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BTK Python wrapper
0.3dev.0
Python bindings for the Biomechanical ToolKit library (BTK)
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Transform force platform data into ground reaction wrenches. More...
Public Member Functions | |
| def | GetInput |
| def | GetInputNumber |
| def | GetOutput |
| def | GetOutputNumber |
| def | GetThresholdState |
| def | GetThresholdValue |
| def | GetTimestamp |
| def | GetTransformToGlobalFrame |
| def | GetValidInputNumber |
| def | ResetState |
| def | SetInput |
| def | SetThresholdState |
| def | SetThresholdValue |
| def | SetTransformToGlobalFrame |
| def | Update |
Transform force platform data into ground reaction wrenches.
Transform force platform data into ground reaction wrenches. Theses wrenches are expressed in the global frame. The point of application (PWA) of each wrench is calculated from the paper of Shimba (1984). Compared to the center of pressure (COP), the PWA take into account all the forces and moments (and does not assume any null forces). Note: For gait analysis, the COP and PWA are very similar. Because the computation of the PWA (as the COP) is sensitive to small (vertical) forces, the methods SetThresholdValue and SetThresholdState() are provided to not compute the PWA if the vertical forces is the threshold. You first need to set the value and then activate the threshold method. By default, this threshold is not activated and the values is set to 0. # Example grwf = btk.btkGroundReactionWrenchFilter() grwf.SetThresholdValue(5.0); # 5 newtons grwf.SetThresholdState(true); Finally, you can also use the method btkGroundReactionWrenchFilter::SetTransformToGlobalFrame() to have the wrench expressed in the frame of the force platform.
| def btk.btkGroundReactionWrenchFilter.GetInput | ( | self | ) |
GetInput(self) -> btkForcePlatformCollection Gets the input registered with this process.
| def btk.btkGroundReactionWrenchFilter.GetInputNumber | ( | self | ) |
GetInputNumber(self) -> int Returns the number of inputs.
| def btk.btkGroundReactionWrenchFilter.GetOutput | ( | self | ) |
GetOutput(self) -> btkWrenchCollection Returns the output created with this process.
| def btk.btkGroundReactionWrenchFilter.GetOutputNumber | ( | self | ) |
GetOutputNumber(self) -> int Returns the number of outputs.
| def btk.btkGroundReactionWrenchFilter.GetThresholdState | ( | self | ) |
GetThresholdState(self) -> bool Returns the state of the threshold used to suppress false PWA.
| def btk.btkGroundReactionWrenchFilter.GetThresholdValue | ( | self | ) |
GetThresholdValue(self) -> double Returns the value used to suppress PWA computed with a Fz value lower or equal than it.
| def btk.btkGroundReactionWrenchFilter.GetTimestamp | ( | self | ) |
GetTimestamp(self) -> unsigned long Returns the timestamp of the object.
| def btk.btkGroundReactionWrenchFilter.GetTransformToGlobalFrame | ( | self | ) |
GetTransformToGlobalFrame(self) -> bool Returns the state of the activation for the computation of the wrenches in the global frame.
| def btk.btkGroundReactionWrenchFilter.GetValidInputNumber | ( | self | ) |
GetValidInputNumber(self) -> int Returns the number of inputs which are valid (i.e. not null).
| def btk.btkGroundReactionWrenchFilter.ResetState | ( | self | ) |
ResetState(self) Reset the state of the process. Usefull when an exception was thrown during the generation of the data.
| def btk.btkGroundReactionWrenchFilter.SetInput | ( | self, | args | ) |
SetInput(self, btkForcePlatform) SetInput(self, btkForcePlatformCollection) Sets the input required with this process.
| def btk.btkGroundReactionWrenchFilter.SetThresholdState | ( | self, | |
activated = False |
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SetThresholdState(self, activated=False) SetThresholdState(self) Sets the threshold state.
| def btk.btkGroundReactionWrenchFilter.SetThresholdValue | ( | self, | args | ) |
SetThresholdValue(self, double) Sets the threshold value.
| def btk.btkGroundReactionWrenchFilter.SetTransformToGlobalFrame | ( | self, | |
activation = False |
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SetTransformToGlobalFrame(self, activation=False) SetTransformToGlobalFrame(self) Activate or deactivate the computation of the wrenches in the global frame.
| def btk.btkGroundReactionWrenchFilter.Update | ( | self | ) |
Update(self) Update the pipeline and then all the data inside. Recursive method which 1) determines the processes to update 2) generate the data by using the GenerateData() method.
1.8.5