Let us illustrate the above algorithm using a concrete example. As shown in Fig. 13.4.2 (left), assuming that the maximum value in matrix X is r23, we assign the ground-truth bounding box B3 to the...

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Extracted text: Let us illustrate the above algorithm using a concrete example. As shown in Fig. 13.4.2 (left), assuming that the maximum value in matrix X is r23, we assign the ground-truth bounding box B3 to the anchor box A2. Then, we discard all the elements in row 2 and column 3 of the matrix, find the largest r7ı in the remaining elements (shaded area), and assign the ground-truth bounding box Bị to the anchor box A7. Next, as shown in Fig. 13.4.2 (middle), discard all the elements in row 7 and column 1 of the matrix, find the largest r54 in the remaining elements (shaded area), and assign the ground-truth bounding box B4 to the anchor box A5. Finally, as shown in Fig. 13.4.2 (right), discard all the elements in row 5 and column 4 of the matrix, find the largest 92 in the remaining elements (shaded area), and assign the ground-truth bounding box B2 to the anchor box Ag. After that, we only need to traverse through the remaining anchor boxes A1, A3, A4, A6, As and determine whether to assign them ground-truth bounding boxes according to the threshold. Ground-truth bounding box indices 1 2 3 4 2 3 4 1 3 4 1 2 X23 X23 3 Anchor 4. box indices X54 X54 7 9. X92 Fig. 13.4.2: Assigning ground-truth bounding boxes to anchor boxes.