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- pgmedge(1) AMIGA (04 February 1990) pgmedge(1)
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- NAME
- pgmedge - edge-detect a portable graymap
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- SYNOPSIS
- pgmedge [pgmfile]
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- DESCRIPTION
- 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.
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- 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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- SEE ALSO
- pgmenhance(1), pgmtopbm(1), pgm(5), pbm(5)
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- AUTHOR
- Copyright (C) 1991 by Jef Poskanzer.
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- Page 1 (printed 10/19/91)
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