用matlab进行图像检索，基于边缘直方图（EHD）描述子，它是MPEG-7标准中提出的一种边缘描述子，它具有描述图像亮度变化的方向和频率的能力。资料为主程序代码。-Matlab for image retrieval, based on the descr iption of the edge histogram (EHD) sub, it is proposed in the MPEG-7 standard descr iptor an edge, it has the direction