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Author Topic: (Hasselblad) multi-shot demonstration video  (Read 2002 times)
teddillard
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« on: August 27, 2010, 08:30:46 AM »
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I put this video together a long time ago- it started, in fact, as a Powerpoint demonstration back when I was with EP Levine, in Boston.  

Wait...  it actually started when I simply was trying to get my head around exactly how a multi-shot works, now that I'm thinking about it.  I used the Powerpoint to bypass having to figure out the math!   Roll Eyes 

Anyway, have a look...  if you're interested in the whys and wherefores of multishot capture, it may help out.  
http://www.parrotcolor.com/store/blog/?p=314

If you're really interested in understanding exactly how much better a multishot capture is than a single shot, even from the same sensor, I'd say there's simply nothing like a side-by side comparison to show it.  I may, pretty soon, be able to post that...  check for an update.
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Ted Dillard
Dick Roadnight
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« Reply #1 on: August 27, 2010, 09:29:15 AM »
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The video stops half way through.

Edit: I have tried it again and it works. (better download speed for some reason).

Does Bayer interpolation simply add the values of the four sencels that make up each genuine pixel?  I thought it was more clever than that, and gave you a greater pixel count than the actual number of genuine pixels?

The video implies that the dimensions of the sensitive area of each sencel is equal to the sensel pitch, which would, to some extent make nonsense of 16 shot.

How come the 16-shot illustration shows 9 squares not 16?
« Last Edit: August 27, 2010, 10:15:35 AM by Dick Roadnight » Logged

Hasselblad H4, Sinar P3 monorail view camera, Schneider Apo-digitar lenses
BobDavid
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« Reply #2 on: August 27, 2010, 09:30:18 AM »
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Excellent video. I'd seen it before. Maybe on Youtube?
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teddillard
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« Reply #3 on: August 27, 2010, 10:05:40 AM »
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Thanks Bob!  Yes- it's been on Youtube for while on my personal channel- Dick, not sure why it's stopping for you- maybe if you go to the YouTube page it will load for you.
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Ted Dillard
ondebanks
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« Reply #4 on: August 27, 2010, 11:01:14 AM »
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Very nice work. I'd never seen this explained before.

While the 4 shot is very intuitive, the way you've presented the 16-shot version makes me think that there must be matrix maths involved in disentangling overlapping colours. But perhaps they use a similar technique to astronomical "drizzle" software, which attributes all the flux in each "fat" native pixel to the centre of a smaller virtual pixel, and thus can eliminate the overlaps.
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teddillard
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« Reply #5 on: August 27, 2010, 12:43:57 PM »
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oh maaaaan.  you be talkin' da MATHS yo.  

 Cheesy

I honestly don't know how it's pieced together- I've asked, but I don't understand the answers...  Sad
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Ted Dillard
BrendanStewart
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« Reply #6 on: August 27, 2010, 02:52:13 PM »
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Ted, were you at the Focal Point yesterday in Quincy?
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teddillard
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« Reply #7 on: August 31, 2010, 11:00:10 AM »
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no, had to miss it...   Sad
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Ted Dillard
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