It is currently Wed Aug 20, 2014 8:39 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject: CCR & Black Ref
PostPosted: Fri May 22, 2009 11:21 am 
Offline

Joined: Wed Jan 21, 2009 3:19 pm
Posts: 23
So I am new to the phantom cameras and I was just wondering if it mattered if when you did you CCR and your BR, I mean in what order should I do them? or does it not matter?


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Fri May 22, 2009 4:29 pm 
Offline
VRI Employee
VRI Employee

Joined: Thu Feb 22, 2007 4:07 pm
Posts: 190
A current session reference, CSR is done whenever you change a parameter, i.e. resolution, exposure, EDR, etc. It's also recommended that you perform a CSR just prior to shooting your images even if the parameters have not changed in a while. The black reference is done at when the camera is set at full resolution.

Mike


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Fri May 22, 2009 5:33 pm 
Offline

Joined: Wed Jan 21, 2009 3:19 pm
Posts: 23
So you only need to do it at full rez? How often do you do them then?


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Sun May 24, 2009 9:39 am 
Offline

Joined: Thu Aug 30, 2007 6:57 am
Posts: 106
Location: Romania
This procedure below, as we do it based on advice from the VR designers here in Bucharest, is for calibrating camera using the laptop software (not the Phantom on-board buttons):

1. switch the camera on and let it get to a stable temperature under the shooting lighting conditions (recommended close to 40C);

2. when temperature stable, set the parameters for full sensor resolution, max frame rate for that rez, 180 degrees shutter / exposure (half of max value if microsec), default values in image processing (brightness 0, contrast 1, gamma 1, saturation 0; white balance values as Red 1 and Blue 1);

3. insure your pvp is not opened;

4. click on Option button and perform a Black Reference for this settings, following the dialog steps (cover the lens) and save it into the camera non-volatile memory when you are asked;

This step will insure you all the pixels will have the same values at the beginning of your shooting session;
If BR was correctly performed, your histogram will show you just one vertical line on the left side of its window.

5. remove the lens cap;

6. do the correct white balance for your lighting conditions; insure you right click for white on an image area where the pixels are not over saturated on all the RGB channels;

7. set the session parameters as you will need: resolution, frame rate, exposure

8. perform a CSR for that shooting session, following the dialog steps;

If CSR was correctly performed, the histogram will show you one single vertical line on the very left of its window;

If as result of BR or CSR you'll have more than one black vertical line on the left of the histogram window, the lens cap was not perfect covered the lens during the procedure.

We're performing BR only at the beginning of the shooting day and we perform CSR each time when we change resolution.

New CSR when frame rate or exposure is changing is usually not need it if camera didn't change the temperature.
To prevent the artifacts appearance during the shooting, without having to pause all the crew for a new CSR, we are checking image quality from time to time, pushing/forcing the gamma and the saturation in image processing; check if all the frame modifying the look in the same way (without any vertical lines standing out) and then bring the values back to default. If any vertical columns get visible when pushing colors, you will need to do a new CSR.

This procedure helped us to keep the camera very stable, and obtain lovely image results without having to perform CSR when is not really need it, interfering with the shooting day.

Hope that helps. If anyone has any other suggestions or input, we will love to hear.

_________________
"Time is money!"


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Tue May 26, 2009 7:49 am 
Offline

Joined: Wed Jan 21, 2009 3:19 pm
Posts: 23
Wow, thanks a lot that should really help!


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Tue May 26, 2009 10:30 am 
Offline
VRI Employee
VRI Employee

Joined: Thu Feb 22, 2007 4:07 pm
Posts: 190
There is no particular order to do them however the CSR is usually done more frequently because the calibration of the sensor is done at the current ambient conditions and camera settings. The BR is more of a general calibaration but the CSR is a custom calibration. The only crucial item is that the BR is done at full resolution.

Mike


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Mon Jul 18, 2011 2:08 pm 
Offline

Joined: Wed Dec 06, 2006 10:39 pm
Posts: 22
Just re-read this old post and was curious about the requirement to shut down the PVP (Step #3). Does the PVP interfere with BR calibration? Does it affect CSR calibration, too?

drk


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Mon Jul 18, 2011 2:15 pm 
Offline

Joined: Thu Aug 30, 2007 6:57 am
Posts: 106
Location: Romania
Sorry..

Its an old post... Things are more simple now.

Should be used as a basic guideline..

Tony

_________________
"Time is money!"


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Mon Jul 18, 2011 2:35 pm 
Offline

Joined: Wed Dec 06, 2006 10:39 pm
Posts: 22
Tony,
Yes but my camera is old, too. We have a v7.1 and are therefore stuck with the old legacy software (Ph663). :( We make heavy use of the PVP, because its playback features (similar to those of the PCC software) are superior to those available in the legacy software. So we usually keep the PVP open alongside the Ph663 software, and perform CSR calibrations throughout the day. Do we need to close the PVP when performing CSR?

Thanks,

drk


Top
 Profile  
 
 Post subject: Re: CCR & Black Ref
PostPosted: Mon Jul 18, 2011 3:21 pm 
Offline

Joined: Thu Aug 30, 2007 6:57 am
Posts: 106
Location: Romania
We might have a copy of 669 which is less "buggy" if you want it..?

Tony

_________________
"Time is money!"


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group