Problem with recovery of response curve by pfshdrcalibrate

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Dominika Knera

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Jan 14, 2018, 10:07:13 AM1/14/18

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Hi,

I am new to Ubuntu and pfstools. I've followed the procedure mentioned in README_Ubuntu to install pfstools (version 2.1.0) in my Ubuntu 17.10. During installation I had some problems with OpenCV with the "nonfree" modules, but I managed it. After that, installation of pfstools went smooth.

I started working with pfstools acording to:

http://resources.mpi-inf.mpg.de/hdr/calibration/pfs.html

I used the images from exemplar (exposures.tgz) and I tried to recover the response curve as it was described in mentioned tutorial. I had put command in terminal:

pfsinhdrgen sample.hdrgen | pfshdrcalibrate -v -s camera.response

firstly it started working well, but after few seconds in terminal appeared:

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File with response function occured, however it not look like response function in tutorial, moreover the weight function was nonsymmetric and in some part higher than 1.

I tried to add "-r linear" in pfshdrcalibrate, however it still not working well.

Below I add hdrgen file and response functions I got using default (first graph) and linear settings (second graph).

Could you help me and suggest what I doing wrong?

Thanks in advance !!

Dominika

hdrgen file:

/home/dominika/exposures/img01.jpg 0.0769231 2.8 100 0

/home/dominika/exposures/img02.jpg 0.1 2.8 100 0

/home/dominika/exposures/img03.jpg 0.25 2.8 100 0

/home/dominika/exposures/img04.jpg 0.3125 2.8 100 0

/home/dominika/exposures/img05.jpg 1 2.8 100 0

/home/dominika/exposures/img06.jpg 1.25 2.8 100 0

/home/dominika/exposures/img07.jpg 3.33333 2.8 100 0

/home/dominika/exposures/img08.jpg 4 2.8 100 0

/home/dominika/exposures/img09.jpg 60 2.8 100 0

/home/dominika/exposures/img10.jpg 80 2.8 100 0

/home/dominika/exposures/img11.jpg 320 2.8 100 0

/home/dominika/exposures/img12.jpg 400 2.8 100 0

/home/dominika/exposures/img13.jpg 1000 2.8 100 0

graphs.pdf

Rafal

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Jan 14, 2018, 10:22:19 AM1/14/18

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Dominika,

pfshdrcalibrate has changed quite a bit since the tutorial was written. I would recommend that you check the manual page for pfshdrcalibrate.

pfshdrcalibrate will always produce an image and pass it to stdout, so you want to add to the command " | pfsview" or the redirection " >/dev/null"

The weighting function has changed. Since the code is available, you can replace the weighting function with whatever you need.