Caltech-256数据库比Caltech-101每一类别下的图片数目多出四十几张，类别数目多出一倍，总图片数多出两万张之多(the image numbles of Caltech-256 database under the same object category is more than that in Caltech-101,and the numbles of category is more than twice,total images numble is 30607)