MATLAB: What the different between edge detection and morphologic operations of erosion and dilation,

Question

what the different between edge detection and morphologic operations of erosion and dilation,

Answer 1

Edge detection looks for local differences in gray levels and gives a high signal where there is a high difference.

Morphological dilation is the local max of the image and erosion is the local min of the image when you scan the image with a small window.