Computes the change in location of a set of feature points between two successive image frames using the pyramid-based Lucas-Kanade algorithm.
Reference to the current source image.
Reference to the previous source image.
Array of points that need to be tracked.
X-coordinate of the point.
Y-coordinate of the point.
Options that are used to track the features between two successive frames.
Number of pyramid levels to use.
Number of iterations to run the tracking algorithm at each level.
Region around each input feature point that is used to search for a match.
Minimum allowed displacement between the location of the tracked features from iteration to iteration. That is, if the position of a feature does not move more than the displacement threshold from its location on a previous iteration, the current location of the feature is finalized and it is not tracked anymore.
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Default: No error
Coefficients of the filter that is used to smooth the image. The kernel coefficients must be symmetric.
Duplicate of the input current frame.
Distance between feature points in and feature points out.
Array of points that represent the new locations of the input feature points in.
X-coordinate of the point.
Y-coordinate of the point.
Error information.
The node produces this output according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Where This Node Can Run:
Desktop OS: Windows
FPGA: Not supported
Web Server: Not supported in VIs that run in a web application