Search found 24 matches

by Hibou
Tue Jul 24, 2018 3:21 am
Forum: Tutorials
Topic: Understanding Binning
Replies: 19
Views: 5253

Re: Understanding Binning

Brian, Yes the deep well is good; it is largely due to the large pixel size, which is also good for collecting more light. For a real-life comparison of low-light CMOS cameras see https://www.1stvision.com/machine-vision-solutions/2018/03/machine-vision-industrial-camera.html I asked FLIR about the ...
by Hibou
Mon Jul 23, 2018 5:02 am
Forum: Tutorials
Topic: Understanding Binning
Replies: 19
Views: 5253

Re: Understanding Binning

Thanks Brian. I will try to measure the dark current in my IMX249 FLIR camera using Robin's method. It doesn't have cooling and runs at 45C with passive heat sink and fins (58C unmounted). I asked FLIR why they didn't publish dark current and was told that they were working on EMVA compliance. But I...
by Hibou
Sun Jul 22, 2018 12:53 pm
Forum: Point Grey Cameras
Topic: CMOS binning and IMX249 vs ICX829 comparison for low-light imaging
Replies: 4
Views: 856

Re: CMOS binning and IMX249 vs ICX829 comparison for low-light imaging

Thanks for confirming that. For me, binning is what you do to trade resolution for intensity. I guess that's why some CMOS cameras emulate CCD binning in firmware/software. But you might do better by first filtering hot pixels prior to CMOS software binning. Actually, there is not a huge difference ...
by Hibou
Sun Jul 22, 2018 4:38 am
Forum: Tutorials
Topic: Understanding Binning
Replies: 19
Views: 5253

Re: Understanding Binning

Yes, this is an excellent account of noise and binning for exposures of 0.1s. I would like to be able to repeat the comparison between CCD and CMOS for slightly longer exposures, say 1s. Unfortunately I can't find numbers for CMOS dark current on either the Sony or FLIR websites, despite dark curren...
by Hibou
Sat Jul 21, 2018 6:54 pm
Forum: Point Grey Cameras
Topic: CMOS binning and IMX249 vs ICX829 comparison for low-light imaging
Replies: 4
Views: 856

Re: CMOS binning and IMX249 vs ICX829 comparison for low-light imaging

I guess some CMOS cameras like ZWO may have software binning built in, but hardware (on-chip) binning before readout is a unique advantage for monochrome CCD technology. Atik have a nice explanation https://www.atik-cameras.com/news/binnning-the-differences-between-cmos-and-ccd/ and Robin gives more...
by Hibou
Sat Jul 21, 2018 8:32 am
Forum: SharpCap Beta Testing Forum
Topic: SharpCap 3.2 Beta now available
Replies: 39
Views: 4687

Re: SharpCap 3.2 Beta now available

Yes, the Google site: filter can always be used to restrict searches to a particular page/site. And Dave may not approve, but I have a suggestion for another feature viewtopic.php?f=27&t=1008 :-)
by Hibou
Sat Jul 21, 2018 8:27 am
Forum: Point Grey Cameras
Topic: CMOS binning and IMX249 vs ICX829 comparison for low-light imaging
Replies: 4
Views: 856

CMOS binning and IMX249 vs ICX829 comparison for low-light imaging

On-chip binning is unavailable for CMOS chips, and because pixels are often small for high resolution, intensity can be insufficient (and resolution excessive) for low light imaging. Off-chip binning can then be useful to improve signal/noise. Isolated hot pixels should first be removed using eg Pro...
by Hibou
Fri Jul 20, 2018 8:50 am
Forum: SharpCap Beta Testing Forum
Topic: SharpCap 3.2 Beta now available
Replies: 39
Views: 4687

Re: SharpCap 3.2 Beta now available

Yes Dave, I did mean it as a complement, but as a "foreigner" couldn't resist playing with the English language :-) It is certainly a comprehensive reference, and helps Robin answer our naive questions. The only thing missing perhaps is a search box to go with "Topics" and "Contents". You might adap...
by Hibou
Thu Jul 19, 2018 4:54 pm
Forum: SharpCap Beta Testing Forum
Topic: SharpCap 3.2 Beta now available
Replies: 39
Views: 4687

Re: SharpCap 3.2 Beta now available

Dave, I agree in general with your distaste for bloatware. I also agree that imageJ does a great job with its noise filters. My only point was that stacking to a summed 32-bit TIFF file is a nice feature of SharpCap, and that it might be an advantage to filter noise before summing short exposures wi...
by Hibou
Thu Jul 19, 2018 7:10 am
Forum: SharpCap Beta Testing Forum
Topic: SharpCap 3.2 Beta now available
Replies: 39
Views: 4687

Re: SharpCap 3.2 Beta now available

Thanks Robin. I missed that. Two other minor quibbles :-) 1) Is there some way I can avoid "Align Frames" being turned on automatically if I open "Stacking" after re-launching SharpCap? "Align Frames" does remain off if I close and re-open "Stacking", but not after I exit SharpCap. I understand that...