Table of Contents
Advertisement
HD Ultra X Service Guide
10. Scanner Terms
Activation Code
Is the when the product specific License code has been pared with a Scanner serial no.
AdaptiveThresholding
Advanced 2-D Adaptive Thresholding estimates the background gray level in a window area around each
pixel. The difference between the actual pixel value and the background is then compared to the adaptive
settings to determine if a pixel is threshold as a black or a white pixel.
Additive Colors
The additive primary colors are red, green and blue. These additive primaries represent the three main
components of white light. Used individually or together, these three colors of light can be mixed to create
nearly all colors. When these three primary colors are mixed in equal parts they produce white. Additive
color is used in scanners and computer displays.
ADL+ Error Diffusion Half toning
Image Processing that supports visibility of graytones in printed output by adding toned shades of gray in
regions between black and white. Carried out as a segment of Dual 2D-Adaptive enhancement processing
in copy modes.
ALE - Accuracy Lens Enhancement
Accuracy Lens Enhancement (ALE) is an electronic correction of spherical errors in CCD based camera-
scanning systems. When looking at pixels across the range of a camera, the pixels tend to be more
elliptical at the outside edges of the lens and more round in the middle of the lens. This anomaly is known
as a spherical lens error and can introduce inaccuracies in the scanning system that can vary quite
substantially between different points along the scan line. Most manufactures typically state a +-0.1%
accuracy of the scanner between the two outermost end-points of the scan line. However, when
measuring between two points that do not fall across the entire scan line, it is not unusual to see variations
of up to +- 0.5% or even higher. This is naturally unacceptable in demand-ing environments and markets
such as GIS, which need a stable and well-defined maximum error of 0.1% or less. ALE solves this
problem by a process to electronically correct the spherical errors in the scanner and maintain a stable
maximum error across any two points of less than 0.05% ± 1 pixel.
OTAC
Automatic Thickness Adjustment Control - A special technology that allows the scanner pressure platen to
be raised to accommodate thick originals and then lowered - both actions performed by pressing a key
from the operator's panel. Sensors in the platen detect when perfect pressure is applied to the original and
automatically stop the downwards motion of the platen so it rests on the original with an optimal grip.
Bitmap
An image format made from a matrix of individual pixels.(.bmp)
Bitmapped Image
A bitmapped image is a computer file representing a line-art image that was scanned with a scanner.
Refers to the pattern (map) of bits that are either black or white.
Black Level
Page 122
Advertisement
Table of Contents
