一种双摄像头无线胶囊内窥镜系统设计

Double Cameras Wireless Capsule Endoscope System Design

为了降低无线胶囊内窥镜在食管和大肠检测中图像信息的漏检率,该文提出了一种双摄像头胶囊内窥镜系统,并给出了系统结构和工作流程。同时提出了基于休眠-唤醒模式检测的低功耗技术,在基于高斯分布模型的概率检测方法下,平均检测次数为14.35次,平均漏检时间为6.53 min,降低了系统的功耗。同时,文中提出了一种高压缩比,低复杂度的胶囊内窥镜图像压缩技术,经过实验,图像压缩率可达88%(峰值信噪比PSNR可达39dB)。最后给出了硬件系统的实现,并进行了仿真,仿真结果表明该系统在休眠模式下功耗为33μW,在4 fps连续采样时的功耗为21 mW,在40 fps连续采样时的功耗为163 mW。

In this paper,in order to lower the miss rate of the wireless capsule endoscope(WCE)for esophagus and large intestine,we have proposed a double cameras WCE system,and we have showed the system architecture and the work flow.In the meantime,we have proposed low power methods based on sleep and wake up mode.We have got an average detection times of 14.35,and an average miss time 6.53 minutes.We have also proposed an image compression algorithm for WCE with a high compression rate and low complexity.Through the experiment the image compression rate can reach 88% peak signal-to-noise ratio(PSNR can amount to 39 dB).In the end,we have showed the realization of the hardware system.The experiment showed that the power consumption of the system is 32.5 μW in sleep mode,21 mW at a 4fps rate,and 163 mW at a 40 fps rate,respectively.