Towards a Low-Cost Mobile Subcutaneous Vein Detection Solution Using Near-Infrared Spectroscopy

Figure 3

High level conceptual model and architecture of the prototype, embedded in a wireframe of one of the target devices (smartphone). (1) Attachment which comprises a standard (converted to be NIR sensitive) USB camera and 4 NIR LEDs for the illumination of the target area (e.g., hand). (2) Illustration of 1 NIR LED illumination distribution, with the most luminous intensity around the center. (3) Micro-USB connection cable (data transmission and power supply for the attachment). (4) Software libraries (camera usage and management, image processing) written in the native Android layer (for performance optimizations). (5) User interface software components. Both (4) and (5) will be developed as a single Android-based mobile application applicable to mobile devices running Android OS version 4.0.3 (ICS) or above.