Python OpenCV crop and save images

Problem Description

Select a region from the picture, Entersave

1.jpg

Code

# -*- coding: utf-8 -*-
# @Author  : XerCis
# @Time    : 2020/3/18 20:00
# @Function: 从图片中选出某一区域，Enter保存

import cv2

# 读取图片
img = '1.jpg'
img = cv2.imread(img)
cv2.imshow('original', img)

# 选择ROI
roi = cv2.selectROI(windowName="original", img=img, showCrosshair=True, fromCenter=False)
x, y, w, h = roi
print(roi)

# 显示ROI并保存图片
if roi != (0, 0, 0, 0):
    crop = img[y:y+h, x:x+w]
    cv2.imshow('crop', crop)
    cv2.imwrite('crop.jpg', crop)
    print('Saved!')

# 退出
cv2.waitKey(0)
cv2.destroyAllWindows()

PS: x, ycoordinates the ROI w, his the size of ROI

effect

Percussion Enter

get the picturecrop.jpg

Remark

1. OpenCV coordinate system origin in the upper left corner