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Image data compression or expansion method and apparatus, and image transmission system and monitoring system using the method and device

  • US 20040240744A1
  • Filed: 07/25/2003
  • Published: 12/02/2004
  • Est. Priority Date: 04/13/1998
  • Status: Active Grant
First Claim
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1. An image data compression apparatus, comprising:

  • compression processing means for conducting compression-processing on input image data and outputting compressed image data;

    image change detection means for detecting a change in an image of the input image data;

    frame rate control means for controlling a frame rate of the compressed image data such that the frame rate of a scene, in which the change in the image is small, comes to be lower than that of a scene, in which the change in the image is large, depending upon condition of changes in the image, detected by said image change detection means, wherein said frame rate control means is constructed with exchange means for controlling whether the input image data should be compressed and encoded by a predetermined unit, exchangeably.

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