Pixel size effect on Digital Image Correlation

Interactive Tech Note
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When attempting to correlate small particles the size of the image sensors pixel has a dramatic effect on correlation results. Please see the examples below as to why this occurs.

As can be seen from the Pixel values and the correlation examples the larger pixel size makes it very hard to correlate particle size and particle speed (no speed difference between frame 3 and frame 4)

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Pixel size effect on Digital Image Correlation

Automotive TestingAirbag, Component, Off Sled, On Sled, Pedestrian Safety, Seat Testing, Sled Impact, Tire Testing, Train Testing, Vehicle Impact

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Automotive Testing
Airbag, Component, Off Sled, On Sled, Pedestrian Safety, Seat Testing, Sled Impact, Tire Testing, Train Testing, Vehicle Impact

Ballistics
Bullet Proof Vest, Explosions, Gun Shell Ejection, Muzzle Exit, Rockets, Shockwave

Manufacturing
Bottling, Boxing, Canning, Capping, Cutting, Filling, Labelling, Milling, Sorting

Media Arts
Commericals, Art, Documentaries, Special Effects, Equestrian, Flight, Sports

Scientific Research
Arc Discharge, Bubble Flow, Cavitation, Microscopy, Particle Vibration, PIV, Spray, Tensile Test, Welding, X-Ray, Acceptance Testing, Development, Drop Testing, Function Testing, 3D