H - Electricity – 04 – N
Patent
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.
Chung Hing Yip
Lee Chi Kin
Luo Tao
Mak Fuk Sang
Tsang Shiu Hang
Sim & Mcburney
Verint Systems Inc.
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