Research on a vision chip based on biological systems

为了开发视觉LSI的基本技术，基于生物视觉系统对基本器件、电路和网络进行了研究，并开发了一种模拟集成电路，在其中实现了外部视网膜的功能。利用MOS通道电阻连接所有光感受器，实现了一个简单的网络。通过改变栅极电压来执行全局适应。在运动检测方面，基于昆虫机构建立的相关模型，设计并制作了基本的模拟集成电路。结果，在一维空间中检测到移动光点的方向和速度。研究了二维空间运动检测的基本电路，建立了运动检测所必需的目标跟踪模型。通过计算机仿真验证了平滑跟踪的有效性。设计了模型的基本电路，并通过SPICE仿真验证了其正常工作，并利用现有的精细图形技术对这些网络进行了重新设计，以增加集成规模。在庆福国立大学，基于视网膜外部的基本网络，设计并制造了一种大规模集成电路。两所大学在视觉芯片的设计、制造和评估方面进行了合作。这项研究的结果在国际会议和期刊上公布。

Research on fundamental devices, circuits and networks was carried out based on biological vision systems in order to develop basic technologies for vision LSIs.An analog integrated circuit was developed into which the function of an outer retina was implemented. A simple network was realized by utilizing a MOS channel resistance connecting all photoreceptors. Global adaptation was performed by varying a gate voltage. A fundamental circuit for local adaptation was also developed.For motion detection, a basic analog integrated circuit was designed and fabricated based on the correlation model constructed with the mechanism of an insect. As a result, the direction and speed of a moving light spot were detected in an one-dimensional space. A basic circuit was also studied for motion detection in a two-dimensional space.A model for target tracking was constructed, which is essential for the motion detection. Smooth pursuit was confirmed by computer simulation. Fundamental circuits for the model were designed and their normal operation was confirmed by SPICE simulation.These networks were redesigned to increase the scale of integration using a current finepattern technology. They are going to be fabricated through VDEC.In Kyungpook National University, a large-scale integrated circuit was designed and fabricated based on the fundamental network of the outer retina. Both universities collaborated for design, fabrication and evaluation of vision chips. Results of the research were presented at international conferences and in journals.