基于听觉通路的盲人无损视觉补偿系统

Non-invasive Prosthetic Vision System for the Blind via Auditory Pathway

针对盲人群体的视觉补偿问题,提出了一种基于听觉通路的盲人无损视觉补偿系统.该系统采集周围的环境信息,先利用带优化截断的嵌入式方块编码(embedded block coding with optimized truncation,EBCOT)方法对环境信息编码,再利用小波变换对感兴趣区域(region of interest,ROI)编码.编码后的环境信息经传输、解码,得到重建的图像数据.按照极坐标扫描重建的图像数据,将图像中像素点的坐标信息和灰度值映射成声音信号的时间、频率及幅度,按正弦波模型合成声音信号.结果表明,采用EBCOT,图像编码速度快,能获得较多的信息量,提高传输速率;用极坐标方式扫描图像数据映射成的声音信号有较好的可辨别性.

Proposes a non-invasive prosthetic vision system via auditory pathway for blind people. The system acquires the surrounding information to which the EBCOT （embedded block coding with optimized truncation） algorithm is used before using the wavelet transform to code ROI （region of interest）. Then, the data for image restructuring are obtained via the surrounding information transmission and decoding. The data are scanned in terms of polar coordinates, from which the coordinate information on each and all pixels and their gray levels in an image are mapped into the time, frequency and oscillation amplitude of acoustic signals which are then synthesized together in sine-wave form. The results showed that the image data can be coded and transmitted quicker to acquire more information if using EBCOT algorithm, and the acoustic signals have better recognizability if scanning image data in terms of polar coordinates for mapping