Hand gesture-based interaction provides a natural and powerful means for human-computer interaction. It is also a good interface for human-robot interaction. However. most of the existing proposals are likely to fail when they meet some skin-coloured objects. https://www.aitsglobal.com/product-category/%d7%97%d7%a4%d7%a6%d7%99-%d7%90%d7%95%d7%9e%d7%a0%d7%95%d7%aa/