Transcoding system using encoding history information

A coding and video coding technology, which can be used in image communication, digital video signal modification, television, etc., and can solve problems such as image quality deterioration.

Inactive Publication Date: 2006-12-20
SONY CORP
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  • Abstract
  • Description
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Problems solved by technology

Therefore, decoding and encoding processes result in image quality degradation
Thus, there is a problem that image quality deterioration occurs every time encoding an

Method used

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  • Transcoding system using encoding history information
  • Transcoding system using encoding history information
  • Transcoding system using encoding history information

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[0088] Before describing the transcoder provided by the present invention, the process of compressing and encoding a moving picture video signal is explained. It should be noted that the technical term 'system' used in this specification refers to an entire system including a plurality of devices and means.

[0089] As described above, in systems for transmitting moving picture video signals to remote destinations such as video conference systems and video telephone systems, the video signals are subjected to compression and encoding processing using line correlation and intraframe correlation of the video signals to allow highly efficient use of transmission line. By utilizing row correlation, a video signal can be compressed by performing typical DCT (Discrete Cosine Transform) processing.

[0090] By utilizing intra-frame correlation, the video signal can be further compressed and encoded. Suppose frame images PC1, PC2 and PC3 are respectively in figure 1 This occurs at ...

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Abstract

The present invention provides a transcoder for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process based on MPEG standards. According to the transcoder provided by the present invention, encoding parameters generated in a past encoding process can be transmitted to the MPEG encoder which performs a present encoding process as a history information. And optimum encoding parameters in commensurate with the present encoding process are selected from the transmitted encoding parameters, and the selected encoding parameters are reused in the present encoding process. As a result, the picture quality does not deteriorate even if decoding and encoding processes are carried out repeatedly.

Description

[0001] This patent application is a divisional application of the following patent application: [0002] Application number: 200410088170.6 [0003] Application date: March 10, 1999 [0004] Title of Invention: Code Conversion System Using Code History Information technical field [0005] The present invention relates to a transcoding system, a video encoding device, a data stream processing system, and a system for changing the GOP (Group of Pictures) structure and the bit rate of an encoded bit stream obtained as a result of encoding processing based on the MPEG (Moving Picture Experts Group) standard Video decoding device. Background technique [0006] In recent years, broadcasting stations for producing and broadcasting television programs are generally using MPEG technology for compressing and encoding video data. In particular, MPEG technology is becoming a de-facto standard for recording video data on magnetic tapes or random access recording media and for transmit...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N19/12H04N19/40H04N19/61
Inventor 田原胜己村上芳弘北村卓也三原宽司
Owner SONY CORP
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