Seam insertion with delta_col >= self.in_height

[thierrypin]

I've found an issue that happens when I want to double an image's size. I had no problem finding the bug:

In SeamCarver.seams_insertion, there is a loop which chooses the seams to insert by removing them from a copy of the image, storing in a list, and adding them in to the output. But self.delete_seam(seam_idx) crashes when it comes to the last column. It happens when num_pixel >= self.in_height.

for dummy in range(num_pixel): energy_map = self.calc_energy_map() energy_map[np.where(self.mask[:, :] > 0)] *= self.constant cumulative_map = self.cumulative_map_backward(energy_map) seam_idx = self.find_seam(cumulative_map) seams_record.append(seam_idx) self.delete_seam(seam_idx) self.delete_seam_on_mask(seam_idx)

I thought maybe when the image is small enough (how small, I don't know) it could just feed the list with its first seams in a cycle. Or it could proceed to add seams and go back to add the remaining columns.