3-2 Operating Modes
3.3 Dual 2-D Adaptive Enhancement & Thresholding
The PANORAMA Monochrome Scanner supports Dual 2D-Adaptive
enhancement processing on the foreground and background
separately. Processing is performed on-the-fly without the need for
investigative pre-scanning. Enhancement processes are
simultaneously performed on different drawing aspects.
Dual 2D-Adaptive enhancement processing features include ADL+
error diffusion halftoning, 2D-Adaptive foreground thresholding, 2D-
Adaptive background suppression and 2D-Auto edge enhancement.
Dual 2D-Adaptive scanning is based on high-speed embedded Digital
Image Processing (DIP) performing two-dimensional analysis on the
graytone information of each pixel in relation to its neighboring pixels,
in real-time while scanning the drawing.
The scanner simultaneously addresses all 3 levels of image
processing necessary to extract clean data from difficult drawings.
This is done on-the-fly and without need for pre-scanning the drawing:
1. Foreground data - Advanced two dimensional adaptive
algorithms based on neighborhood pixel analysis separating data
and background in a variable-sized area around the pixel (area
size is varied in order to render the background separation
statistically significant).
2. Background Suppression: Adaptive two-dimensional
suppression of background is performed independently of the
foreground algorithm.
3. Global level - Using a binary tree algorithm, the thresholds of the
foreground and background levels are correlated with the
surrounding areas in order to make the threshold fit seamlessly.
3.4 B/W Modes
In this mode, the PANORAMA Monochrome Scanner outputs each
scanned pixel as a single bit, either black (1) or white (0), depending
on whether its gray level is below or above the threshold.
The B/W 2D-Adaptive mode is another Dual 2D-Adaptive mode
incorporating 2D-Adaptive thresholding and 2D-Background
suppression. This mode is suitable for normal originals when scanning
to file.
Fixed level thresholding mode is also supported.
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