Messages

1

General / Re: PIxel Size in Camera Calibration

« on: October 24, 2017, 12:25:50 PM »

Hi Alexey

I am trying to calculate the pixel size  based on the crop factor using this formula:
pixel_width = 43.27 * EXIF FocalLength  / EXIF FocalLengthIn35mmFilm  x 4/5 x Image Width

But  there is some significant differences between my calculation and PhotoScan calculation (with FC6520 Sensor). I don't understand why. Could you help me ?

Many Thanks

2

General / PIxel Size in Camera Calibration

« on: July 24, 2017, 07:25:16 PM »

Hello All

I want to calculate the pixel Size of my Sensor in order to create my chunk.zip file. How is this value calculated in Photoscan from the image ?
I can not find this data in the Exif. I canno't find neither the FocalPlaneXResolution & FocalPlaneYResolution in the Exif.

Any help would be very helpful !

Many thanks

3

General / Re: Performance 1.2.5 vs 1.3.0 and gpu usage

« on: March 17, 2017, 08:02:33 PM »

Hello jij,

Yes, I mean that after release of the version 1.3.0 build 3772 some optimizations were implemented.

Hello Alexey,

After installing your beta version, we rerun our tests with jiji .

We still observed that, only 10 - 15% of gpu is used on p2.8xlarge (8 gpus) and only 30 - 40 % gpu is used on g2.8xlarge (4 gpus). So it doesn't fix our issue.