PyDDM.ddm_calc.getVel_phiDM

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PyDDM.ddm_calc.getVel_phiDM#

getVel_phiDM(phase, dt, pixel_size, framerate, halfsize=5)#

With phiDM, get the velocity by fitting the difference in phase of Fourier tranformed images separated by some lag time (dt) to a plane.

Parameters:

  • phase (ndarray) – Phase of the Fourier transform of each image in image stack

  • dt (int) – Lag time in frame for which the displacement will be found.

  • pixel_size (float) – Pixel size

  • framerate (float) – Number of frames per second

  • haflfsize (int, optional) – Deafult is 5. The phase difference is fit to a plane centered on the zero frequency.

Returns:

  • vxs (ndarray) – Array of velocities in x

  • vys (ndarray) – Array of velocities in y

  • errs (ndarray) – Mean error per pixel from the plane fit

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