如何将数据集的图像列表保存（写入）到新文件夹-openCV Python？

Question

I'm so much newbie in openCV/Python tasks. I use Python 3.7 and openCV 4 running by a JNotebook. The question: I wanna save just 1,000 images from a dataset with 10,000 pictures, extracting them from it and write only those 1,000.jpeg in a new folder, is it possible using openCV package in Python? I've already had a list of names (1,000 images).

Answer 1

If you need just to copy files, you even don't need OpenCV tools:

out_folder_path = '...'
in_folder_path = '...'
images_to_save_names = [...]
for image_name in images_to_save_names:
    cur_image_path = os.path.join(in_folder_path, image_name)
    cur_image_out_path = os.path.join(out_folder_path, image_name)
    shutil.copyfile(cur_image_path, cur_image_out_path)

If you have image names and their binary data from some specific DS file(.csv, .hdf, etc), you can use cv2.imwrite(path, image) instead of copying.

Answer 2

假设您已在计算机上正确安装了OpenCV，则可以首先使用img = cv.imread(filename)读取图像，然后使用cv.imwrite(filename, img)写入cv.imwrite(filename, img) 。