Operation Manual Page 59
B.3 Laser guided Document Type Detection
This chapter is important to understand because it describes the most common scanning
problems and their cure.
The Bookeye® 3 scanner has an auto focus system that actually stays in focus as the
scanner sweeps from left to right over the scanning area. To achieve this, the pre scan
must be able to capture the heights profile of the document. This is pretty simple while
scanning a flat surface but becomes challenging if scanning a thick book.
The height profile is also necessary to move the light beams across the scanning area.
The two lamps and the line CCD form an electronic gear. Details are described in the
Setup and Assembly Manual.
The gear is adjusted at the home position (lowest position) during the setup process. If the
height of the document is known at a given position, the lamps can compensate for with a
change in the angle relative to the scanning position and therefore guarantee the best
possible illumination.
The scanner also has a built in digital zoom. As the document gets closer to the scanning
head the digital zoom is adjusted accordingly to keep the resolution and document size
independent of its heights.
B.3.1.1 Description of the Laser Purposes
The Bookeye® 3 scanner comes with a built-in line laser that serves five different
purposes.
— During the setup procedure, the laser line helps to check the mounting position of the
camera head. This is described in the Setup and Assembly Manual.
— The laser line is used to guide the user in positioning the document. The document
should be positioned somewhere on the book cradle plates, oriented toward the
center of the scanner. The laser line must cross the document preferably in an area
that is not too dark.
— The user should align the document content in respect to the laser line. The automatic
format detection will crop the document to a rectangular size but it cannot compensate
for any skew.
Picture 50: Correct versa incorrect placement
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