Intensity view not true intensity

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zoltan
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Intensity view not true intensity

Post by zoltan »

The Intensity view in ReCap is not a true value of reflective intensity but is a grayscale version of the RGB data.

Here is the view of a point cloud in Scene 5.5.3.16. This is a poorly lit room, so it is very dark.
1.JPG
This is a Planar view of one of the scans.
2.jpg
This is the Intensity view of the point cloud in Scene.
3.JPG
This is the Planar view in Intensity.
4.jpg
Here is a view of the same point cloud in ReCap 3.1.0.12.
5.JPG
This is the RealView of the same scan as before.
7.JPG
This is the Intensity view of the point cloud in ReCap.
6.JPG
This is the RealView in Intensity.
8.JPG
Notice how the Intensity color mode in ReCap is not the Infrared Reflective Intensity but is merely a greyscale version of the color data.
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Re: Intensity view not true intensity

Post by JoshK »

what file format did you use to get the scan into Recap?
zoltan
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Re: Intensity view not true intensity

Post by zoltan »

FLS exported from Faro Scene.
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Re: Intensity view not true intensity

Post by Ryan »

I believe this was a bug in older versions of Scene - once the scan was colorized the SDK would no longer provide the true intensity. The data is just not there anymore.

Can you try bringing one of these raw scans directly into ReCap?

Ryan
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Re: Intensity view not true intensity

Post by zoltan »

So I'm dragging this post back up from a month ago because I finally had time to do a real test to see which workflows make this work and which do not.

I tested 5 different ways of getting Faro scans into ReCap and examined if the Intensity views were correct. This is using Faro Scene 6.2.0.31 and ReCap 360 3.1.0.12.

The first test was having ReCap index the scan data directly from the scanner's SD card without using Scene. Both the color view and Intensity view are shown correctly.
SD-ReCap-Color.JPG
SD-ReCap-Intensity.JPG
The next test is exporting an FLS file from Scene (Import/Export -> Export Scans - Ordered) and indexing it in ReCap. Here the color data had not yet been applied to the scan. Though the color data were not applied, ReCap still indexed the scan in color and the intensity view is correct.
FLS-Color.JPG
FLS-Intensity.JPG
The next test is to export a ReCap project directly from Scene (Import/Export -> Export as Project). Here, since colors had not been applied to the scan, ReCap did not index the color data and the color view shows the true intensity values. The intensity view also shows the true intensity data, but it seems to be missing the zero-distance points.
ReCap-Color.JPG
ReCap-Intensity.JPG
In the next two tests, the color data are applied to the scan (Operations -> Color/Pictures -> Apply Pictures).

Here, the FLS file is exported from Scene and indexed in ReCap. ReCap indexes the color data, but the intensity view does not show the true intensity values but instead shows a greyscale version of the RGB data.
FLS-Colorized-Color.JPG
FLS-Colorized-Intensity.JPG
The last test is to export the ReCap project from Scene after the color data have been applied. The color view shows the color data correctly, but the intensity view again shows incorrect intensity data and the zero-distance points are missing.
ReCap-Colorized-Color.JPG
ReCap-Colorized-Intensity.JPG
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Scott
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Re: Intensity view not true intensity

Post by Scott »

IMO, 'Intensity' (reflectivity) is more valuable than color for most of my scans projects -certainly for poorly lit interiors. It should be the default setting, rather than a mere viewing option. Why not make use of wave lengths (UV to IR) to the left and right of our visible spectrum to inform us of what's around us? It's nice to have color, but it's not always the most valuable slice of the light spectrum.
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Re: Intensity view not true intensity

Post by jedfrechette »

Scott wrote:IMO, 'Intensity' (reflectivity) is more valuable than color for most of my scans projects
+1
Jed
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