Question: The Laplace edge detection method uses a 3 x 3 template for each image pixel: 1 . Multiply each original pixel by 4 and subtract

The Laplace edge detection method uses a 3x3 template for each image pixel:
1. Multiply each original pixel by 4 and subtract the 4 neighboring pixels, ignoring a one-pixel-wide border around the image.
2. Each absolute numeric edge value greater than a threshold is an edge (1), all others are not (0). All borders are no edges (0).

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