Assessment of randomness of structured light based on Hamming distance

Structured light, such as pseudo-random spots, parallel lines and grids, is a known pattern projecting on to a scene. By catching the deformation of the structured light when it strikes on to the objects in the scene, the vision systems can calculated the depth and surface information.

For a pseudo-random-spot pattern, the randomness is critical for the performance of 3D scanners. Many methods can be used to assess the randomness of the spots. Hamming distance is one of them. The following tables shows the Hamming distance of the 210x165 structured light pattern in Kinect. For comparison, we have also shown the the Hamming distance of the structured light pattern with the same size designed by us.

Sub-window size	9x9	11x11	13x13	15x15	17x17	19x19	21x21	23x23	Sum of minimum hamming distance
Minimum Hamming distance of structured light pattern in Kinect	3	9	16	25	36	48	61	74	272
Minimum Hamming distance of structured light pattern by Wuxi OptonTech	4	10	17	26	37	49	63	79	285

It can be seen that the randomness of the structured light designed by Wuxi OptonTech is better than that in Kinect when it is assessed by the Hamming distance.

First posted March 11, 2017. Last edited August 16 2019.

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