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Method and system for detecting transitional markers such as uniform fields in a video signal

  • US 5,778,108 A
  • Filed: 06/07/1996
  • Issued: 07/07/1998
  • Est. Priority Date: 06/07/1996
  • Status: Expired due to Term
First Claim
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1. A method of detecting a uniform image in a digital video signal made up of a series of video images, comprising:

  • segmenting a plurality of the video images, each of the plurality of video images segmented into a first number of cells, each cell comprising a second number of pixels, a pixel having a pixel intensity value representing the intensity of the pixel;

    generating a plurality of cell contrast vectors each associated with one of the segmented video images, each element of the cell contrast vector associated with one of the cells and comprising the standard deviation of the pixel intensity values for the pixels in that cell;

    calculating the maximum cell contrast for each of the segmented video images, the maximum cell contrast for an image comprising the value of the largest element of the cell contrast vector for that image;

    generating a plurality of cell intensity vectors each associated with one of the segmented video images, each element of the cell intensity vector associated with one of the cells and comprising the average of the pixel intensity values for the pixels in that cell;

    calculating the maximum cell intensity for each of the segmented video images, the maximum cell intensity for an image comprising the value of the largest element of the cell intensity vector for that image; and

    generating a blank image detect signal for a video image if the maximum cell intensity for that video image is below a first threshold and the maximum cell contrast for that video image is below a second threshold.

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