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Image encoding and transmitting system

  • US 5,510,839 A
  • Filed: 07/06/1992
  • Issued: 04/23/1996
  • Est. Priority Date: 07/04/1991
  • Status: Expired due to Term
First Claim
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1. An image encoding and transmitting system used in an image transmission system for dividing inputted frame image data into blocks comprising a plurality of picture elements, encoding said data in block units, and transmitting said encoded data in packet units, said system comprising:

  • a motion vector detector on a sending side of said image transmission system for detecting a motion vector for each of said blocks and sending said motion vector to a receiving side,an inverse discrete cosine transform unit on said receiving side for performing an inverse discrete cosine transform on received data,an adder for adding the present frame data as an output from said inverse discrete cosine transform unit to data obtained by multiplying the delay result obtained, by delaying data in the preceding frame according to a motion vector received from said sending side by a leak coefficient α

    ,a frame memory for storing an output of said adder,a motion compensation replacement unit (MC) for replacing the data for a block whose encoded data are not received due to packet-discard using a motion vector received from said sending side and the content stored in said frame memory when a packet discard detection signal is inputted,a variable delay unit for delaying an output from said frame memory according to a motion vector received from said sending side,a leak coefficient unit for multiplying an output from said variable delay unit by a leak coefficient α and

    outputting-the product to said adder.

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