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- ppppggggmmmmeeeeddddggggeeee((((1111)))) XXXXEEEENNNNIIIIXXXX SSSSyyyysssstttteeeemmmm VVVV ((((00004444 FFFFeeeebbbbrrrruuuuaaaarrrryyyy 1111999999990000)))) ppppggggmmmmeeeeddddggggeeee((((1111))))
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- NNNNAAAAMMMMEEEE
- pgmedge - edge-detect a portable graymap
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- ppppggggmmmmeeeeddddggggeeee [_p_g_m_f_i_l_e]
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- Reads a portable graymap as input. Outlines the edges, and
- writes a portable graymap as output. Piping the result
- through ppppggggmmmmttttooooppppbbbbmmmm ----tttthhhhrrrreeeesssshhhhoooolllldddd 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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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- pgmenhance(1), pgmtopbm(1), pgm(5), pbm(5)
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- AAAAUUUUTTTTHHHHOOOORRRR
- Copyright (C) 1991 by Jef Poskanzer.
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- Page 1 (printed 9/7/93)
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