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Universal Calibration Slide for Machine Vision, Image Analysis

A user note for SPS20, a universal calibration slide for machine vision and image analysis - pattern description.
ID Pattern Name Location Description
A Concentric Circles X = 2
Y = 10
1, 2, 3, 4, 5mm Circles with Cross Line and circle identifier. Line width 20µm
B Concentric Squares X = 10
Y = 10
1, 2, 3, 4, 5mm Squares with Cross Line and circle identifier. Line width 20µm
C Line Grating
25 lines / mm
X = 18
Y = 10
25 line pairs per mm - (40µm line 40µm space)
D Line Grating
100 lines / mm
X = 26
Y = 10
50 line pairs per mm - (10µm line 10µm space)
E Half Protractor X = 34
Y = 10
15° spacing - line width 20µm
F Grid Array
Coarse
X = 40
Y = 10
5mm square array with 0.5mm divisions and central 2mm square with 0.25mm divisions - line width 20µm
G Grid Array
Fine
X = 48
Y = 10
5mm square array with 0.1mm divisions and central 2mm square with 0.05mm divisions - line width 8µm
H Dot Array X = 56
Y = 10
Dot diameter 0.25mm Dot centre spacing 0.50mm - 11x11 grid = 121 dots
I Geometric progression of
Opaque Dots
X = 2
Y = 4

Line array of dot or square shapes. of either clear or opaque. Reducing in size Root 2 progression for the purposes edge threshold detection to enable a image analyser to measure the size correctly, or general shape size comparison.

Root 2 progression of 21 dots or square shapes, from 3.5µm to 3.5mm

Nominal size in mm
Dot / square size - Large to small in mm
3.5833; 3.5338; 1.7917; 1.2669; 0.8959; 0.6335; 0.4479; 0.3167; 0.2240; 0.1584; 0.1120; 0.0792; 0.0396; 0.0280; 0.0198; 0.0140; 0.0090; 0.0070; 0.0049; 0.0035

J Geometric progression of
Opaque Squares
X = 17
Y = 4
K Geometric progression of
Clear Dots
X = 32
Y = 4
L Geometric progression of
Clear Squares
X = 47
Y = 4
M Vertical Scale Fine Variable X = 63
Y = 2
Overall Scale length 10mm.
5mm in 0.5mm divisions - line width 20µm
4mm in 0.1mm divisions - line width 10µm
1mm in 0.01mm divisions - line width 3µm
N Horizontal Scale Coarse X = 0
Y = 0
Scale length 62mm long 2mm divisions, sub divided in 1mm divisions with a 20µm line width.
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