I would like to use the MINI 2 to show you how to scan hard-to-reach areas of an object.
This is not only for the Mini 2 - but especially when scanning very small objects that are very angled, you always have places that are very difficult to scan.
I would like to use a small example here to show a method for capturing certain areas better.
If you scan this figure in the classic way, you can see that certain areas are not captured in the result:
Position of the scanner:
The area circled in red shows which areas the scanner could not “see”.
To be able to scan these areas as well, you can rotate the scanner by 90 degrees.
It will look like this:
The result if you scan the figure like this is as follows:
Of course, there may be other areas that are not captured in this orientation - but if you combine both scans, you get the data from both scans:
The reason why it makes such a difference if you turn the scanner 90 degrees is because of the way the scanner gets its data.
Here is an example of the whole thing - (here I use a cup because the whole thing comes from an animation I prepared a long time ago)
The projector projects a pattern onto the object:
The pattern is then captured with the left camera:
and the right camera:
In order to calculate the 3D data from this, it is important that the pattern is projected onto the area to be captured by the projector and that the area is seen by the right AND left camera.
To make the whole thing clearer, here from the scanner’s point of view: I have shown the projector as a green light source, the right camera as a red light source and the left camera as a blue light source.
If you now combine all 3 views, you can see which areas fulfill the requirements - they are displayed in white:
This means that only the white area can be captured in this frame.
Now transfer this to the situation where you have crevices that are difficult to reach (as with the figure).
Let me illustrate this with a model of a small vacuum cleaner filter:
when the scanner is aligned horizontally:
you can see that the inside of the crevices cannot be completely captured.:
If you now turn the scanner by 90 degrees:
you can see that the end of the crevices is also captured
So - that was a bit longer now - but I hope it can help some of you