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Method and apparatus for scaling compressed video bitstream

A technology of bit stream and video signal, used in digital video signal modification, TV, color TV, etc.

Inactive Publication Date: 2003-01-22
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since only the file server must be equipped with scaled-down hardware and not the individual users, complexity and cost are not critical factors

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  • Method and apparatus for scaling compressed video bitstream
  • Method and apparatus for scaling compressed video bitstream
  • Method and apparatus for scaling compressed video bitstream

Examples

Experimental program
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Embodiment Construction

[0018] Figure 1 shows a known apparatus for downscaling a compressed video signal for reducing the amount of data in a previously encoded video signal. In the arrangement shown, only the main functional components are shown for the general operation of the conveying circuit. For example a compressed video signal includes various data, only certain types of which are quantized. Other types bypass the requantization or downscaling means and remultiplex the downscaled data in a multiplexer (MUX) 14 . It will be apparent to one of ordinary skill in the art of compression circuits that multiplexer 14 must include not insignificant control circuitry to perform this function. However, those of ordinary skill in the art of compression circuits will be able to easily implement the multiplexing function of the multiplexer 14, so no further description will be given here.

[0019] In Figure 1, the previously compressed or encoded video signal to be downscaled is assumed to be a block-c...

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Abstract

A method and apparatus for scaling the bitstream of a compressed video signal includes partial decoding hardware (38, 41) to permit excising of higher frequency AC DCT coefficients or re-quantizing quantized data with a coarser quantization factor. The scaling is performed on a block (macroblock) basis in a manner which linearly scales the amount of compressed data per block. An analyzer (40) generates a profile of cumulative partially decompressed data over a video frame, and bitstream scaling (42) is performed in a manner which insures that a profile of the scaled signal substantially comports with the profile of the original data.

Description

field of invention [0001] The present invention relates to methods and apparatus for reducing the amount of data in a previously compressed video signal bitstream. Background technique [0002] For video transmission and storage in various application fields, the Moving Picture Experts Group (MPEG) video coding standard has been proposed. Certain applications, such as Video On Demand and Trick-Play on Track Digital VTR, are easier to implement with compressed signals having a bit rate lower than in established MPEG rules. ). Different applications have slightly different signal requirements, however similar downscaling means can be used to reduce the original bit rate to a rate that is useful for various applications. [0003] The MPEG encoding standard has been developed for a variety of applications, including worldwide high-definition television (HDTV), teleconferencing, satellite communications, direct broadcast system (DBS) and multimedia workstations. An MPEG-2 comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/765G06T9/00H04N5/92H04N7/26H04N7/50
CPCH04N19/00781H04N7/50H04N19/00187H04N19/00181H04N7/26191H04N19/00472H04N7/26941H04N19/149H04N19/15H04N19/61H04N19/40
Inventor W·郭J·W·兹迪普斯基H·辛
Owner SHIN ETSU CHEM IND CO LTD