Methods and apparatus for defining contours in colored images
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United States of America Patent
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Dec 15, 1992
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N/A
app pub date -
Sep 11, 1991
filing date -
Sep 14, 1990
priority date (Note) -
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Abstract
A method and apparatus for defining a contour in a colored image to separate a selected region having a selected color or colors from other regions when the color component content of each pixel of the image is defined by digital data at a first resolution. The method comprises defining a region of the image containing colors which are to be located in the selected region and for each of the pixels in the defined region deriving a digital color component representation at a second resolution higher than the first resolution by combining color component data from one or more adjacent pixels. Each digital color component representation at a second resolution is then designated as a selected color value. An edge following algorithm is performed to define a contour within the image by deriving a digital color component representation at a second resolution for each pizel under consideration, as before, determining whether each digital color component representation is a selected color value and designating a pixel as lying on the contour by reference to the arrangement of neighboring pixels having selected color values.
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