Question 9
You are designing an edge detection pipeline for noisy grayscale images. For each of the following goals, choose the most appropriate filter or method:
1. Smooth out noise before any edge detection step
2. Detect edges by finding zero-crossings in the second derivative
3. Highlight regions with a strong intensity gradient
4. Perform basic edge detection with a simple directional gradient filter
1 → Gaussian filter, 2 → Laplacian of Gaussian, 3 → First derivative of Gaussian, 4 → Sobel operator
1 → Sobel operator, 2 → Gaussian filter, 3 → Laplacian of Gaussian, 4 → First derivative of Gaussian
1 → First derivative of Gaussian, 2 → Sobel operator, 3 → Gaussian filter, 4 → Laplacian of Gaussian
1→Laplacian of Gaussian, 2→First derivative of Gaussian, 3→Sobel operator, 4→Gaussian filter