*2.1. Hardware: Capture, Storage and Processing Devices*

The hardware only implemented as a capture device in [1] was integrated and used in the current study as a capture, processing, and storage system. It consists of three parts: near-infrared camera (sensor for the capture) near-infrared Printed Circuit Board (PCB, LED illumination) and small computer (processor and storage). The camera selected and modified was the commercial USB webcam Logitech® HD Webcam C525 [30]. For the infrared lighting, a PCB with eight infrared LEDs (OSRAM© SFH 4715 A [31], 850 nm) was designed and manufactured. In the current work, the small computer Raspberry® Pi 4 Model B [32] was used, instead of the Raspberry® Pi 3 Model B [33] of [1], for VBR processing and database storage.
