Python opencv应用实现图片切分操作示例

import cv2 # Should be install independently.

img1 = cv2.imread(filename)

    # shape[0]:height shape[1]:width shape[2]:channel
    # img[y0:y1, x0:x1] 0=(left up) 1=(right low)
    slice1 = img[0:height, width/2:width]

    cv2.imwrite(getname(index1), slice1, [int(cv2.IMWRITE_PNG_COMPRESSioN), 1])

    img = cv2.resize(img1, (0, 0), fx=compressratio, fy=compressratio, interpolation=cv2.INTER_NEAREST)

#!/usr/bin/env python
# ---------------------------------------------------------------------------------
# coding=utf-8
# @File    : sliceImage.py
# @Author  : Jiangwei
# @Date    : 2020/4/18
# @Desc    : Slice images.
# @History :
#     Date       Author      Description
#   20200418    Jiangwei     Created.
# @Warning:
#   Tested in Python 2.7.
# ---------------------------------------------------------------------------------
import os
import sys
import cv2  # Should be install independently.
todir = "tmp"
exts  = ['.jpg', '.JPG', '.png', '.PNG']
compressratio = 0.75
def listimage(adir):
    '''
    adir    : The directory name.
    '''
    list = []
    for i in os.listdir(adir):
        if os.path.splitext(i)[1] in exts:
            list.append(os.path.join(adir, i))
    return list
def getname(index):
    page = "Image%03D.png" % index
    return os.getcwd() + "\\" + todir + "\\" + page
def doslice(filename, index1, index2):
    img1 = cv2.imread(filename)
    img = cv2.resize(img1, (0, 0), fx=compressratio, fy=compressratio, interpolation=cv2.INTER_NEAREST)
    height,width = img.shape[0:2]
    # shape[0]:height shape[1]:width shape[2]:channel
    # img[y0:y1, x0:x1] 0=(left up) 1=(right low)
    slice1 = img[0:height, width/2:width]
    cv2.imwrite(getname(index1), slice1, [int(cv2.IMWRITE_PNG_COMPRESSION), 1])
    print getname(index1)
    slice2 = img[0:height, 0:width/2]
    cv2.imwrite(getname(index2), slice2, [int(cv2.IMWRITE_PNG_COMPRESSION), 1])
    print getname(index2)
    return
if __name__ == "__main__":
    '''
    Slice images.
    '''
    # Temperature directory for sliceped images.
    if not os.path.exists(todir):
        os.mkdir(todir)
    # Transverse all files and do the slice.
    imagelist = listimage (os.getcwd())
    index = 1
    for i in imagelist:
        print "Processing %s" % i
        doslice(i, index, index + 1)
        index += 2