On Thu, 24 Mar 2005 12:16:04 +0100, Felix E. Klee <felix.klee@inka.de> wrote:
How did OCR'ing go? I wonder because the resolution of cheap digital cameras is quite low for scanning. For example, to scan an A4 page (aspect ratio: sqrt(2)) with a usual digital camera (aspect ratio of images: 4:3) in 300DPI, you need a camera with more than nine mega-pixels.
Let's try something more realistic. Typical book size that I scan is under 8.5x11". Typical page is about 8.5x5.5"; typical text area is 6.5x4" to 7x4.5". So if focused solely on the text area, one would need about 2.2-2.8 megapixels / page, or for a full page impression, about 4.2. Most books do not lie flat enough to get two full page scans from straight up; you're better off doing each page at a time. So a 4 MP camera, with good optical zoom / focus, should be fine. This won't be cheap, but it's not in the same realm as a 9 MP camera. R C