The image edge was obtained by means of Sobel operator and track-ing bug method were compared.

• 研究了柑桔图像的平滑和边缘提取方法；比较了利用Sobel算子和跟踪虫(tracking bug)法所得到的柑桔边缘；发现跟踪虫法寻找边界的速度比用Sobel算子快；且不需要进行细化处理.