Deskew; Electronic Color Dropout; Fixed Thresholding; Halftone Removal - Kodak i700 Series Product Information

Deskew — Multi-bit (Color/Grayscale/Black and White)
The skew detection and correction subsystem performs accurate deskew on the 8-bit image in
each channel (RGB and grayscale) in the i700 Series Scanners. The front, rear, and simultaneous
outputs are deskewed independently providing maximum accurate deskew, all done at full
machine speed. It is important to note that deskew is based on the document edges not the
content within the document. This provides an assurance that document information will not be
lost.
The new algorithm is also less sensitive to background noise and provides for deskew at an angle
up to 45 degrees with an accuracy of ± 0.3 degrees. (Since it takes longer to deskew a document
with a higher degree of skew, the feeder is designed to throttle while the image is deskewed.)

Electronic Color Dropout

Electronic color dropout is used to eliminate a form's color background so that a document
management system may automatically (through OCR or ICR technology) read pertinent data
without interference from the lines and boxes of the form. The i700 Series Scanners can drop out
either red, green or blue. The dropout color selection (R, G, B) is changeable at the host. The
scanner does more than just drop out the color. The selected dropout color is fine-tuned for
optimal image quality through a simple operator setup procedure.
The i700 Series Scanners use electronic color dropout, meaning there is no lamp change or filter
change required to change the dropout color.
The i700 Series Scanners can be configured to output black and white images with the selected
color dropped out, but also output the full-color image.

Fixed Thresholding

Fixed thresholding is used for black and white and other high-contrast documents. A single level
is set to determine the black and white transition. This threshold is programmable over the entire
density range. When Contrast is set to zero, Threshold is fixed. When Contrast is set to 100,
Threshold is fully dynamic. Usually a setting in between these numbers produces the best results.
Fixed thresholding is used where the desired output is consistent vs. variable as with ATP.
Testing should be performed to find the best fixed threshold level in these types of applications.
Fixed thresholding may not be used when adaptive thresholding or dithering is selected.

Halftone Removal

Used to enhance images containing dot matrix text and/or images printed with shaded or colored
backgrounds using halftone screens. This filter effectively reduces background noise.
January 2009 17