Embedded Three-Dimensional Surface Measurement System for Palmprint

Palmprint has proved to be one of the most unique and stable biometric characteristics. Almost all the current palmprint recognition techniques capture the two dimensional (2D) image of the palm surface and use it for feature extraction and matching. Although 2D palmprint recognition can achieve high accuracy, the 2D palmprint images can be easily counterfeited and much three dimensional (3D) depth information is lost in the imaging process. In this paper, an embedded three dimensional surface measurement system based on digital signal processor (DSP) is presented. This embedded system is based on the principle of structure light. A group of coded stripes pictures are produced and projected by a configuration tool of DSP/BIOS operating system firstly. Then, phase information is unwrapped from capture images. Finally, cloud data is calculated. Experimental results show that this three- dimensional surface measurement embedded system based on DM642 can acquire three dimensional information efficiently and effectively.