论文标题
电动轮椅控制
An Intelligent and Low-cost Eye-tracking System for Motorized Wheelchair Control
论文作者
论文摘要
在34个发展中国家和156个发展中国家中,大约有1.32亿残疾人需要轮椅,占全球1.86%的人口。此外,有数百万患有与运动障碍有关的疾病的人,这些疾病无法在任何四肢甚至头部中产生受控运动。该论文提出了一种系统,通过不必依靠其他利用眼轮控制的电动轮椅来帮助有效,毫不费力地移动的系统来帮助有运动障碍的人。系统输入是用户眼的图像,这些图像是为了估算凝视方向的处理,并相应地移动了轮椅。为了完成这样的壮举,开发,实施和测试了四种用户特定的方法;所有这些都是基于作者创建的基准数据库。前三种技术是自动的,使用相关性并且是模板匹配的变体,而最后一个使用卷积神经网络(CNN)。计算了定量评估每种算法的性能的不同指标,以准确性和潜伏期的形式进行了计算,并提供了整体比较。 CNN表现出最佳性能(即99.3%的分类精度),因此是凝视估计器的首选模型,它指挥轮椅运动。仔细评估了该系统的8位受试者,在室外和室内改变照明条件方面的精度达到99%。这需要修改机动轮椅,以使其适应凝视估计算法的预测输出。如果测得的距离低于定义明确的安全边缘,则轮椅控制可以绕过视线估计器做出的任何决定,并在一系列接近传感器的帮助下立即停止运动。
In the 34 developed and 156 developing countries, there are about 132 million disabled people who need a wheelchair constituting 1.86% of the world population. Moreover, there are millions of people suffering from diseases related to motor disabilities, which cause inability to produce controlled movement in any of the limbs or even head.The paper proposes a system to aid people with motor disabilities by restoring their ability to move effectively and effortlessly without having to rely on others utilizing an eye-controlled electric wheelchair. The system input was images of the users eye that were processed to estimate the gaze direction and the wheelchair was moved accordingly. To accomplish such a feat, four user-specific methods were developed, implemented and tested; all of which were based on a benchmark database created by the authors.The first three techniques were automatic, employ correlation and were variants of template matching, while the last one uses convolutional neural networks (CNNs). Different metrics to quantitatively evaluate the performance of each algorithm in terms of accuracy and latency were computed and overall comparison is presented. CNN exhibited the best performance (i.e. 99.3% classification accuracy), and thus it was the model of choice for the gaze estimator, which commands the wheelchair motion. The system was evaluated carefully on 8 subjects achieving 99% accuracy in changing illumination conditions outdoor and indoor. This required modifying a motorized wheelchair to adapt it to the predictions output by the gaze estimation algorithm. The wheelchair control can bypass any decision made by the gaze estimator and immediately halt its motion with the help of an array of proximity sensors, if the measured distance goes below a well-defined safety margin.