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distances measured by Zerene

 
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Adalbert



Joined: 30 Nov 2015
Posts: 732

PostPosted: Sat Feb 02, 2019 6:09 am    Post subject: distances measured by Zerene Reply with quote

Hello everybody,
I have already used Zerene for the testing of the step-size of the rail and done it as follows:


But I have forgotten how to set the following properties:
-Preferences->Alignment->Scale ?
-Preferences->Alignment->Align each frame against first frame separately ?



Does anybody know the expected values/settings?
BR, ADi
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 20079
Location: Richland, Washington State, USA

PostPosted: Sat Feb 02, 2019 10:38 am    Post subject: Reply with quote

Scale should be turned off. The setting will not matter if your setup is well aligned, so that focus does not vary from one frame to another. But if focus does vary slightly, then you may get marginally more accurate results by turning scale off.

If you're mainly interested in movement between adjacent frames, then "Align each frame against first frame separately" should also be turned off. If you want to measure movement between more widely separated frames, then you may get more accurate results by turning the option on. This option is intended for high accuracy measurement applications where nothing changes except lateral movement. It avoids the possibility that minor errors in frame-to-frame measurement might accumulate to form a significant error after many frames.

--Rik
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Adalbert



Joined: 30 Nov 2015
Posts: 732

PostPosted: Thu Feb 14, 2019 1:55 pm    Post subject: Reply with quote

Hello Rik,
During my test of the rail with 16 micro-steps the “Align each frame against first frame separately" was turned off. Would I get any advantage I if set it to ON for such kind of the test?
http://www.photomacrography.net/forum/viewtopic.php?t=38957&postdays=0&postorder=asc&start=0
BR, ADi
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 20079
Location: Richland, Washington State, USA

PostPosted: Thu Feb 14, 2019 4:01 pm    Post subject: Reply with quote

Adalbert wrote:
During my test of the rail with 16 micro-steps the “Align each frame against first frame separately" was turned off. Would I get any advantage I if set it to ON for such kind of the test?

Since you are concerned mainly with individual step length, I recommend to keep that option turned off.

I would recommend to turn it on if say you want to measure the offset between frames 0 and 100 as a single distance. In that case you're better off comparing those two frames directly against each other, as opposed to having Zerene Stacker compute the total distance as distance(0:1) + distance(1:2) + distance(2:3) + ..., that is, adding up 100 small distances in order to compute an approximation to the total distance.

--Rik
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