Bogus control points : 無料・フリー素材/写真
Bogus control points / selkovjr
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Previous: Automatic alignmentThe algorithm for finding control points is extremely robust, but it can fail in two ways: it can fail to find a pair of points, and it can pair similar points found in the wrong locations.I have noticed that it is especially prone to failure if the images were shot with different lenses and have different fields of view. That certainly affects the pixel structure of the control point areas, making it more difficult to match them.In this case, the left frame was shot with the focal distance of 6.2 mm, and the right frame was shot at 8.6 mm. The point number 4 in this pair, although it shows very similar colours and is found in the same vicinity on both images, shows almost entirely dissimilar paterns and is probably bogus.Another defect of the control point assignment shown here is that the points are clustered in a relatively small area. That is normally not a problem; if the frames are shot with the same calibrated lens without parallax, it is enough to have one or two control points to stitch the frames without any defects. But in this case, different fields of view and a serious parallax compound the problem.Next: No control points |
| 撮影日 | 2010-08-04 13:02:21 |
| 撮影者 | selkovjr , Chicago, Illinois |
| タグ | |
| 撮影地 |