SPS20 Universal Calibration Slide for Machine Vision, Image Analysis

Created by Nicole Smith, Modified on Fri, 3 May at 10:37 AM by Kathleen Patrick

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.