Methods, systems, and computer programs are presented for detecting inputs for a computing device. One method includes an operation for receiving images for an area where the hand of a user is situated, and an operation for analyzing the received images to determine the location and the color of a finger of the user. Further, a change in the color of the finger is detected, where the change in the color is caused by contact of the finger with a physical object. In other operation, the method determines the location of the finger when the color change was detected. The determined location is associated with an input for the computing device.
Detection of interaction with virtual object from finger color change