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Chapter 2 ■ Edge-Detection Techniques 81

colorEdge2.c Color edge detector

colorEdge3.c Color edge detector
eval1.c Pratt edge evaluation
eval2.c Rosenfeld edge evaluation

gnoise.c Adds Gaussian noise to an image
grad1.c Simple gradient edge detector
grad2.c Simple gradient edge detector
kirsch.c Kirsch edge detector

lib.c Basic code library
lib.h Library include file
maketmpl.c Builds edge evaluation images

marr.c Marr-Hildreth edge detector
measure.c Measure noise in an image
shen.c ISEF edge detector
sobel.c Sobel edge detector

canny.par Parameter file for Canny edge detector
shen.par Parameter file for ISEF edge detector
chess.jpg Test image, chessboard; JPEG version

chess.pgm Test image, chessboard; PGM version
chess_18.pgm Chess image, with noise mean = 18
chess_3.pgm Chess image, with noise mean = 3
chess_9.pgm Chess image, with noise mean = 9

et1.pgm Edge test image, vertical boundary
et1_18.pgm ET1 with noise mean = 18
et1_3.pgm ET1 with noise mean = 3

et1_9.pgm ET1 with noise mean = 9
et2.pgm Edge test image, horizontal boundary
et2_18.pgm ET2 with noise mean = 18
et2_3.pgm ET2 with noise mean = 3