Path: utzoo!attcan!uunet!mcsun!ukc!slxsys!bae-st!adam From: adam@ste.dyn.bae.co.uk (Adam Curtin) Newsgroups: comp.graphics Subject: Cleaning up frame-grabbed images: "Fourier plane"? Message-ID: <1990Sep27.085647.13944@ste.dyn.bae.co.uk> Date: 27 Sep 90 08:56:47 GMT Reply-To: adam@ste.dyn.bae.co.uk (Adam Curtin) Organization: British Aerospace (Dynamics), Stevenage Lines: 25 Hi I'm considering buying a colour digitiser (video frame grabber) as a cheap substitute for a colour scanner. However, all of the images I've seen have black lines across them, something to do with the video signal and scanning and such, which spoil the image. My wife remembers from her physics undergraduate days that an image overlayed with a grating could be optically processed to remove the grating - light from the image was focused though a lens to come to a point at the fourier plane. Then, somehow, the image the other side was a magically cleaned up version of the original. (You can tell that I don't understand it very well :-). She can't describe it well enough for me to code it (even if I could understand it), but she tells me that the technique is often used for cleaning up images from satellites. Can anyone illuminate me? Adam -- A. D. Curtin . Tel : +44 438 753430 British Aerospace (Dynamics) Ltd. . Email: adam@ste.dyn.bae.co.uk PB 230, PO Box 19, Six Hills Way, . Stevenage, SG1 2DA, UK. . "My other car is an FJ1200"