1. A computerized method of profiling a shear flow near an interface comprising: receiving first and second images of a plurality of particles in the shear flow near the interface wherein the images are generated at successive time instants; determining a set of potential particle motion vectors based on the received images; dynamically ranking the potential particle motion vectors based on motion vector density; matching particles in the first image to particles in the second image based on the dynamic ranking; and generating a velocity profile about the interface based on the particle matching.