Systems and methods for triggering an out of focus alert
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United States of America Patent
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Dec 2, 2014
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N/A
app pub date -
Dec 31, 2012
filing date -
Jul 31, 2007
priority date (Note) -
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Abstract
In order to trigger an out of focus alert when the focus level of a video frame meets a focus criteria, a method is performed including the operations of: receiving a video frame, partitioning the video frame into a plurality of blocks, calculating an array of discrete cosign transformation (DCT) coefficients for at least one of the plurality of blocks using a DCT, classifying each of the at least one of the plurality of blocks based on the array of DCT coefficients for that block, calculating a focus level of the video frame from the block classifications, and triggering an out of focus alert if the focus level meets a focus criteria.
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