Merging multiple exposures for advanced denoising and ...

Helicon Filter: Want new feature? Suggest it here

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lutz
Posts: 155
Joined: 14.04.2006 02:51

Merging multiple exposures for advanced denoising and ...

Unread postby lutz » 03.10.2007 22:21

Merging multiple exposures for advanced denoising and de-blurring:

There still seems to be a lot of potential in the multiple exposure merging approach. Even more interesting because several new cameras can shoot bracketed exposures at such high speeds that the merging of handheld shots becomes easier. Might be intersting for "Filter" and "Focus".

Image de-blurring and denoising:
http://portal.acm.org/citation.cfm?doid=1275808.1276379

HDR-like denoising:
http://www.guillermoluijk.com/article/n ... dex_en.htm

handheld HDRs:
http://www.outbackphoto.com/CONTENT_200 ... index.html

lutz
Posts: 155
Joined: 14.04.2006 02:51

Unread postby lutz » 04.10.2007 20:14

Just found some more info.

A huge thread on the "zero noise" idea from Guillermo Luijk:
http://luminous-landscape.com/forum/ind ... 17775&st=0

and a somewhat similar kind of implementation:
http://www.stepok.net/eng/TurboPhoto/mshot.htm

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Dan Kozub
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Joined: 24.03.2004 18:14

Unread postby Dan Kozub » 08.10.2007 21:54

Lutz,

Thank for the info. We are now preparing 4.80 version which will have new slider and will work very similar to other tone mapping tools.

I personally like the results very much and I would be glad to hear your impressions!

lutz
Posts: 155
Joined: 14.04.2006 02:51

Unread postby lutz » 09.10.2007 04:23

hello Dan,
sounds great. Since Helicon has "some experience" with image stacking and merging we do expect good things.

mireille
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Location: Montreal, quebec, canada
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Unread postby mireille » 14.10.2007 01:55

Hello Dan,

I am hurry to see and try the new tool for tone mapping as I need it often!
:wink:
''Photographier c'est peindre avec la lumière''

lutz
Posts: 155
Joined: 14.04.2006 02:51

new slider?

Unread postby lutz » 25.10.2007 01:12

Hello Dan,

I just downloaded the new version today. The results from "merging for HDR" look very good and natural ( I did test with a single image so far). However, I cannot find the new slider you were writing about above. Is it implemented and I am just too blind?

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Dan Kozub
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Unread postby Dan Kozub » 25.10.2007 16:41

New slide Zone size is under Equalizer on the brightness tab. Should be there at least : )

lutz
Posts: 155
Joined: 14.04.2006 02:51

Unread postby lutz » 25.10.2007 21:58

Hello Dan,

I was looking in the wrong place for the new slider (in the merging process). I have played with the Zone size adjustments on a merged image and have found that the effects vary considerably depending very much on other settings in the brightness tab ( contrast, shadows etc.). E.g. with contrast set to 0 the zones produces a very nice subtle local contrast increase. If I increase general contrast, Zones seems to have the opposite effect and tends to flatten the image. I have not had much time to explore this. What would be your advice on the usage of the new tool?


Could it be that the Local Contrast tool got "bugged" inthe current release? It produces very strong and very non-local contrast increases for me.

lutz
Posts: 155
Joined: 14.04.2006 02:51

Nice !!!

Unread postby lutz » 27.10.2007 03:47

I just noticed how nice the "zone size" slider works together with normal highlight and shadows adjustments. Whereas brightening shadows or gamma usually leeds to a flat image look, this can be wonderfully compensated with adding "zone size" adjustments. On the pics I am currently working on it seems I am not going to use "contrast" anymore.


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