Is matlab's optical flow object dense or sparse?

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In the description of the vision.OpticalFlow object it states:
'The OpticalFlow System object™ estimates object velocities from one image or video frame to another. It uses either the Horn-Schunck or the Lucas-Kanade method.'
Im wondering if this computes the optical flow for each pixel in the frames (i.e. dense) or does it use sparse pixels (like a grid of random pixels throughout the frame)
Thank you!

Accepted Answer

Dima Lisin
Dima Lisin on 22 Sep 2015
It computes dense optical flow for every pixel. If you have the latest version (R2015b), please try the new optical flow classes: opticalFlowFarneback, opticalFlowHS, opticalFlowLK, and opticalFlowLKDoG.
For sparse optical flow, see vision.PointTracker.

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