Source
Although in recent years the screen size of the phones has grown significantly, it is still much smaller than a standard keyboard, which forces us to type with only one or two thumbs.
Although something similar has been tried for a long time by means of infrared keyboards, which detected the movement of the fingers on a painted keyboard on the table but, never finished curdling.
Now Samsung has developed an application for smartphones and tablets, which allows you to use any surface as a virtual keyboard.
The user writes the text normally and the camera of the device reads these movements and converts them into characters.
We must place ourselves on a flat surface while writing, for example on a table, and the smartphone or tablet should be placed so that the hands fall into the field of view of the front camera.
In the original article you have an explanatory video.
Source: engadget.com, read original article
https://www.engadget.com/2020/01/07/samsung-c-lab-selfietype/?guccounter=1&guce_referrer=aHR0cHM6Ly93d3cuZ29vZ2xlLmNvbS8&guce_referrer_sig=AQAAAJuSlaz2iVOQAQw8SgsNOuIFzt6U73eV4vLPpU1nIKqQZ50EB8_20Dp7xAwJxDP2xxFeG_EaW8xSFW7LcjU6rpkFRJQ4OrSjxTB2YMZVUkr2Xf0YTZIUxhij7_jn-XqHjD5_Xg4c7TvdrVPVD_18v20pE4KLlWZfCE2jHyJja00H
Versión en español