Dear Pradipta Vaskar Biswas ,

Look the link, maybe useful.

Article recognition of shape-changing hand gestures

Regards,

Shafagat

Its hard to answer your question------ lake full description, type of sensors, change is in mm or greater, hardware limit and so on.

Anyhow check this article, I think it has good explanation.

https://kilthub.cmu.edu/articles/journal_contribution/On_3D_Shape_Similarity/6557063/files/12039338.pdf

And some good info in this article,

https://graphics.stanford.edu/courses/cs468-01-fall/Papers/osada_funkhouser_chazelle_dobkin.pdf

If you want to try camera scanning try this,

http://www.makerscanner.com/docs/1-makerscanner.html

This is opensource and well documented. You can convert your model into different file format with Meshmixer software which we can use for comparison.

Usually that is done by placing multiple sensors at strategic points to get an overview of the boundary or contour of the object and then using statistical techniques to represent it using mathematical feature vectors.