My reply was to the 'garbage in garbage out' remark - nothing else. Sorry if I've drifted away from the topic.
Don Williams ___________ Dr E D F Williams http://personal.inet.fi/cool/don.williams Author's Web Site and Photo Gallery Updated: March 30, 2002 ----- Original Message ----- From: "Rob Studdert" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, January 09, 2003 12:43 AM Subject: Re: Pentax DSLR: e-mail from Pentax USA > On 8 Jan 2003 at 17:24, Dr E D F Williams wrote: > > > It does not matter how noisy a signal is, if the information is there it can be > > retrieved. In Electron Microscopy the images are often terribly noisy. For > > ordered structures Fourier transforms, rotational symmetry, or a combination of > > methods is useful. I have programs to do things like that and if I can find a > > decent electron micrograph of a virus I'll try to prepare some images that > > illustrate the cleaning of an image. Image processing can be done in real time > > on an optical bench, but its more difficult. > > Ah, yes but this type of processing is designed to to enhance visibility, > however it doesn't necessarily preserve fidelity. Your example would be similar > to applying a broad band audio signal to a narrow band pass filter in order > that a voice signal be rendered more audible with a loss of all out of band > information. This is not what we are talking about WRT high performance optical > sensor performance limitations and post processing. > > Rob Studdert > HURSTVILLE AUSTRALIA > Tel +61-2-9554-4110 > UTC(GMT) +10 Hours > [EMAIL PROTECTED] > http://members.ozemail.com.au/~distudio/publications.html >
