Safety device for monitoring targets in an environment

A safety device for monitoring targets in an environment, comprising:

• a main case having a front wall with a through channel delimited by a channel wall,
• an image sensor arranged in the main case,
• a lens element, comprising a lens support and an optical lens fixed to the lens support, the lens support being configured for fitting the optical lens in the through channel, the optical lens being configured to project on the image sensor an optical image of a field of view, including a portion of the environment outside the main case,
• an electronic monitoring system, arranged in the main case and in signal communication with the image sensor to receive image data, the image data comprising environment image data representing the environment, the monitoring system being configured to perform a safety function, including detecting targets in the environment from the environment image data,
• a marker element, mounted in the through channel and surrounding the lens element, wherein the marker element has at least a marker portion, shaped and positioned such that the marker portion is included in the field of view and appears in the optical image as a predetermined visual marker, the image data further comprising marker image data representing the visual marker,
• wherein the monitoring system is further configured to perform a diagnostic and/or calibration function including analyzing the marker image data.