Riegl Reflectance Export

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mozendi
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Riegl Reflectance Export

Post by mozendi »

Dear Riegl Users,

I am a PhD student and I developed a model for Faro Focus 3D X330. I need to validate this model with other scanners. For this reason, I hired a company to get Riegl VZ400 scan data. However, the company claims that reflectance values can not be exported only intensity can be exported. I am using Faro Scene and Trimble Real Works software for point cloud processing and Matlab for some programming. Can you please inform me if reflectance values can be exported using Riscan Pro? If it is possible to export reflectance values can you please explain me how to do it step by step. So that, I will share this information with the company and hopefully I can get reflectance. Otherwise do you know how to convert intensity values to reflectance for Riegl VZ 400?
I am looking forward to hearing from you,

Sincerely

Mustafa
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joe.3dlm
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Re: Riegl Reflectance Export

Post by joe.3dlm »

Hi Mustafa,

The confusion I think is happening because Riegl scanners and software have two different "intensity" attributes - "amplitude" and "reflectance".

Amplitude is what everyone in the industry calls "intensity" - that is, the raw amplitude of the return pulse. This falls off with range, so the same target will have different amplitudes at different ranges.

Reflectance is amplitude corrected for range - i.e. the effect of amplitude reducing with range is corrected, so the target will have the same reflectance at different ranges.

Scene and RealWorks probably can't handle two different "intensity" attributes, so when your supplier exports the scan data they will have to decide which attibute (amplitude or reflectance) they send to the "intensity" attribute of the export file.

This is as simple as picking from a drop-down when exporting:
export intensity.jpg
Normally I'd recommend "reflectance as intensity", scaled between -25 and +5:
ref_range.jpg
This will change the scale to suit whatever the export format can handle (e.g. 0-255 or 0-1 for example)

Changing the scale will effect the contrast in the intensity values. If you have lots of highly reflective surfaces, try -15 to +10.

Cheers,
Joe
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mozendi
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Re: Riegl Reflectance Export

Post by mozendi »

Dear Joe,

Thank you for explanation. By the way, which version of Riscan did you use for images in the post and is it possible to get trial version of the software ?

Best Regards,

Mustafa
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Re: Riegl Reflectance Export

Post by joe.3dlm »

Hi Mustafa

I used v2.3. You'd need to speak to your local distributor about getting a trial:

SEZA LTD. STI.
Kuleli Sokak 81/11
06700 G.O.P Ankara, TURKEY
Tel.: +90 (312) 4462656
Fax: +90 (312) 4462658
E-mail: [email protected]
Web: www.seza.com.tr

Cheers,
Joe
mozendi
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Re: Riegl Reflectance Export

Post by mozendi »

Hi Joe,

Thank you for helps. Now I can work on reflectance of Riegl data.
Best Regards
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