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pgmedge - edge-detect a portable graymap |
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pgmedge [pgmfile] |
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Reads a portable graymap as input. Outlines the edges, and writes a portable graymap as output. Piping the result through pgmtopbm -threshold and playing with the threshold value will give a bitmap of the edges. The edge detection technique used is to take the Pythagorean sum of two Sobel gradient operators at 90 degrees to each other. For more details see "Digital Image Processing" by Gonzalez and Wintz, chapter 7. |
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pgmenhance(1), pgmtopbm(1), pgm(5), pbm(5) |
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Copyright (C) 1991 by Jef Poskanzer. |
