IMAGE SIGNAL PROCESSING APPARATUS AND IMAGE SIGNAL PROCESSING METHOD
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United States of America Patent
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Issued Date -
Aug 8, 2013
app pub date -
Feb 6, 2013
filing date -
Feb 6, 2012
priority date (Note) -
Abandoned
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Abstract
An image signal processing apparatus is disclosed. This device includes a divided area setup unit which sets rows and columns of divided areas in an area defined by a focal evaluation value calculation area setup unit, a high-brightness pixel presence/absence check unit which determines whether a high-brightness pixel exists in each divided area defined by the divided area setup unit, a high-brightness pixel judgment threshold setup unit which sets a threshold for use in the high-brightness pixel presence/absence checker, and an area-selective focal point evaluation value calculation unit which selects a divided area that was determined by the high-brightness pixel checker to contain no high-brightness pixels as a focal evaluation value calculation target and then calculates a focal evaluation value. Variable control of the high-brightness pixel judgment threshold that is set by the high-brightness pixel judgment threshold setup unit is started and stopped at specified timings.
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