large amount of data.
However, the communication networks that carry the video data can limit the data rate that is available for encoding.
As a result, a video encoding process often trades off image quality against the number of bits used to compress the images.
Moreover, video encoding can be relatively complex.
For example, where implemented in software, the video encoding process can consume relatively many CPU cy...

Method used

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  • Systems methods for adjusting targeted bit allocation based on an occupancy level of a VBV buffer model
  • Systems methods for adjusting targeted bit allocation based on an occupancy level of a VBV buffer model
  • Systems methods for adjusting targeted bit allocation based on an occupancy level of a VBV buffer model

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Embodiment Construction

[0026]Although this invention will be described in terms of certain preferred embodiments, other embodiments that are apparent to those of ordinary skill in the art, including embodiments that do not provide all of the benefits and features set forth herein, are also within the scope of this invention. Accordingly, the scope of the invention is defined only by reference to the appended claims.

[0027]FIG. 1 illustrates a sequence of pictures 102. While embodiments of the invention are described in the context of MPEG-2 and pictures, the principles and advantages described herein are also applicable to other video standards including H.261, H.263, MPEG-1, and MPEG-4, as well as video standards yet to be developed. The term “picture” will be used herein and encompasses pictures, images, frames, visual object planes (VOPs), and the like. A video sequence includes multiple video images usually taken at periodic intervals. The rate at which the pictures of frames are displayed is referred ...

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Abstract

The invention is related to methods and apparatus that advantageously improve bit rate control in a video encoder, such as an MPEG video encoder. One embodiment of the invention advantageously varies the targeted bit allocation for a picture to be encoded based on an occupancy level of a buffer model, such as a video buffer verifier (VBV) buffer model.

Description

RELATED APPLICATION[0001]This application is a Continuation patent application of co-pending application Ser. No. 10 / 452,769, filed on 30 May 2003.APPENDIX A[0002]Appendix A, which forms a part of this disclosure, is a list of commonly owned copending U.S. patent applications. Each one of the applications listed in Appendix A is hereby incorporated herein in its entirety by reference thereto.BACKGROUND OF THE INVENTION[0003]1. Field of the Invention[0004]The invention generally relates to video encoding techniques. In particular, the invention relates to adjusting a target number of bits to encode a picture based in part to achieve bit rate control and maintain buffer occupancy.[0005]2. Description of the Related Art[0006]A variety of digital video compression techniques have arisen to transmit or to store a video signal with a lower data rate or with less storage space. Such video compression techniques include international standards, such as H.261, H.263, H.263+, H.263++, H.264, ...

Claims

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Application Information

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IPC IPC(8): H04N7/12
CPCH04N19/159H04N19/176H04N19/149H04N19/115H04N19/152H04N19/14H04N19/137H04N19/142H04N19/124
Inventor KATSAVOUNIDIS, IOANNISHSU, KUO-WEIZHAO, LIFENG
Owner COREL CORP
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