**1. Introduction**

In the field of human-computer interaction, there has been a wealth of related research on improving computer input efficiency, including voice input and gesture input, and among which interaction technologies based on common spaces and interaction technologies based on gesture recognition have also been commercialized and applied. Therefore, it is necessary to study the space operation range commonly used by users and combine the advantages of air gesture operation to obtain a new type of human-computer interaction input channel to improve the interaction experience and efficiency.

Spatial gestures and related recognition techniques have been widely used in various scenarios, such as intangible user interfaces and large-screen interactions. Generally, those gestures are to be executed by users in spatial areas within easy reach. Movement of the hands as a change of 3D positional data is an increasingly important input modality for computer interaction. In this mode, users often move their hands up and down in space to achieve a corresponding purpose.
