sift:curve_registration:curve_registration_for_biomechanical_waveforms
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| sift:curve_registration:curve_registration_for_biomechanical_waveforms [2024/07/12 13:58] – created sgranger | sift:curve_registration:curve_registration_for_biomechanical_waveforms [2024/07/17 15:44] (current) – created sgranger | ||
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| Curve registration has been proven to aid in analysis of biomechanical signals, and can produce more accurate results in time continuous analysis including PCA, due to sensitivity towards time varying events. When looking at a signal in a dataset, we typically see variation in the amplitude and phase. When physical time may not impact or be relevant to real life systems, there is sometimes a need to align the curves on a system time rather than a clock time to correct phase variation. This is done by registering the curves to a specific landmark. In the world of biomechanics and gait analysis, we can register curves by certain events, such as the max or min of a signal to see a better representation of amplitude variation. To review supporting literature, see [[[https:// | Curve registration has been proven to aid in analysis of biomechanical signals, and can produce more accurate results in time continuous analysis including PCA, due to sensitivity towards time varying events. When looking at a signal in a dataset, we typically see variation in the amplitude and phase. When physical time may not impact or be relevant to real life systems, there is sometimes a need to align the curves on a system time rather than a clock time to correct phase variation. This is done by registering the curves to a specific landmark. In the world of biomechanics and gait analysis, we can register curves by certain events, such as the max or min of a signal to see a better representation of amplitude variation. To review supporting literature, see [[[https:// | ||
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| === Example 1: registering to local max/min === | === Example 1: registering to local max/min === | ||
| - | {{CurvRegKnee.png}} | + | {{:CurvRegKnee.png}} |
| In this example we selected the **KneeAngleX** query to be registered. | In this example we selected the **KneeAngleX** query to be registered. | ||
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| Here we can see the difference between the original curves (left), and the registered curves (right). | Here we can see the difference between the original curves (left), and the registered curves (right). | ||
| - | {{CurvRegKnee2.jpg}} | + | {{:CurvRegKnee2.jpg}} |
| === Example 2: registering to intermediate event === | === Example 2: registering to intermediate event === | ||
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| Here we can see the difference between the original curves (left), and the registered curves (right). | Here we can see the difference between the original curves (left), and the registered curves (right). | ||
| - | {{CurvRegAnkle.jpg}} | + | {{:CurvRegAnkle.jpg}} |
| ==== Exporting Results ==== | ==== Exporting Results ==== | ||
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| Curve registration results can be exported as an image, or as text file containing all data points. To export an image of the plot, right click on it to show the context menu. In the context menu select Export. A dialog will appear allowing you to choose which type of image you want it exported as, and what size. | Curve registration results can be exported as an image, or as text file containing all data points. To export an image of the plot, right click on it to show the context menu. In the context menu select Export. A dialog will appear allowing you to choose which type of image you want it exported as, and what size. | ||
| - | To export the data go to the {{sift_export_results.png}} **Export Results** tab on the tool bar to prompt the [[Sift: | + | To export the data go to the {{:sift_export_results.png}} **Export Results** tab on the tool bar to prompt the [[Sift: |
| ===== References ===== | ===== References ===== | ||
sift/curve_registration/curve_registration_for_biomechanical_waveforms.1720792706.txt.gz · Last modified: 2024/07/12 13:58 by sgranger