The Study Of Distributed Eye-mouse System Based On Cell/B.E.

Eye-mouse is a computer assistant device, which helps the people whose arms are disabled to control PC by eyes instead of hands. In order to track eyes, the system has to locate eyes first. But the algorithms of eye location with height precision cost heave computation that is unacceptable for a real time system. So we design the distributed eye-mouse system, and let computation part run on Cell/B.E.(CBE) serve.There are two parts consist of the system, client and CBE serve. The control tasks such as image capturing, eyes motion judging and mouse driving run on client, and the the computation tasks of eyes locating run on serve. Sequentially, the system can be divided into three phases, background processing, fiducial position locating and real time controlling. In the background processing phase, background image is transformed to gray image. The fiducial position phase adopts gray-level projection model to locate eyes and estimate the gray threshold of eyes. The controlling phase adopts binary segmentation model to lacate eyes, and compare to the fiducial position to drive the mouse motion. There are 8 SPEs and 1 PPE in a CBE processor. In our system, PPE takes the control tasks such as network and SPE scheduling, and SPEs take the computation task. PPE makes the steps of eyes locating as several functions computed by SPEs separetely. The vector computation could process 16 byte data simultaneously, which is the first level parallel. When there are several requests of clients, SPEs could work for clients concurrently. This is the second level parallel.The system is special for the devidsion of eyes which locating computation part and control part. The computation part runs on the CBE serve to speedup, moreover, this CBE applition is a base for the further research.