Many people confuse DPI with PPI.
Even though the terms "dots per inch" (DPI) and "pixels per
inch" (PPI) are used interchangeably by many, they are not
the same thing. In many instances the term DPI is used when
in fact PPI is what is really meant.
To measure the accuracy of OCR
when a thick-spine book is scanned with a flatbed scanner
versus V-shaped bookscanner and to show how the image quality
and the scanning method is related to this.
An overview on methods to scan
a book using three different kinds of book scanners. It compares
and discusses the various advantages and disadvantages of
using those methods.
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