Hardware manual

Unwrap Impact Reference Guide
Datalogic Automation Inc. 3-64
Unwrap
In the Image Geometry Drawer
The Unwrap tool can be used to straighten text in the shape of an arc so it can be analyzed with the OCR
tool. A typical application is unwrapping circular text on a coin or other round object.
This tool uses a wide circular ROI to specify the sampled region. The width of the ROI determines the
height of the unwrapped image.
A boolean value can be set to indicate whether the sample direction should put the outside or the inside of
the arc on top in the resulting image. For example, if you are inspecting text at the top of the coin, set the
sample direction so the outside of the arc is on top.
Unwrapped sampling can cause character distortions when the inside arc is stretched and the outside arc is
compressed. The distortion is worse for tighter arcs.
False True True False 1 3
24
False True False True 2 3
14
False True False False 2 4
13
False False True True 4 1
32
False False False True 3 2
4 1
False False True False 3 1
42
False False False False 4 2
31
Input Name What it is
Input Image Linked Image
Tool Origin The tool’s origin relative to the entire image space.
Arc Region The desired region of the image to unwrap. The parameters are x coordi-
nate, y coordinate, radius, start angle, cover angle, and width.
Sample Direction Indicates whether the outer or inner arc of the Arc Region is on the top of
the text.
Output Name What it is
Output Image The unwrapped image (may be viewed on the Output Image tab).
Row Major
Order
Major
Forward
Minor
Forward
Serpentine Stitched Image
Order