Recent Posts

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1
Lens Talk / Re: My first enlarging lens
« Last post by Zang on Today at 16:59:37 »
...it is badly scratched on the front, though.
2
Lens Talk / Re: My first enlarging lens
« Last post by Zang on Today at 16:58:58 »
It looks like a Schneider Componon 75/4.5.

Bingo!
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Lens Talk / Re: My first enlarging lens
« Last post by MEPER on Today at 16:22:00 »
It looks like a Schneider Componon 75/4.5.
4
Bruno, your problem sounds similar to what is done in metallography, when particles or phases have to be count in an alloy. That is done -when not manually- with Image analysis software. I only know some professional software, which is very expensive (IMAGIC). But I have googled and it seems, there is also free software available to do this. E.g. I found this: https://imagej.net/  Perhaps that is helpful to find something for your purpose.

Here is a further link right into the problem of counting: https://imagej.net/imaging/particle-analysis


And some other software, called ORBIT:  https://www.orbit.bio/tissue-quantification/
You must replace "Tissue" with "bats" ;-)  This software does not like jpg-pictures, they have to be transformed into some special format.   
5
I'm still busy with the processing of the data and images from the Microclimate n Bat Roosts project. Massimo's answer to my previous post is now in production to build presence maps, like the one below.

My next problem is to plot the number of bats through time. For that to happen, the first step is to substract from each picture a frame with no bat in it. As the camera is fixed and IR illumination is constant, I'm then left with blobs, representing the bats, which give an approximate count of individuals when  the colony is spread accross the roost. Not perfect but much better than counting them manually on 15.000 pics per roost, knowing next year's campaign will deliver over 100.000 images :)

Would you know a software that would do this in batch? Like substract a specific frame from an entire directory of pictures (JPG)?

Project background:
I'm involved in a multiyear bat conservation project trying to measure the influence of microclimate conditions in occupation of bats roosts. I'm in charge of the data acquisition, meaning temperature and humidity sensors and IR recording of the presence of bats.
Roughly speaking, I'm getting 600K datapoints and 100K images a year. Images are reviewed by volunteers and when bats are present, images are tagged and a pointer is added to the database of the sensor data at the right time and date. In a second stage, data scientists will look for correlations between whatever interior or exterior climate data and the presence of the bats. We are trying now to extend the amount of information by counting bats over time.





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Lens Talk / My first enlarging lens
« Last post by Zang on Today at 15:10:01 »
I have an enlarging lens laying around for years. It was dirty inside out. I just took it apart for cleaning and put on my camera using some plumbing stuffs :) It is fixed focus distance now but I might be thinking about giving it a helicoid.
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Your Weekly Blog / Re: December 2022
« Last post by Fons Baerken on Today at 12:32:32 »
December 2

chickadee

Z7 ii, 400mm f/5.6 ais, iso 6400

shot through a double window pane,

dxo photolab 6 deep prime noise reduction


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Lens Talk / Re: Thoughts on Nikkor 85mm f2 AI-S
« Last post by Snoogly on Today at 04:54:19 »
A recent comparison

https://youtu.be/fC_vQe3q0dE
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Lens Talk / Re: Thoughts on Nikkor 85mm f2 AI-S
« Last post by Zang on December 01, 2022, 21:24:41 »
I tried the Rokkor. It is OK but nothing stands out.
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Your Weekly Blog / Re: December 2022
« Last post by Fons Baerken on December 01, 2022, 13:15:05 »
December 1

tree

Iphone 2nd gen

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