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Median-based dark level acquisition for a frame rate clamp

  • US 6,909,460 B2
  • Filed: 07/25/2001
  • Issued: 06/21/2005
  • Est. Priority Date: 07/25/2001
  • Status: Expired due to Term
First Claim
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1. A circuit for determining median dark level of an image sensor, the circuit comprising:

  • (a) a first circuit for comparing a current pixel value and a cumulative median;

    (b) a storage element for storing the cumulative median level; and

    (c) a second circuit which utilizes the first circuit for adjusting the cumulative median based on the current pixel level input for updating the cumulative median dark level.

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