Systems and methods for triggering an out of focus alert

Details Systems and methods for triggering an out of focus alert Systems and methods for triggering an out of focus alert

H - Electricity

04

N

H04N 5/232 (2006.01) G03B 13/18 (2006.01) H04N 17/00 (2006.01)

Patent

CA 2627728

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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