SYSTEMS, METHODS, AND DEVICES FOR FLASH EXPOSURE CONTROL USING PREFLASH STATISTICS

  • US 20110298947A1
  • Filed: 06/03/2010
  • Published: 12/08/2011
  • Est. Priority Date: 06/03/2010
  • Status: Active Grant
First Claim
Patent Images

1. A method comprising:

  • gathering, using data processing circuitry, first image capture statistics based at least in part on first image data captured by image capture circuitry while a strobe is not emitting light, wherein the first image capture statistics include a first luma value and first autoexposure control statistics;

    emitting a preflash using the strobe;

    gathering, using the data processing circuitry, second image capture statistics based at least in part on second image data captured by the image capture circuitry while the preflash is being emitted, wherein the second image capture statistics include a second luma value and second autoexposure control statistics;

    determining, using the data processing circuitry, third autoexposure control statistics based at least in part on the first luma value normalized to the first autoexposure control statistics and the second luma value normalized to the second autoexposure control statistics;

    emitting a main flash using the strobe; and

    capturing, using the image capture circuitry, an image based at least in part on the third autoexposure control statistics while the main flash is being emitted.

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