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54    Chapter 2 ■ Edge-Detection Techniques


                                Canny               ISEF              Canny               ISEF




                                           ET1                                 SNR = 2






                                         SNR = 6                               SNR = 1






                                         SNR = 2                                 ET3







                                         SNR = 1                               SNR = 6






                                           ET2                                 SNR = 2







                                         SNR = 6                               SNR = 1



                           Figure 2.16: Side-by-side comparison of the output of the Canny and Shen-Castan (ISEF)
                           edge detectors. All of the test images from figure 2.8 have been processed by both
                           algorithms, and the output appears here and on the next page.
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