Patent ID: 8441551

Claim:
An apparatus comprising: a CMOS imaging sensor with a rolling shutter configuration; and circuitry operative to: compare a first frame captured by the CMOS imaging sensor with a second frame captured by the CMOS imaging sensor to determine misalignment of scene content between the frames; produce a realigned second frame by realigning the second frame with the first frame if they are determined to be misaligned; use luminance data from the realigned second frame and luminance data from the first frame to determine if an undesired flicker condition exists and if so, adjusting an exposure time of the CMOS imaging sensor to reduce flicker; and determine misalignment of scene content between the frames by projecting the first frame into a column to produce a first column projection, projecting the second frame into a column to produce a second column projection, and calculating a cross-correlation value between the first and second column projections.