Re: photometry on video using AstroImageJ
Posted by
karenacollins on
Apr 14, 2021; 6:53am
URL: http://astroimagej.170.s1.nabble.com/photometry-on-video-using-AstroImageJ-tp1548p1549.html
Hi Alnair,
I didn't have any problem running photometry on your AVI file (see
below) using AIJ 3.4.0.25 running under Windows 10 and Java 64 bit.
See the image and light curve below.
One issue is that the AVI file format does not provide fits headers
(of course). The fits headers contain timing information that AIJ
uses to extract timing to display on the light curve plot. I believe
in older AIJ versions, AIJ would hang if no timing information was
found. Ensure that you have updated AIJ to the latest daily build
following these instructions:
http://astroimagej.1065399.n5.nabble.com/After-a-fresh-installation-of-AIJ-be-sure-to-update-to-the-latest-build-td142.html
If that doesn't solve the problem, click the lower portion of the
AIJ Toolbar and report the information displayed in the lower part
of the Toolbar. Also report the OS you are running. Also include a
screen grab of the Multi-plot set-up panel before you click "Place
Apertures".
Karen
On 4/13/2021 2:07 PM, Alnair [via
AstroImageJ] wrote:
Hi,
From some types of astronomical events (i.e. star
occultations by minor planets) fast photometry was
required in order to get useful results, so many astronomers
registered the phenomenon with high sensitivity video
cameras with precise time leveling taken from a GPS device.
Here is a sample still image of a such videos:
AstroImageJ seems to understand the video format (AVI
uncompressed) it shows all the frames (just
letf-right mirrored).
However, multi aperture photometry doesn't work. After
setting up the apertures it doesn't start processing the
images.
This is how AstroImageJ looks after pressing
<Enter> to start processing:
It would be nice if it works, since AstroImageJ is better
on photometry (in my opinion) than other alternatives other
astronomers use.
Here is a sample uncompressed video (warning, 346 Mb)
Maybe it's easy to solve. It seems it nearly works.
Thanks,
Ferran Casarramona