关键词: 安全辅助驾驶, 方向盘, 操作手, 机器视觉

Abstract: A method of detecting the number of driver’s operating hands on the steering wheel based on machine vision is proposed. The first step is to confirm the position of the steering wheel in one image and to calculate the dimension parameters of the steering wheel in the oval area so as to get the coordinates of certain point on the center line of the wheel oval. The second step is to extract the region-of-interest（ROI） with the size of 30×60 whose center is the point calculated above and to normalize the banked angle of the extracted ROI. After several preprocessing operations such as histogram equalization and binarization, the double-threshold determination method is used to judge whether hands exist or not in single ROI. And then the V-φ graph is drawn according to searching the whole area of the steering wheel in a particular step along the center line of the oval in anti-clockwise direction. Finally, the number of driver’s hands on the steering wheel is got by analyzing the V-φ graph.

Key words: safety driving assistant, steering wheel, operating hands, machine vision