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Marker type: | 5-/6-spot markers (FhG-IOSB) |
| Definition: |
Marker
diameter / spot diagonal = 1.6 Single spot size = spot diagonal / 4 Spot angle = 90 deg (MXT-5) or 72 deg (MXT-6) Minimum size approx. 12 pixel |
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| Set-up: | Automatic detection in search area |
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| Tracking: |
Marker based MarkerXtrackT algorithm (FhG-IOSB) Model with affined transformation: incl. Rotation and zoom. Unambiguous detection of close neighboring markers possible applying different relative orientations |
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| Feature: |
„Crash proven“: Extremely robust with regard to variations of illumination and geometrical changes (rotation, shearing). Additionally to the position you gain the measurement value MXT angle. Measurement accuracy < 0.2 pixel |
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Spots as result of
preprocessing Detected MXT-Marker
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| Data Sheet: | FalCon etra MovXact MXT Marker |
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Marker type: | 1-spot marker |
| Definition: | Ratio marker diameter : inner diameter = 1:1 Minimum size ca. 7 pixel |
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| Set-up: | Automatic centering in search area |
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| Tracking: | Marker based DOT algorithm Model = light circular area with high contrast to the dark background |
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| Feature: | Fast automatic measuring of quite small markers Measurement accuracy < 0.2 pixel |
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Marker type: | Quadrant marker (4 segments) |
| Definition: |
High contrast between the segments (attention using yellow-black markers!) Recommended size > 15 pixel |
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| Set-up: | Automatic centering in search area |
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| Tracking: |
Marker based QUAD algorithm Model = circular symmetrical pattern |
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| Feature: |
Measurement accuracy > 0.2 pixel. Tip: avoid practical use for image analysis! |
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Marker type: | 1-spot marker with code ring (AICON) |
| Definition: |
Center marker like DOT. Additional ring with width = DOT inner diameter, Code =
number of marker Recommended size > 15 pixel |
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| Set-up: |
Automatic
centering and code detection with free search in image |
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| Tracking: |
CODE algorithm similar to DOT, additionally recognition of the correct code |
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| Feature: | Apply as control points on test fields or in tests with 3D analysis |
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Marker type: | (structured) image section (= template) |
| Definition: | Recommended size > 20 pixel |
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| Set-up: | Interactive definition of center and size |
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| Tracking: |
COR algorithm (= correlation/matching of image templates) Standard model using non-adaptive templates (static from set-up image) and translatory displacement (no rotation) |
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| Feature: |
Flexible measuring of not specially marked points. Recommended only in case of constant orientation |
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Marker type: | One single point |
| Definition: | Only coordinates of m image element |
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| Tracking: | Interactive input of the position by cursor (with sub pixel accuracy) |
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| Set-up: |
Automatic motion prediction and interactive input of the positions |
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| Feature: |
Manual measuring of scales/rulers or not signalized points. Measurement accuracy > 1/zoom magnification pixel |