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- pgmedge(1) Unix Programmer's Manual pgmedge(1)
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- NNNAAAMMMEEE
- pgmedge - edge-detect a portable graymap
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- SSSYYYNNNOOOPPPSSSIIISSS
- pppgggmmmeeedddgggeee [_p_g_m_f_i_l_e]
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- DDDEEESSSCCCRRRIIIPPPTTTIIIOOONNN
- Reads a portable graymap as input. Outlines the edges, and writes a
- portable graymap as output. Piping the result through pppgggmmmtttooopppbbbmmm
- ---ttthhhrrreeessshhhooolllddd 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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- SSSEEEEEE AAALLLSSSOOO
- pgmenhance(1), pgmtopbm(1), pgm(5), pbm(5)
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- AAAUUUTTTHHHOOORRR
- Copyright (C) 1991 by Jef Poskanzer.
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- 04 February 1990 1
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