做图像处理需要大批量的修改图片尺寸来做训练样本，为此本程序借助opencv来实现大批量的剪切图片。
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import cv2
import os
def cutimage(dir,suffix):
for root,dirs,files in os.walk(dir):
for file in files:
filepath = os.path.join(root, file)
filesuffix = os.path.splitext(filepath)[1][1:]
if filesuffix in suffix: #遍历找到指定后缀的文件名["jpg",png]等
image = cv2.imread(file) #opencv剪切图片
#cv2.imshow(file,image)
dim =(242,200) #指定尺寸w*h
resized =cv2.resize(image,dim,interpolation = cv2.INTER_AREA) #这里采用的插值法是INTER_LINEAR
#cv2.imshow("resize:%s"%file,resized)
cv2.imwrite("../cv/%s"%file,resized) #保存文件
cv2.waitKey(0) #退出
suffix = ["jpg"]
dir = '.'
cutimage(dir,suffix)
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