Weprocessedin3steps first wecreate a filter oftheedge

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Unformatted text preview: inches on the table to squares on the table, so the mapping problem was solved. ­To find the letter an edge filter was applied over the letter… To find the letter T we have chosen to use edges because we were thinking that edge present invariance on the table. We processed in 3 steps: First, we create a filter of the edge of the letter that we are looking for. We take a small picture of the letter on the table with our camera and we apply Sobel operators to detect edges. Sobel operators are explained in the step 2. Then we applied edge detector to the all table. To compute a discrete approximation to the gradient, we used Sobel operators too, we have convolved the image of the table with 2 masks. They detect vertical and horizontal edges, respectively. 1 0 1 2 0 2 1 0 1 and 1 2 1 0 0 0 1 2 1 And finally we convolute the matrix resulting from step 2 with the filter. The maximum value should be the letter. But when we try we do not find the letter but some point in the border. Indeed the border has two main particular...
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