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Circuit and method providing wide dynamic-range operation of auto-focus(AF) focus state sensor elements, digital imaging device, and computer system including same

  • US 9,392,160 B2
  • Filed: 06/20/2014
  • Issued: 07/12/2016
  • Est. Priority Date: 06/20/2014
  • Status: Active Grant
First Claim
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1. A method of adaptive auto-focusing of an image capture device, having a lens and an array of light sensors including plurality of pixels and a plurality of focus state detecting elements (FDels) to obtain lens focus state information, the method comprising:

  • selecting one of a first and second modes of the image capture device based on a measurement of a currently-detected property of a selected region of interest within a scene to be captured by the array of light sensors, wherein in the first mode the FDels in the array of light sensors are exposed for a loner exposure time than the plurality of pixels, wherein in the second mode the FDels in the array of light sensors are exposed for a shorter exposure time than the plurality of pixels; and

    obtaining lens focus state information corresponding to the selected region of interest by capturing light from the selected region of interest in a first and second FDels among the plurality of FDels, operated with the selected mode.

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