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Periodic fringe imaging with structured pattern illumination and electronic rolling shutter detection

  • US 9,386,236 B2
  • Filed: 01/26/2015
  • Issued: 07/05/2016
  • Est. Priority Date: 01/26/2014
  • Status: Expired due to Fees
First Claim
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1. A method for digital imaging, the method comprising the steps of:

  • operating a digital light projector to produce two or more linear illumination patterns having a pre-defined illumination pattern duty cycle that is less than 100%;

    directing light from the two or more produced linear illumination patterns onto a target;

    directing light from the target to a two dimensional pixel array detector having a rolling shutter exposure functionality and a pre-defined exposure time;

    using a timing signal to control a spatial-temporal relationship between the rolling shutter exposure of the two dimensional pixel array detector and the two or more produced linear illumination patterns;

    detecting a first image having a periodic variation in spatial intensity by setting the exposure time of the two dimensional pixel array detector to less than ten times an illumination pattern period;

    adjusting a spatial-temporal relationship between the rolling shutter exposure of the pixel array detector and the two or more produced linear illumination patterns to detect one or more additional images having a change in at least one of an amplitude, frequency, or phase of a periodic variation in spatial intensity with respect to the first image; and

    combining the first image and the one or more additional images to create a composite image.

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