Edge Detection in Digital Images Using Dispersive Phase Stretch Transform

Figure 3

Qualitative comparison of the performance of the proposed method for edge detection (a) to the Sobel (b) and Canny (c) methods. Image under analysis is the “Lena” image with 512 × 512 pixels. For the proposed method, designed parameters are phase strength , phase warp , localization kernel bandwidth , and binary threshold = 0.028. Designed threshold value for Sobel method is 7.9 and designed parameters for Canny method are sigma = 1.28, low threshold = 0.024, and high threshold = 0.117.

(a) Proposed method, phase strength , and warp

(b) Sobel: Thresh = 7.9

(c) Canny: sigma = 1.28; Thresh (min, max) =