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Author Topic: Colorization of a TLS point cloud with TIFF 32bits float  (Read 597 times)

Vincent28

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Colorization of a TLS point cloud with TIFF 32bits float
« on: April 19, 2022, 11:31:30 AM »
Hello,

I work with thermal images via the multisystem approach. I would like to colorize a TLS point cloud with these to have a thermal aspect and a temperature value for each point.

I use RGB images (uint8) for the alignment (as master sensor), thermal images in color (uint8) and temperatures matrix (TIFF 32bits float) (both as slave sensors).
The differents sensors are calibrated and parameters of slave offsets are known and fixed.
Moreover, I georeferenced RGB images with GCP.
Then, I import the TLS point cloud with "import points" and I use "colorize dense cloud".

My problem is that I feel like only one image is used during the colorization process. You can see the colorization result on the attached screenshot.
In comparison, I try the same process with temperatures matrix as TIFF 16bits (pre-processed to find temperature later) and it works perfectly (all images are used).
So I would like to know if the problem of colorization comes from the 32bits float coding.

Thank and regards,
Vincent

Alexey Pasumansky

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Re: Colorization of a TLS point cloud with TIFF 32bits float
« Reply #1 on: April 19, 2022, 02:31:19 PM »
Hello Vincent,

Have you checked prior to the point cloud colorization process, that the imported points have properly oriented normals?
Best regards,
Alexey Pasumansky,
Agisoft LLC

Vincent28

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Re: Colorization of a TLS point cloud with TIFF 32bits float
« Reply #2 on: April 19, 2022, 03:46:39 PM »
With the same point cloud but 16bit tiff, the colorization works perfectly. You can see it on the following screenshot.
So I think the problem doesn't comes from the normals of points.

However, I recalculated and checked the normals of imported points. The colorization still doesn't work with 32bits float TIFF.


Alexey Pasumansky

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Re: Colorization of a TLS point cloud with TIFF 32bits float
« Reply #3 on: April 19, 2022, 04:33:52 PM »
Hello Vincent,

Ok, thank you! We will try to reproduce the issue with single channel 32 float images.
Best regards,
Alexey Pasumansky,
Agisoft LLC

Vincent28

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Re: Colorization of a TLS point cloud with TIFF 32bits float
« Reply #4 on: April 19, 2022, 04:55:38 PM »
Thank you.

Best regards,
Vincent


Vincent28

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Re: Colorization of a TLS point cloud with TIFF 32bits float
« Reply #5 on: May 16, 2022, 09:33:32 AM »
Hello,

I would like to know if there are some news or solutions about this problem.

Best regards,
Vincent

Vincent28

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Re: Colorization of a TLS point cloud with TIFF 32bits float
« Reply #6 on: June 15, 2022, 10:25:22 AM »
Hello,

I did some researches. I produced a point cloud using the same method from the photographs and the point cloud is correctly colored. However, colorizing a cloud acquired with TLS still does not work. Do you have a solution or a trail to propose to me?

Best regards,
Vincent