非法的

To solve this problem, an algorithm which can adaptively determine the double thresholds based on gradient histogram and minimum interclass variance and improve Canny operator was proposed. Theory and experiments show that the proposed algorithm is effective and correct.

为了对Canny算子的这一缺陷加以改进，提出了基于梯度幅度直方图和类内方差最小化原理自适应地求取双阈值的算法对大津法作出改进，理论推导和实验结果证明了该算法的正确性和有效性。

Philomachus pugnax belongs to Scolopacidae of Charadriiformes, it breeds in northern Eurasia, westwards to Britain, Norway and Sweden, northwards to Chukotskiy Peninsula, northeast of Siberia, southwards to Germany, Netherlands, Gilgis Plain of Central Asia and Altai, and winters in Africa, Southeast Asia and Australia.

流苏鹬属鸻形目鹬科。繁殖于欧亚大陆北部，西至英国、挪威、瑞典，往北到西伯利亚东北角的楚科奇半岛，南至德国、荷兰、中亚吉尔吉斯平原和阿尔泰山。越冬于非洲、东南亚和澳大利亚。