Archived posting to the Leica Users Group, 2001/04/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> Austin Franklin wrote: > > "Since you have to sample (scan) at > 'slightly more than' 2x the frequency you want to get, that would be ((1 x > (.5 x 5080)) x (1.5 x (.5 x 5080))) or ~9M pixels." > > This is incorrect, you don't seem to understand when it's appropriate to > invoke the Nyquist criterion. The correct pixel count is four times your > figure. > > David Morton > dmorton@journalist.co.uk Sorry, but my statement is perfectly correct. Having 25 years of digital signal processing and both digital imaging and digital audio design and development experience, I believe I understand this topic quite well. Digital imaging IS sampling, and as such, basic sampling theory does apply. If you want to understand why, I can try to explain it to you, or you can try to find some web sites that explain this basic principle.