Distance calculating method and imaging device
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United States of America Patent
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Jan 8, 2008
Grant Date -
Aug 21, 2003
app pub date -
Jan 23, 2002
filing date -
Jan 23, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A distance calculation method and an imaging device that can be applied to a digital camera. The method includes calculating a distance between a point corresponding to an optical axis of a lens sub-system of the imaging device and an input point, and using the calculated distance to correct defects such as shading that occur in formed images due to peripheral light fall-off in the lens sub-system. The distance is approximated by a polygon having five or more sides, preferably having 8 or 16 sides. The distance is calculated by a disclosed function having constant coefficients, so that distances can be calculated by simple hardware.
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