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pgmedge.1
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1995-07-25
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2KB
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67 lines
ppppggggmmmmeeeeddddggggeeee((((1111)))) XXXXEEEENNNNIIIIXXXX SSSSyyyysssstttteeeemmmm VVVV ((((00004444 FFFFeeeebbbbrrrruuuuaaaarrrryyyy 1111999999990000)))) ppppggggmmmmeeeeddddggggeeee((((1111))))
NNNNAAAAMMMMEEEE
pgmedge - edge-detect a portable graymap
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
ppppggggmmmmeeeeddddggggeeee [_p_g_m_f_i_l_e]
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.
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.
SSSSEEEEEEEE AAAALLLLSSSSOOOO
pgmenhance(1), pgmtopbm(1), pgm(5), pbm(5)
AAAAUUUUTTTTHHHHOOOORRRR
Copyright (C) 1991 by Jef Poskanzer.
Page 1 (printed 9/7/93)