Re: atrophotography knowledge transfer: avi-to-single frame interpolation

Chris L Peterson wrote:

> On Fri, 04 Nov 2005 15:12:31 +1300, Jeremy Taylor
> >My specific application is not planetary imaging; I want to take regular/automated
> >images of a wall covered with a plan/chart. For legibility of the plan, the image
> >needs to be about 1024x768 pixels at least. I don't have a webcam with this
> >resolution, but I do have one that can do 640x480. Hence my enquiry as to whether
> >there may be any software around to process a captured avi of the display, to
> >achieve with a 640x480 sensor what cannot be done with a single frame capture.
>
> There is an image processing method called drizzling that will do this.
> A series of undersampled images are stacked, producing a new image with
> smaller pixels and therefore higher resolution. Unlike deconvolution or
> other estimation methods, drizzling produces a true, artifact free, high
> resolution image from a stack of low resolution images. In order to
> work, it depends upon the original stack being slightly misregistered.

> So you would need to move the camera a tiny bit between exposures.

Can this be random or does it need to be minutely controlled?


>
> There are software packages that support drizzle- Iris, Maxim, Registax,
> IRAF, maybe others.

Thanks for the pointer - and particularly for the term drizzling! That shall make my
search somewhat more focussed.

>
> In your case, however, wouldn't a simple mosaic be simpler? That is,
> just make four overlapping images and paste them together in Photoshop
> or a similar application?

Yes, though that would involve manipulation of the camera. I don't have a webcam that I
can do that with, though I suppose replacing with a PTZ movable security cam could be
an option. I'd like to set up the capture as a script/program so that human alignment
of the images is not necessary - wih a mosaic I run the risk of misalignments. It'll
depend on the accuracy of movement of the camera.

Thank you for your suggestions.

Regards
Jeremy Taylor

.

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