05-13-2019 08:30 AM - edited 05-15-2019 07:33 AM
Digital Medium format cameras have an issue with distortion and possibly diffusion as well as the short focal length creates poor geometry. They can be used, but emphasis should be placed on platform calibration and little faith on vendor claims. If large scale accuracy is desired one must fly lower than the film equivalent and possibly perform a grid calibration over a high accuracy test block to apply the grid correction to measured points. Please provide the specific camera model and vendor software for platform calibration you are interested in pursuing.
05-14-2019 05:31 AM
The UAV Import command in ISPM does recognize the iXU-1000R and the iXU-RS1900 cameras. I was able to download three small samples from Phase One's web site. The iXU-RS1900 photos imported without any problem, but the two iXU-1000R samples errored off. The camera was recognized properly but I suspect there might be some EXIF tags that could be throwing us off. I am adding a story to our backlog to investigate the failure for these samples.
05-18-2019 04:22 PM
We have several customers who have setup Phase-one IXU-RS-1000 using Imagestation. They are just entering the Project information manually. As Dan mentioned above the danger is entering the Lens Distortion information with Coefficients. Beware the Equation and the Order of the coefficients, the equation may not be exactly the same as that used by Imagestation.
A recent calibration certificate we got included 3 lots of coefficients for slightly different polynomial lens distortion equations, although names K1 to K5 are same. Incorrect input can give very bad distortions not initially seen.
The best to be certain , is to use Radial Correction Lookup Table (distances and corrections) and let Imagestation compute the coefficients.
10-29-2019 02:12 PM
I have a project with camera PhaseONE iXM150F_50_mm). I am having hard time to setup correct stereo models after the adjustment with this camera. I would appreciate your help initially how do you setup the camera file based on the calibration report that the flight company provided.
Please find the calibration report attached.
10-29-2019 03:36 PM - edited 10-29-2019 03:48 PM
I simply feed the Australis K1 K2 and K3 coefficients into the dr equation provided to get a distortion list.
I use a spatial model to do this.It's always worked in past.
However, unless i have made a mistake, or the vaules in certificate are incorrect, this is the WORST camera i have ever seen. I would NEVER use it for any accurate Photogrammetric work. For example the Lens distortion at distance 24mm is 176.16um (46.8 pixels)
I only added dr 0f up tp 24 mm in camera file to show you input, for this lens you would go to 34mm. And thats worse 410.71um 109.2 pixels
Here's my data, Good Luck
11-04-2019 01:16 PM
From the calibration report the Sensor Resolution shows 14024 x 10652 (instead it is of 14204 x 10652 from the flight company).
How much effect will have this in your lens_distortion table. Or not at all as I see it from your Spatial Model Editor?