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Hugin 101: Setting Control Points Manually


A version of hugin that does not have automatic control point (CP) detection ships with the Nodal Ninja while we are waiting for the outcome of a Google Summer of Code project to produce the second part of a completely patent-free CP generator. Nevertheless, using it is easy. Because manual CPs are more important in hugin than in commercial stitching tools, the mechanism to set them has been engineered to be as efficient as possible. Once you get used to it, it is really just two approximate clicks and one right-click.

This is a beginner’s tutorial for how to manually set control points in hugin, but it is also useful for the pros dealing with a difficult stitch that require careful manual placement of CPs.

Initially, hugin Nodal Ninja Special Edition starts with the assistant.

Click on the 1. Load Images… button, select some images and open them.

If you try to click on the 2. Align… button, you will see a notification and the process will end.

If after dismissing the notification you are not on the control points tab, please select it. Make sure the checkboxes auto fine-tune and auto estimate are set.

The process in a nutshell:

  • click on the approximate position of the CP on the left image.
  • click on the approximate position of the CP on the right image.
  • right-click to add the point to the list.
  • repeat until you have enough CPs.

In detail:

When you click on the left CP, hugin will zoom in on it. Once zoomed, you may displace the CP to a precise position intended, but this is not necessary.

When you click on the right CP, just make sure that the box surrounding the mouse pointer also surrounds the area where the CP should be located. Hugin automatically fine-tunes inside that box, so that even if the left CP was not in the precise position intended, both CPs match the same position.

Fine tuning also kicks in after moving one of the points. And if for any reason fine tuning does not find the corresponding point, it will give a warning.

When the control point is where you want it, right-click and it will be added to the list of control points. Repeat until you have enough control points. Then select the next image pair and repeat for all adjacent image pairs. Simple, isn’t it?

One Response

  1. If you have a fisheye lens, you also need to consider this.

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