> As for our case, we need to apply edge detection in order to find the edges of documents in order for our Document Scanner SDK to detect the document in real

> As for our case, we need to apply edge detection in order to find the edges of documents in order for our Document Scanner SDK to detect the document in real time and scan it. I've seen some kind of edge detection also used in software used in automated KYC/AML pipelines, to detect obvious cut/paste in utility bills / passport scans etc. Forgot the name of the (commercial) software but it's a thing. It's of course possible to fool these but a great many dumb copy/paste which do look perfect to a human will actually become obvious after applying simple edge detection. FWIW Gimp has Sobel edge detections for sure (don't know about the others), so you can "play" with edge detection if you're on Linux.