Python 结合opencv实现图片截取和拼接

睢宁王健林

实践环境

python 3.6.2
scikit-build-0.16.7
win10
opencv_python-4.5.4.60-cp36-cp36m-win_amd64.whl
下载地址：
https://pypi.org/project/opencv-python/4.5.4.60/#files
https://files.pythonhosted.org/packages/57/6c/7f4f56b2555d5c25dd4f41fc72a16dc6402cb2b4f967da11d8d26c669b55/opencv_python-4.5.4.60-cp36-cp36m-win_amd64.whl
注意：下载时不用下abi版的，比如 opencv_python-4.6.0.66-cp36-abi3-win_amd64.whl 不能用，
因为数据类型为 np.uint8,也就是0~255,
依赖包安装

1. pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple scikit-build # 解决     ModuleNotFoundError: No module named 'skbuild'问题
2. pip install opencv_python-4.5.4.60-cp36-cp36m-win_amd64.whl

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代码实践

示例图片

代码

1. import os
2. import numpy as np
3. import cv2
4. from datetime import datetime
5. from PIL import Image
7. def capture_image(image_file_path, left, upper, width, height, target_file_name=None):
8.     '''截取图片'''
10.     right = left + width
11.     lower = upper + height
12.     if os.path.exists(image_file_path):
13.         image = Image.open(image_file_path)
14.         # width, height = image.size
15.         # print('图片宽度', width, '图片高度', height)
17.         head, ext = os.path.splitext(image_file_path)
18.         if not target_file_name:
19.             target_file_name = 'pic_captured%s%s' % (datetime.now().strftime('%Y%m%d%H%M%S%f'), ext)
21.         target_file_path = '%s%s' % (head, target_file_name)
22.         image.crop((left, upper, right, lower)).save(target_file_path)
23.         return target_file_path
24.     else:
25.         error_msg = '图片文件路径不存在：%s' % image_file_path
26.         print(error_msg)
27.         raise Exception(error_msg)
30. def append_picture(image1_path, image2_path):
31.     '''拼接图片'''
33.     image1 = cv2.imread(image1_path, -1)
34.     shape = image1.shape
35.     height1, width1, channel1 = shape
36.     # print(shape)     # 输出：(315, 510, 4)
37.     # print(image1)    # 输出一3维数组
38.     # print(len(image1), len(image1[0]))  # 输出：315 510
40.     image2 = cv2.imread(image2_path, -1)
41.     height2, width2, channel2 =  image2.shape
43.     total_height = max(height1, height2)
44.     total_width = width1 + width2
46.     dst = np.zeros((total_height, total_width, channel1), np.uint8)
47.     dst[0:height1, 0:width1] = image1
49.     dst[0:height2, width1:total_width] = image2
50.     cv2.imwrite("merge.png", dst)
52. if __name__ == '__main__':
53.     # 截取图片
54.     image_path1 = capture_image('example.png', 10, 30, 510, 315)
55.     image_path2 = capture_image('example.png', 520, 30, 518, 315)
57.     append_picture(image_path1, image_path2)

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运行结果

截取的图片

合并的图片

代码补充说明


来源:https://www.cnblogs.com/shouke/p/17727001.html
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