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Apparatus and method of processing image

  • US 5,523,958 A
  • Filed: 06/10/1993
  • Issued: 06/04/1996
  • Est. Priority Date: 06/10/1992
  • Status: Expired due to Term
First Claim
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1. A video processing apparatus, usable with a computer system comprising:

  • a processor for performing logical operation, a first video memory for storing first video data, a display controller for generating a first analog video signal from said first video data stored in said first video memory and a first synchronizing signal for said first analog video signal, and display means for displaying a video image;

    said video processing apparatus superimposing a moving video image represented by a second analog video signal upon at least part of a first video image represented by said first analog video signal, said video processing apparatus comprising;

    an A-D converter for converting said second analog video signal representing a moving picture into second video data;

    a second video memory for storing said second video data;

    write control means for writing said second video data into said second video memory in synchronism with a second synchronizing signal for said second analog video signal;

    a memory for storing color range data defining a predetermined range of chromaticity having an upper limit value and a lower limit value;

    read control means for reading out said second video data from said second video memory in synchronism with said first synchronizing signal;

    color comparator means for comparing said second video data read out by said read control means with said color range data to generate a color comparison signal indicating whether a value of said second video data is in said predefined range of chromaticity;

    a D-A converter for converting said second video data read out by said read control means into a third analog video signal representing a moving picture in synchronism with said first synchronizing signal; and

    a video switch for selecting one of said first analog video signal and said third analog video signal in response to said color comparison signal, and outputting said selected video signal to said display means to display a composed image in which the moving picture represented by said third analog video signal is superimposed in the first video image represented by said first analog video signal.

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