Apparatus and method for performing shading correction by multiplying a differential shading correction factor and input image data
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United States of America Patent
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Jul 21, 1998
Grant Date -
N/A
app pub date -
Aug 15, 1995
filing date -
Aug 18, 1994
priority date (Note) -
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Abstract
Shading correction is achieved with high precision while reducing the amount of data representing a correction factor for shading correction. A correction factor C(x-1) at a pixel address 'x-1' is held in a latch circuit. The correction factor C(x-1) is fed to an adding circuit through a changeover switch. A differential correction factor V(x) representing the difference between the correction factor C(x-1) for a pixel addressed by 'x-1' and a correction factor C(x) for a pixel addressed by 'x' is read out from a differential correction factor memory, and is fed to the adding circuit. The correction factor C(x-1) and the differential correction factor V(x) are added together in the adding circuit, and data obtained by the addition C(x-1)+V(x) is outputted as the correction factor C(x) at a pixel address 'x'.
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