Methods and systems for computing an alpha channel value
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United States of America Patent
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Jul 18, 2017
Grant Date -
Mar 10, 2016
app pub date -
Sep 8, 2014
filing date -
Sep 8, 2014
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Abstract
Methods and systems for computing an alpha channel value are provided. In one embodiment, a set of parameters is obtained based on an effect (transformation) to be applied to a source image. A value is also obtained that defines a uniform width of an area that borders at least one boundary of the transformed source image in the target image. For a target image pixel coordinate in the area, a corresponding source pixel coordinate is computed that is within another non-uniform area bordering the source image. An alpha channel value defining semi-transparency of a pixel associated with the target image pixel coordinate is computed as a function of a location of the corresponding source pixel coordinate in the another area bordering the source image.
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