Published November 18, 2020
Late last night I was greeted in my dreams by a green, ghastly spectre, who said unto me: "Instead of adding 1 image at a time, did you try stitching 2 and 2, then the two composites? This would greatly reduce the distortion suffered by the latter images," in a spooky voice. I said "No I didn't think of that," then woke up and tried it. It immediately looked way better. Here's the results
I think due to the distortion being lessened, the total features being found are much better for the two pairs than for adding one image at a time. Here's an example of the keypoints being connected across.
I guess divide and conquer really has its merits.