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Methods and apparatus for automatic exposure control

DC
  • US 7,148,923 B2
  • Filed: 07/11/2001
  • Issued: 12/12/2006
  • Est. Priority Date: 09/30/2000
  • Status: Expired due to Term
First Claim
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1. An imaging device for capturing optical image data, the device comprising:

  • an imager for generating an image signal;

    a memory component that receives the image signal from the imager and stores the image signal as image data;

    a processor operating according to a multi-tasking operating system;

    a histogram processing module executed by the multi-tasking operating system as a low priority task that analyzes the image data in the memory component and calculates a target contrast; and

    an imager control module executed by the multi-tasking operating system concurrently with the histogram processing module, the imager control module being executed as a high priority task that sets a gain and exposure for the imager based on the target contrast calculated by the histogram processing module.

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