Hirpa SciML Academy

Look at a fruit picture. The EDGE is where red suddenly becomes green or yellow. Draw a 3x3 window around one edge pixel. Count how many inside pixels touch the center. Now count how many outside pixels touch the center. If inside = 5 and outside = 4, the center is probably an EDGE. Computers find edges the same way: they count neighbors in a tiny window.

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🔍 Fruit Edge Detector

Pick a fruit, then apply the edge detector kernel to find its outline!

Original Fruit

After Edge Detection

The kernel slides over every pixel. If a pixel and its neighbors are all the same (inside the fruit), they cancel out (sum = 0). At the EDGE, neighbors are different, so the sum is NOT zero. That's how the computer finds the outline!

Your edge detector is a convolution. Face unlock on a phone runs a version of this math billions of times. Next you will use edges and other features to decide: apple or orange?