Projection display device and keystone correction method
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United States of America Patent
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Apr 23, 2013
Grant Date -
Mar 24, 2011
app pub date -
Sep 14, 2010
filing date -
Sep 18, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A projection display device includes: a projection section having an optical system; a parameter obtaining section adapted to obtain a first parameter corresponding to the projection angle showing a relative posture of the projection display device to the projection surface; a vanishing point calculation section adapted to calculate a position of a vanishing point based on the first parameter; an actual zoom ratio obtaining section adapted to obtain an actual zoom ratio; a parameter calculating section adapted to correct the first parameter based on a fixed reference zoom ratio and the actual zoom ratio to thereby calculate a second parameter; and a keystone correction section adapted to perform a keystone correction of the image based on the fixed reference zoom ratio and the second parameter.
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