Can/are gradient detectors/detection filters be used as an edge detection system? (Because, as the slide states, we can think of the filter as a "detector" of a pattern, in which for our case would be an "edge" in an image)

@tmdals yes I believe they can, as edge detection would typically manifest itself as detecting extreme values in the gradient - i.e when an images changes values really quickly, we have probably crossed an edge. For example, the horizontal gradient operator we discussed can be used to detect vertical edges. See https://www.cis.rit.edu/people/faculty/rhody/EdgeDetection.htm for more details.

If we applied the vertical gradient then the horizontal gradient (or vice versa) on this particular image, would it lead to a black image? Not the best at graphics but just curious ahaha

What is the point of getting these gradients? I don't really see where the edge detection comes into play?