Figure 1 Original (left) and blurred (right), full padding mode.

Figure 2 Original (left) and blurred (right), valid padding mode.

Figure 3 Original (left) and blurred (right), same padding mode.

Figure 4 Image 'coins.png' and its gray level distribution.

Figure 5 Image 'coins.png' and a segmented image thresholded at 128.

Figure 6 Segmented image 'coins.png' thresholded with Otsu's algorithm, and the difference between it and the one from the manual thresholding. Otsu threshold is computed to be 125.

Figure 7 Original image (left) and its gradient magnitude (right).

Figure 8 Horizontal gradient (left) and vertical gradient (right).

Figure 9 Thresholded gradient magnitude (left), seam outline (right).

Figure 10 Thresholded original image (left), seam (right).