【作者】 田宇坤；

【导师】 柴新禹；

【作者基本信息】 上海交通大学 ， 生物医学工程， 2008， 硕士

【摘要】 我国约有877万人有视觉功能障碍。通过神经电刺激视觉通路中各段可以产生视觉感觉,也被称为光幻视,它能够传递有限但是十分重要的视觉信息,帮助盲人恢复基本视觉。研究人工视觉假体来恢复盲人视觉功能是当今科学界面临的挑战之一,其可行性已被欧美科学家所证实。本文是国家973项目《视觉功能修复的基础理论与相关科学问题研究》的人工视觉图像处理部分。本文首先提出了基于不同复杂度图像的人工视觉图像处理策略,对不同图像处理策略使用的算法进行了介绍。随后,本文介绍了对形体和简单景物识别的人工视觉仿真实验,为视觉假体图像处理系统的设计提供理论支持。然后,本文介绍了自主搭建的一套基于DM642,适用于各类视觉假体的图像系统,系统可以采用CMOS图像传感器,也可以采用CCD作为图像捕获设备,可以满足各类视觉假体图像处理方法的要求。最后,论文介绍了系统的软件编写流程并对各类图像算法在平台上进行了初步的性能评估,结果表明所设计系统完全能满足第一代视觉假体需要。更多还原

【Abstract】 There are 8.77 million persons with visual disabilities in 2006. The neural electrical stimulation could be provided at various stages to restore the vision. Each of the proposed approaches is expected to artificially generate visual sensations called phosphenes, which convey limited but crucial functional visual information. Its feasibility has already been confirmed by some Euramerican scientists. This paper is the subproject of the“973”project《Basic Research on the Key Issues of Visual Function Recovery For Blindness》.Firstly, we provide various image processing strategies used for visual prostheses based on the complexity of various images, and we Introduction the algorithm used in strategies. Secondly, this paper introduce the experiment of pixelized images of objects and simple scenes recognition using simulated prosthetic vision, We hope these results will be helpful for the researchers of visual prosthesis in rehabilitation of image recognition for blind implanted with limited numbers of stimulating electrodes. Then, we introduce a set of image processing system developed by our team based on DM642, which could applied to all types of visual prostheses. The system could uses CMOS sensor and CCD sensor as image-grabbing equipment, so that it is feasible to adapt to various image processing strategies. Finally, we present the method of the flow of software development for which are implemented on our platform, and conducted a preliminary assessment of the performance. It was found that the system can meet the demand of the first generation visual prostheses.更多还原