I. Introduction
Smart lighting is a research area with an increasing trend, especially in its focus on increasing energy efficiency [1]. There are two main strategies for increasing energy efficiency in lighting systems: (1) By dimming the lights when the light is bright enough (2) By turning off the lights when no one is present [2]. Several studies already exist regarding the second strategy, one of which is with the camera and image processing which can detect when a user is present and exercise control according to the image processing results [3]. However, there is a concern when using the camera in smart lighting, namely whether the use of the camera violates privacy or not.