ml-recall

#summed-area-table

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mediumAI-checkedComputer Vision Basics

The summed-area table (integral image) of an image stores in $S[r, c]$ the sum of all pixels in rows $\le r$ and columns $\le c$ (counting from 0). For one image, $S[0, 0] = 3$ , $S[0, 3] = 9$ , $S[2, 0] = 13$ and $S[2, 3] = 52$ . What is the sum of the pixels in rows 1–2 and columns 1–3?

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