Question: How to answers above problems based on data science image processing with details explanations? 1. Sobel Operator is smoothing filter (1st derivative) but give more

How to answers above problems based on data science image processing with details explanations?
1. Sobel Operator is smoothing filter (1st derivative) but give more thicker edge (at ramp edges) and let as is the areas of flat intensity. The first kernel is for more thicker at line and the second for thicker at line. 2. What the purposes of zero crossing in 2 nd derivative
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