FARO Laser-HDR still need some optimization

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Raimund58
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FARO Laser-HDR still need some optimization

Post by Raimund58 » Tue Sep 04, 2018 10:15 am

Screenshot.png
Screenshot.png
But I love this feature :D
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:)

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Re: FARO Laser-HDR still need some optimization

Post by flohrd » Tue Sep 04, 2018 12:52 pm

Thank you for the feedback. I am glad that you like the feature and I really do appreciate when opportunities for improvement are pointed out. While you do see much more in the resulting image, this featute exaggerates the images quite a bit and unfortunately it may also make things like the 180° mark more visible that were more sublte in the original image. You will see improvements of this over time for sure!

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Re: FARO Laser-HDR still need some optimization

Post by lyoung » Tue Jul 02, 2019 12:15 am

Hi All,
As a follow up to Raimund58, we have noticed a rather frustrating (for our purpose) side effect of laser HDR.
It is great at adjusting the imagery to be better lit and have a greater dynamic range, we have however noticed that when you run the laser HDR routine in Scene that not only is the imagery affected by the laser intensity but inversely the intensity is impacted (to its detriment) by the imagery (see images below). I have imported into several different software programs to ensure it wasn't an import or export issue into one particular program.
Faro Laser HDR Photo Colouring Applied - Intensity In RECAP.JPG
Faro Regular Photo Colouring Applied - Intensity In RECAP.JPG
The main reason this caused issue for us is that we were using the laser scanning to extract the road linemarking, which you can see stands out extremely well when normal photo colouring is applied to the point cloud, but when you apply laser HDR the linemarking become the same intensity as the majority of the roadway itself. In addition you can see the shadows from structures burnt into the intensity of the point cloud this is very noticeable in the middle of the image where you can see the shadow of the traffic light arm burnt onto the roadway.


I would love to hear any commentary on what may be causing this, if we are doing something wrong of if other people have noticed this issue.

Thanks in advance,
Lachlan.
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Re: FARO Laser-HDR still need some optimization

Post by pomped » Tue Jul 02, 2019 2:39 pm

Hi Lachlan,

I can only imagine two explanations:
1. A bug in SCENE during colorization because gray values should stay untouched.
2. An unexpected behavior of RECAP. Maybe RECAP does not use the original reflectance values but computes gray values from the color values?

In SCENE you can do the following to check if the gray values actually are changed:
1. Before colorization: Open a planar view on one affected scan and hover with your mouse over certain areas that you expect to be changed during colorization. In the bottom right corner you can see the reflectance values (e.g. RF: 1186). Make some notes for later comparison.
2. Colorize the scan and save the project.
3. Open a planar view on the same scan (either set loading behavior in settings to load gray values directly or switch to gray values with the "Color Mode" button in the Explore category).
4. Compare the gray values to your notes.

Please report back about your findings.

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Re: FARO Laser-HDR still need some optimization

Post by sreed » Tue Jul 02, 2019 2:50 pm

I cannot contribute much to this interesting thread, but Recap has never handled intensity views properly from my experience. I don't think it has anything to do with the HDR or Scene's new intensity enhanced colorization. If we scan in color and an area of the scan is blown out and over-exposed, the intensity view in Recap shows this overexposure in greyscale, when a true intensity view would show the subject properly. I think Recap intensity view just converts the colorized planar view to the corresponding B/W view, just like your Instagram filter does, ignoring the underlying intensity return values.

Just my hunch...

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Re: FARO Laser-HDR still need some optimization

Post by Scott » Tue Jul 02, 2019 7:03 pm

sreed wrote:
Tue Jul 02, 2019 2:50 pm
I cannot contribute much to this interesting thread, but Recap has never handled intensity views properly from my experience. I don't think it has anything to do with the HDR or Scene's new intensity enhanced colorization. If we scan in color and an area of the scan is blown out and over-exposed, the intensity view in Recap shows this overexposure in greyscale, when a true intensity view would show the subject properly. I think Recap intensity view just converts the colorized planar view to the corresponding B/W view, just like your Instagram filter does, ignoring the underlying intensity return values.
Just my hunch...
:like: +1

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Re: FARO Laser-HDR still need some optimization

Post by lyoung » Tue Jul 02, 2019 10:18 pm

Hi Guys,
Thanks for the responses, the issue is not only in RECAP. Using the same PTX exports from Scene I can take them into Cyclone or Trimble Business Centre and have the exact same issue. See some snips from Cyclone below. The only difference between the two images and is whether HDR is applied in Scene or not and then PTX files exported.
Faro Laser HDR Photo Colouring Applied - Intensity In Cyclone.JPG
Faro Regular Photo Clouring Applied - Intensity In Cyclone.JPG
I have also compared the RF values in Scene as per your suggestion (I had not thought of that), and intriguingly they have returned the same RF1239 in the Raw scan, Photo Colouring Applied and HDR Photo Colouring applied.

My only thoughts now are that it is something happening on export from Scene to .ptx or Recap, Cyclone and TBC all have the same import bug.

Thanks for the assistance so far, will let you know if I find an answer.

Cheers,

Lachlan.
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Re: FARO Laser-HDR still need some optimization

Post by pomped » Wed Jul 03, 2019 7:58 am

Hi Lachlan,

I checked the SCENE PTX export and it directly uses the gray value and maps it to rang 0 to 1 (make sure to tick the "color and gray" checkbox in the export dialog). You can also easily check this by opening PTX within a text editor like Notepad++. PTX is an ASCII format so its size is large. If you can use another format you will save a lot of time and disk space. Have you thought about using fls?

For now it looks to me like a bug in RECAP.

Best regards,
Daniel

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Re: FARO Laser-HDR still need some optimization

Post by mca » Fri Jul 05, 2019 4:26 pm

I think the issue here is that the checkbox for color and grey was not enabled. In this case SCENE uses the color information to fill the grey values of the PTX file. If you enable the checkbox, the real grey values will be exported along the color and everything should be fine.
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Re: FARO Laser-HDR still need some optimization

Post by jedfrechette » Fri Jul 05, 2019 6:21 pm

This seems like rather unintuitive behavior. If the user has applied "Laser-HDR" I would expect that to be baked in to the RGB channels not intensity.
Jed

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