Problems importing images from Share S20: right camera split into two camera models – Generic vs. SHAREUAV model

[drones6]

Hi everyone,

I’m working on a project in PIX4Dmatic that combines drone images (DJI M4E) with images from a Share S20 laser scanner (which has a left and a right camera). Since Share S20 camera support was introduced in one of the recent Matic versions, I’ve been trying to process the scanner images alongside the drone data.

The issue: When importing the right camera images of the Share S20, Matic splits them into two separate camera groups:

1. SHAREUAV_SHARESLAMS20RightCam_SVCA01_3.6_3504x4672 – correctly identified as the Share S20 right camera (n=179 images)

2. Generic_ShareUAV_R2000_SVCA01_3.6_3504x4672 – assigned a generic camera model with completely different intrinsic parameters (n=1,237 images)

The left camera (SHAREUAV_SHARESLAMS20LeftCam_SVCA01_3.6_3504x4672, n=1,416) is imported cleanly as a single group without any splitting.

Camera internals comparison:

Looking at the intrinsic parameters of both models, the differences are substantial:

Parameter	Generic (R2000)	SHAREUAV (S20 from PIX4D DB)
Pixel size	2.4 µm	7.25 µm
Sensor width	8.41 mm	25.40 mm
Sensor height	11.21 mm	33.87 mm
Principal point x	1752 px	1746 px
Polynomial coefficients	0, 1, 0, 0, 0	0, 1, +0.022, −0.023, +0.061
Affine c / f	1752 / 1752	2322 / 2322
Source	user input	PIX4D database

The Generic model appears completely uncalibrated – zero polynomial distortion coefficients, wrong pixel size, no proper calibration entry. This will likely corrupt the reconstruction for the 1,237 affected images.

Please see the attached screenshots for reference.

My questions:

• Is this expected behavior, or is this a bug in camera model detection?

• Should I manually reassign all images to the correct Share S20 right camera model, or would that introduce errors?

• Has anyone successfully processed Share S20 data in PIX4Dmatic and run into the same issue?

Any help appreciated – thanks in advance.

Manuel

[drones6]

[Alvaro_Santiago]

Hi Manuel @drones6 ,

Did you process the project using the new version of SHARE PointClouds Editor? Could you please share two images to see the EXIF data?

S20 images

Thanks in advance

Regards

[drones6]

Hi @Alvaro_Santiago,

thanks for your fast reply. Yes, this was done with the v2.5. I uploaded some images for you. 4 images per camera group.

We captured with 0.5 s capturing interval, can this be the error source maybe? Also for this topic here ( Duplicate image warning rejecting valid images in Pix4Dmatic ), I somehow have the feeling this could also result from the 0.5s-intervall, too? if matic is reading the time form the EXIF and is only accepting seconds this could be a source of error? Can you please examine that and give some feedback? for both issues, the one here and the one in the link above?

[Alvaro_Santiago]

Hi @drones6

Thanks for sharing the images. I checked the EXIF data, and the camera is tagged as you can see in PIX4Dmatic. I would say that you need to contact them to find out why the images are tagged as ‘Share UAV R2000’.

Regards