Method to perform sobel calculations and normalization for auto-focus in a digital camera
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United States of America Patent
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Issued Date -
Sep 1, 2011
app pub date -
Mar 1, 2010
filing date -
Mar 1, 2010
priority date (Note) -
Abandoned
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Abstract
A focus motor of a digital camera is moved to a point of focus from which image data is integrated and evaluated for sharpness and luminance. When the focus motor is stopped, a delay is initiated to allow integration of the image data from which a Sobel value and a luminance value are determined to allow the calculation of a focus value to be calculated from the ratio of the Sobel value to the luminance value. Once the focus value is calculated, the next motor position is determined from which a next focus value is determined.
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