Subject: Re: [stella] Some Questions That Bug Me From: "John Saeger" <john@xxxxxxxxxxx> Date: Sun, 24 Jun 2001 01:11:12 -0700 |
Chad Schell wrote: > Wouldn't that depend a lot on the optics / electronics of the video > cameras? If the cameras output a resolution higher than you capture than > you're losing information. O.K. the cameras put out what I would consider to be a *regular* video signal. The picture shows up on any typical monochrome video monitor. Nothing special. I haven't measured it but they tell me that the information comes at 30 fps. And I'm capturing with one of those ASUS all-in-one deluxe video cards. Also at 30 fps. How many scanlines of *real* information is that? Is it more like 240 or 480? And what does Glenn mean by interlaced? Does a video signal repeat the same information twice so that the screen is updated at 60 fps? Or is it new information each time? But updating every other scanline? > It also depends on what you're looking at with the microscope. Is it small > enough that the loss of resolution would make any difference in what you > ultimately want to do with the images? I don't know for sure. Probably not, but I'd hate to lose anything important. ;-) They tell me that the images are limited more by the optics than the camera. It's Brewster angle microscopy and the resolution is supposedly pretty low. John > > Chad > > At 11:39 PM 6/23/2001, you wrote: > >Glenn Saunders wrote: > > > > > I would say that the maximum usable number of scanlines is 482, i.e. 241 > > > noninterlaced, again, with much of the picture going into overscan. > > > >Sorry for asking an off-topic question, but I'm hooking up video capture to > >some microscopes that have video cameras on them, and I'm wondering what > >resolution to capture at. I can capture at 30 fps, but should I use 352x240 > >or 704x480? Am I losing any real information if I use the lower resolution? > > > >John > > > > > > > >- > >Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > >Unsub & more at http://www.biglist.com/lists/stella/ > > > - > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > Unsub & more at http://www.biglist.com/lists/stella/ > - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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