Capture: Someone, Somewhere, In Summertime
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BenWilson, in reply to
Thanks a lot for that detail, Jarno. Does makes sense, although I'm still not entirely clear why averaging out a whole lot more shots doesn't add up to a long exposure in effect (which is what RegiStax would be doing). I wasn't talking about 8 frames in 8 seconds, I was thinking more along the lines of clearing the CMOS as rapidly as it can, building up an image with a shifted capture. Doing this, there should be no limit on exposure time at all, beyond that of the object of interest moving out of the field of view. I can see that for a wobbling image, the image processing to do on this would be huge. But a starfield is moving at an entirely predictable speed along a curve, so it's only having to translate and rotate in exactly the same way on every shot. You could build up a table of which pixel maps back to which for every consecutive shot, and the data is just poured back into the master shot, which would slowly gain detail. At short exposure, of course each individual shot will only contain a small amount of detail, lots of stars will not show up at all. But this will not be the case on every shot, intermittently a burst of photons from that star will get through, and add to the master picture.
I will check out RegiStax. It sounds like it could be fun to play with.
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Jos,
Cheers Lilith!
Looks good Ben, a wild plot! :)
We make sauces/chutneys and things like large pots of butter chicken sauce and freeze them in meal size containers.Plum sauce!
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Nora Leggs, in reply to
Plum sauce!
Resisting the urge to just say yum.
Monarch resting (briefly) on the top of the corn plant.
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Summer isn't usually a crisp green field.....
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Zins
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Chinese New Year is, at least in Beijing, and among many other things, Temple Fairs.
And Temple Fairs are, among many other things, masses of people idling past street food stands buying the snacks they like the look of - that would be Inner Mongolian lamb kebabs in the background, squid cooked on hot iron plates to its left, and some kind of tea concoction and other drinks to the right.
That's 龙潭庙会/Lóngtán Miàohuì/Dragon Pond (=name of a park in southern Dongcheng/former Chongwen District in the Beijing old city).
And lastly, I think that's the best crowd shot I got.
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Jarno van der Linden, in reply to
At short exposure, of course each individual shot will only contain a small amount of detail
Ah, but that is where it all goes wrong. A certain minimum amount of light has to fall on a CMOS cell in order to be registered at all, and brightness can only be detected and read back at discrete levels. Each level of brightness requires a certain amount of light.
So if the exposure time is too short, there isn't enough light at any of the pixels to produce any image. And if there is an image, there may not be enough levels of brightness to give anything more interesting than monochrome.
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I’m learning a lot on this thread.
Auckland waterfront tonight.
1. Landing.
2. Take off.The kids today…
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BenWilson, in reply to
A certain minimum amount of light has to fall on a CMOS cell in order to be registered at all
Sure, but we're talking about a moving image here anyway. If it's only one pixel wide, then it's not being exposed to the CMOS for very long as it is. Check out this shot. The smears formed by the planets are 37 pixels wide. That means it moved around about a pixel every 200 milliseconds (the exposure was 8 seconds long). Notice also that the shape of the pixels at both ends of Jupiter is quite sharp? I'd expect a greying in at each end if 200 millseconds wasn't long enough to capture the light coming from that object.
I guess the shorter question is "why does Registax work, then?". If it's not possible to build a clearer picture from a number of overlapping pictures of low exposure time, then that software shouldn't be able to work. So what I'm asking is why the camera can't just do the same thing, in real time, to save me having to muck around setting up a hundred photos.
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Feathered sky and hayful mellowness
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I want there to be a Pride Parade every year for ever. It was just a lovely day.
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And some more Pride Parade!
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JacksonP, in reply to
Well, it was such a great event, I decided to do a post.
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Ian Dalziel, in reply to
some more Pride Parade
Nice to see David Shearer, er, out...
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Jos,
A positive result in the tomato ripening experiment!
so far the one in the box in the shed is out performing the vine one. The taste test will be the ultimate decider of course. -
Nora Leggs, in reply to
A positive result in the tomato ripening experiment!
Nice one Jos, my tomato is only just flowering now!
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Is that Gareth Morgan down there?! I get him….
Nah, maybe that's not him....
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Cecelia, in reply to
Love the way cats communicate with their ears.
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Lilith __, in reply to
Classic, Nora! :-D
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Jos, in reply to
Nice cat studies Nora!
Six weeks from flowering to tomatoes apparently.
This is the faceless cat queen Hazel.
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Jos,
Here are all my orangy tomatoes in their boxes ready for their lids, I sorted them roughly from greens to ripest.
A bowl full of sweet 100's from this afternoon, they are so nice just popped on a bit of baking paper in the bbq while waiting for other stuff to do, the stalks are made for holding them.and a wasp dealing to a white butterfly caterpillar on a zucchini leaf
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Joe Wylie, in reply to
A bowl full of sweet 100's
Encountered them for the first time the other day, fancy that. They taste every bit as good as they look in your great pic.
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Islander, in reply to
Blackpoint Burmese?Myfamily have been proud partners with Burmese for over 4 decades -love em!
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Jos, in reply to
Cheers Joe! Here's the smell...
:)
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Nora Leggs, in reply to
Love the way cats communicate with their ears.
And their tails!
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