Old 04-09-2020, 04:33 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 8,118
CMOS software binning?

With the CMOS cameras any binning must be done after the image acquisition in a suitable software package.
The only software, so far, I've found is PIPP.
This offers 2x2, 3x3, 4x4 binning
You can run a SER video (taken with Firecapture) through PIPP with say 3x3 binning and get an output file (SER).
This can then be processed through AS3! etc but with the larger plate scale.

I have a SER video taken with the ASI 1600 which gives a plate scale of 0.79 arcsec/pixel. The image size is 4640 x 3496 (as a TIF, 93 Mb)
Run through PIPP then AS3! the size is 1192 x 1192 (as a TIF, 8.1 Mb), plate scale 2.4 arcsec/pixel.

I also use Irfanview viewer, and can reduce the size of an image....
If I reduce the original image (4640 x 3496) to (1582 x 1192) the TIF is only 725 Kb. It seems to use the Lanczos "compression"

So, the question is - What's the difference between the PIPP binning and the Irfanview re-sizing?????
Reply With Quote
Old 05-09-2020, 10:53 AM
Camelopardalis's Avatar
Camelopardalis (Dunk)
Drifting from the pole

Camelopardalis is offline
Join Date: Feb 2013
Location: Brisbane
Posts: 5,110
Have you tried both methods to compare, Ken?

My preference would be to process at the native resolution and resample as a final step. The logic is that any "extra" noise precipitated from potentially finer enhancement is somewhat tempered by the subsequent sampling (through loss of resolution!)
Reply With Quote
Old 05-09-2020, 12:01 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 8,118
Yes, tried it yesterday.....
The original SER (Firecapture) file was "so-so", but IMHO the results from the PIPP binning seemed much better, better definition.....

I'm about to re-do the comparison with what I think is a "good" initial SER.
Stay tuned.
The attached composite image (saved as a jpeg) has the irfanview "reduced" image at the left, the PIPP image in the middle, and the "original" full sized Firecapture image on the right.
Attached Thumbnails
Click for full-size image (comparison.JPG)
134.7 KB6 views
Reply With Quote


Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +10. The time is now 01:11 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
NexDome Observatories
Limpet Controller
Astronomy and Electronics Centre