Design And Implementation Of Image Processing System For Retinal Prosthesis

With the development and progress of medical technology, material technology and the computer technology, more and more artificial organs has been widely used in medical treatment and nursing. Vision is the main channel for human to acquire outside information, however, because of the innate and acquired, a lot of people need a way to restore vision. Retinal prosthesis is a kind of artificial organs that can let the blind and visually impaired patients restore visual. Because it has great medical, scientific research value and broad market, the visual prosthesis is a hot research field in recent years.The research work and the main results of this article are as follows:(1) On the study of the theory and structure of the image processing system for retinal prosthesis and standards, the development process of image processing system is designed, and the implementation of the structure and principle of the image processing system for retinal prosthesis is analyzed.(2) To study the image processing of retinal prosthesis, algorithms are put forward with the combination of these requirements, and they are learned in detail, especially phosphene simulation algorithm.(3) According to the design process in MATLAB, image processing algorithm in MATLAB simulation of retinal prosthesis is completed. It verified the effectiveness of the algorithms are suitable for the retinal prosthesis. To complete image acquisition,a GUI image acquisition interface is designed. And the design of algorithm of image edge extraction; low pixeletion; phosphene simulation are completed.(4) According to the composition of retinal prosthesis, the following modules are completed. The I2 C bus control camera image acquisition module; The MPMC storage module controls SDRAM to be read and written; HDMI interface is used in display module. Also the image pre-processing is finished, including the design of the brightness contrast distortion degree, the control of color, graphics, statistics and Settings, and so on, through these processing, provided a basis for the next step of image processing.(5) Adopts modular design, combining with the System Generator the models of various image processing are designed in the Simulink. A single figure of the realization of the retinal prosthesis effects processing is completed. The core module of 2D-FIR is designed, it consists of 5x5 Line Buffer and Filter. Finally these modules are made into a sub-module into the XPS project, thus to realize the image processing System of retinal prosthesis on FPGA.The key point and improvement of this article lies in:(1) Completed and implemented a design of image processing system for retinal prosthesis based on FPGA instead of traditional design based on DSP;(2) To achieve a 32 x 32 total 1024 microelectrodes high resolution image processing system for retinal prosthesis, the resolution is improved.