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GE Inspection TechnologiesGE Inspection Technologies
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SEIFERT SABA 3000 XCR
X-ray Character Recognition
XrayXray
©2004 General Electric Company. All rights reserved.
GEIT-30068GB (6/04)
GEInspectionTechnologies.com
The SABA 3000 XCR software for X-ray Character Recognition acts as an additional
module within the SABA 3000 image evaluation system. It is designed for automatic
numeric character recognition.
The cast-on clear text information (e.g. mould numbers) is read from
the X-ray radioscopic image.
• Produced under ISO 9001 certified quality management system.
Application
Technical Data
Font ISO Standard Type in accordance with DIN 6776 B vertical, with the following deviation:
Space between numeric characters = three times the line width, user scalable,
starting from 10 mm height at 100 µm/pixel.
Font sample:
Allowable numeric characters: 0, 1, 2, 3, 4, 5, 6, 7, 8 ,9
Minimum values of numeric characters, based on an image resolution of 100 µm/pixel
and an X-ray tube current of 4 mA:
Height (nominal size) 10 mm
Width (at nominal size) 5 mm, the numeric character 1 having a 3 mm width
Line width 1 mm, (-0.1 mm, +0.4 mm)
Minimum distance between numeric characters 3 mm
Required type elevation (minimum values) with given material thickness
Material thickness [mm] 5 10 20 30
Type elevation [mm] 0.75 1 1.6 >2.4
Numeric character slant approximately 3°
Numeric character arrangement in the image rectangular relative to the image border (0°, 90°, 180°, 270°)
Deviation of the character string position from the nominal position ± 2 mm
Deviation of the rotation (within the string) from the nominal position ± 2 °
GE Inspection Technologies
Xray
In order to obtain accurate character rec-
ognition results the following prerequisites
have to be met:
• The font to be used is the ISO Stan-
dard Type for drawings in accordance
with DIN 6776 B vertical. This type is
characterized by high legibility.
• Each individual numeric character
must be distinct in shape to prevent
confusion with others.
• The distance between two numeric
characters must be three times the
line width (d).
• The numeric character height (h)
must be at least 10 mm (see
Figure 1).
• For serial inspection the numeric
characters in the image must always
appear in the same place.
• The arrangement of the numeric char-
acters in the image must be rectangu-
lar. A diagonal arrangement prevents
them from being recognized.
• The type must be highly contrastive.
The proportion of the type elevation
T1 to the material thickness T2 (see
Figure 2) must be constant through-
out the entire numeric character area
(see Figure 3) and be at least 1:10
given a numeric character height of
10 mm.
Example:
Given a 10 mm material thickness the
type elevation must be 1 mm (-0.2
mm, +0.8 mm).
• No further structures (e.g. cooling
fins) must be in the numeric character
area as they will affect results.
• In the numeric character area the
material thickness must be constant.
• As the type elevation is limited for
reasons inherent in the casting pro-
cess, the numeric characters should
be placed in workpiece areas with the
least possible material thickness. This
is the only way to ensure a sufficiently
high contrast in the X-ray radioscopic
image.
Description
Figure 1 - Dimensions for 10 mm numeric character size
Figure 2 - Proportion T1/T2
Figure 3 - Numeric character area
The following points are important for X-ray character recognition on wheels:
• The strip must not contain any other information
except for the numeric characters.
• For all wheels of one type the strip must have the
same height position.
• The number of numeric characters (3 in the example
on the right) must be the same for all wheel types to
be inspected in one plant.
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