从图片文件夹中抽取固定张数的图片

 在相机标定过程中需要在众多图片中挑选固定张数的图片，此时可以使用python脚本进行筛选

import os
from shutil import copy 

def abstract(source_path,to_path,interval=200):
    files = os.listdir(source_path) 
    num_png = len(files)    
    n=int(num_png/interval)  
    for file in files: 
        for i in range(0,num_png,n):
            if file=='%06d' % i+'.png':
                source_file = os.path.join(source_path, file) 
                print(source_file)
                to_file = os.path.join(to_path, file)
                if not os.path.exists(to_path):
                    os.makedirs(to_path)
                copy(source_file, to_file)  

if __name__ == '__main__':		
    source_path1='/home/luoyh/Desktop/intrinsic/cam_back'
    source_path2='/home/luoyh/Desktop/intrinsic/cam_front_center'
    source_path3='/home/luoyh/Desktop/intrinsic/cam_front_right'
    source_path4='/home/luoyh/Desktop/intrinsic/cam_left_back'
    source_path5='/home/luoyh/Desktop/intrinsic/cam_right_front'

    to_path1 = "./cam_back"
    to_path2 = "./cam_front_center"
    to_path3 = "./cam_front_right"
    to_path4 = "./cam_left_back"
    to_path5 = "./cam_right_front"

    abstract(source_path1,to_path1)
    abstract(source_path2,to_path2,150)
    abstract(source_path3,to_path3)
    abstract(source_path4,to_path4)
    abstract(source_path5,to_path5)