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Low resolution acquisition method and device for controlling a display screen

  • US 20040263497A1
  • Filed: 05/25/2004
  • Published: 12/30/2004
  • Est. Priority Date: 12/17/2001
  • Status: Abandoned Application
First Claim
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1. Process for checking a display screen comprising the following steps:

  • a) the screen (E) to be checked is controlled so as to display at least one test pattern with at least one spatial period P, b) acquisition of a sequence of simple images (I) of the test pattern using an electronic camera (12) with a definition lower than the definition of the screen to be checked, the successive simple images being offset from each other, c) construction of an over sampled image (S) of the test pattern starting from the simple images, d) calculation of spectral components of the over sampled image using a first Fourier transform, e) compensation of spectral alterations resulting from the previous steps by deletion and/or weighting of spectral components, f) calculation of spatial components of a new image of the test pattern using a second Fourier transform of the spectral components resulting from step e), g) analysis of the new image.

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