【摘要】 图像边缘是一种重要的视觉信息,是图像最基本的特征之一。所谓边缘是指图像中周围象素灰度有阶跃变化或屋顶变化的那些象素的集合。首先介绍和分析了常规的边缘检测算法,包括基于梯度的边缘检测和检测二阶导数的零交叉点,同时进一步介绍了基于小波变换的多尺度边缘检测,同时分析了该方法的性能和特点。更多还原

【Abstract】 The edge detection is one of the fundamental topics in the image analyses and the computer vision.The point of singular signal’s conjoint pixel always change acutely in its gray-level value.This paper introduces traditional methods,including: edge detection based on gradient and zero crossing of differential coefficient.Furthermore the thesis introduces method based on wavelet and its multi-scale characteristic.更多还原