IMAGING DEVICE, EXTERNAL FLASH DETECTION METHOD, PROGRAM, AND INTEGRATED CIRCUIT

Title:

IMAGING DEVICE, EXTERNAL FLASH DETECTION METHOD, PROGRAM, AND INTEGRATED CIRCUIT

Document Type and Number:

WIPO Patent Application WO/2010/119669

Kind Code:

A1

Abstract:

When imaging a photographic subject by means of an imaging device using a CMOS image sensor, flashes of external light, such as from a flash, cause white band-shaped artifacts to appear in the image signal due to the movement of a rolling shutter. Processing an image with such an artifact or removing said artifact requires identifying the frame in which the artifact occurred. A line-averaging unit (11) is used to compute the mean luminance level for each line in an image signal; said levels are temporarily stored in a memory unit (12), and then a frame-differential computation unit (13) computes the difference between the mean luminance level of each line and the mean luminance level of the corresponding line in the subsequent frame. These frame differentials are compared to a reference value; attention is paid to areas in which the values are large, and where the change lasts for one frame, influence from an external flash is determined to have been present.

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Inventors:

FUKUSHIMA YASUSHI
INOUE TADAYUKI
KINIWA YUJI
FUKUI KATSUYUKI

Application Number:

PCT/JP2010/002676

Publication Date:

October 21, 2010

Filing Date:

April 13, 2010

Export Citation:

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Assignee:

PANASONIC CORP (JP)
FUKUSHIMA YASUSHI
INOUE TADAYUKI
KINIWA YUJI
FUKUI KATSUYUKI

International Classes:

H04N5/235; H04N5/238

Foreign References:

JP2007306225A	2007-11-22
JP2007166408A	2007-06-28
JP2009253367A	2009-10-29
JPH11355655A	1999-12-24
US20070140356A1	2007-06-21
US20080232765A1	2008-09-25

Other References: