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AUTO-FOCUS CONTROL USING IMAGE STATISTICS DATA WITH COARSE AND FINE AUTO-FOCUS SCORES

  • US 20120051730A1
  • Filed: 09/01/2010
  • Published: 03/01/2012
  • Est. Priority Date: 09/01/2010
  • Status: Active Grant
First Claim
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1. An image signal processing system comprising:

  • a front-end pixel processing unit configured to receive a frame of raw image data comprising pixels acquired using an imaging device having a digital image sensor, wherein the front-end pixel processing unit comprises a statistics collection engine having auto-focus statistics logic configured to process the raw image data to collect coarse and fine auto-focus statistics; and

    control logic configured to determine an optimal focal position of a lens of the imaging device using coarse and fine auto-focus scores based upon the coarse and fine auto-focus statistics and to adjust the focal position of the lens between a minimum position and a maximum position defining a total focal length to reach the optimal focal position.

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