Forum

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - jseinturier

Pages: [1]
1
Hi,

I know that i can do such a conversion using Agi Lens, but for material constraints i've no access to the software when i have to export the data, so i need to convert the camera calibration inside my own platform, that the reason why i ask you how to make the conversion by myself.

If i'm not able to do that, the Agisoft Photoscan software will be useless for us and we will have to look for other software...

2
Hello,

I'm a researcher that work on a photogrammetry platform developped for specific purpose (underwater exploration, ...) and i use for a time AgiSoft Photoscan for many time now.

The specific platform that i use has to deal with Agisoft Photoscan and has to be able to import / export data from / to your software.

My problem is that the camera model we use in our platform is the PhotoModeler model and i have to export it within Agisoft Photoscan model.

I know that the Agi Lens software can import a PhotoModeler camera and convert it to Photoscan Camera calibration. However, i have to make this conversion inside my platform and i can't use AgiLens at his time.

So here is my (pragmatic) question: How to pass from a photomodeler camera to a photoscan camera calibration ?

Here is one example:

Photomodeler parameters:
  • PMwp Image width, pixel: 1936
  • PMhp Image height, pixel: 1456
  • PMfocal Focal length, mm: 28.7486
  • PMfw Format width, mm: 36.1885
  • PMfh Format height, mm: 24.112
  • PMppx Principal point X, mm: 17.9828
  • PMppy Principal point Y, mm: 11.4851
  • PMK1 Radial distortion K1: 0.0001246
  • PMK2 Radial distortion K2: -1.909e-07
  • PMK3 Radial distortion K3: 1.172e-10
  • PMP1 Decentering distortion P1: -2.766e-06
  • PMP2 Decentering distortion P2: -1.535e-05

Agi Lens converted camera parameters:
  • PSwp Image Width: 1936
  • PShp Image height: 1456
  • PSfx Focal length (x): 1537.92
  • PSfy Focal length (y): 1735.91
  • PScx Principal point (x): 962.039
  • PScy Principal point (y): 693.533
  • PSskew Skew: 2.01075e-05
  • PSK1 Radial K1: -0.101602
  • PSK2 Radial K2: 0.147258
  • PSK3 Radial K3: -0.112404
  • PSP1 Tangential P1: 0.000401217
  • PSP2 Tangential P2: 7.19026e-05

I know at this time how to convert some data from photomodeler to photoscan:

Focal length
PSfx = PMfocal x PMwp / PMfw
PSfy = PMfocal x PMhp / PMfh

Principal point
PScx = PMppx x PMwp / PMfw
PScyPMppy x PMhp / PMfh

However, i wanted to know how to determine the skew (PSskew) parameter from photomodeler values and how to convert distortion.

Can you please help me ?

Thanks,

Julien

Pages: [1]