基于视差图的未知环境下农田障碍物检测方法  

Obstacle detection for farmland in unknown environment based on disparity image

作　　者：苟琴[1] 耿楠[1] 张志毅[1] 

机构地区：[1]西北农林科技大学信息工程学院,陕西杨凌712100

出　　处：《计算机工程与设计》2013年第2期707-710,共4页Computer Engineering and Design

基　　金：国家自然科学基金项目(61003151)

摘　　要：针对智能农业机器人作业环境中障碍物不规则和背景受自然光照等外界环境干扰大的问题,提出一种基于视差图的未知环境下障碍物检测方法。采用价格低廉的网络摄像头采集左右场景图并计算对应的视差图;用视差阈值过滤掉远处的景物,再通过区域连通,得到独立的潜在障碍物;最终经面积阈值和高度阈值的过滤,检测出障碍物并定位。实验结果表明,该检测算法不需要障碍物和背景的先验知识,在距离摄像头5m视野内,障碍物距离和尺寸测量的相对偏差绝对值分别控制在4.37%和3.81%以内。Considering the irregularity of obstacles as well as the variability of background in intelligent agricultural robot wor king environment, a disparitybased method for obstacle detection in unknown environment is proposed. Two inexpensive web cams are adopted to capture left and right images, based on which the initial disparity image is calculated. Subsequently, the re mote scene is filtered by a disparity threshold, and then potential obstacles are obtained from the disparity image through region connection. The method is finalized by the recognition and location of obstacles via the filtration of area and height threshold. Experimental results indicate that the presented algorithm could bypass the prior information of obstacles and background In the distance of 5m from the camera, the absolute error percent of the calculated distance is limited below 4. 37%, with that of the calculated size within 3. 81%.

关 键 词：智能农业机器人 未知环境 障碍物检测视 视差图 区域连通 

分 类 号：TP242.62[自动化与计算机技术—检测技术与自动化装置]