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https://github.com/TheAlgorithms/Python.git
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129 lines
4.2 KiB
Python
129 lines
4.2 KiB
Python
import glob
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import os
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import random
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from string import ascii_lowercase, digits
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import cv2
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"""
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Flip image and bounding box for computer vision task
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https://paperswithcode.com/method/randomhorizontalflip
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"""
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# Params
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LABEL_DIR = ""
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IMAGE_DIR = ""
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OUTPUT_DIR = ""
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FLIP_TYPE = 1 # (0 is vertical, 1 is horizontal)
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def main() -> None:
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"""
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Get images list and annotations list from input dir.
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Update new images and annotations.
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Save images and annotations in output dir.
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"""
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img_paths, annos = get_dataset(LABEL_DIR, IMAGE_DIR)
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print("Processing...")
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new_images, new_annos, paths = update_image_and_anno(img_paths, annos, FLIP_TYPE)
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for index, image in enumerate(new_images):
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# Get random string code: '7b7ad245cdff75241935e4dd860f3bad'
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letter_code = random_chars(32)
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file_name = paths[index].split(os.sep)[-1].rsplit(".", 1)[0]
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file_root = f"{OUTPUT_DIR}/{file_name}_FLIP_{letter_code}"
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cv2.imwrite(f"{file_root}.jpg", image, [cv2.IMWRITE_JPEG_QUALITY, 85])
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print(f"Success {index+1}/{len(new_images)} with {file_name}")
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annos_list = []
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for anno in new_annos[index]:
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obj = f"{anno[0]} {anno[1]} {anno[2]} {anno[3]} {anno[4]}"
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annos_list.append(obj)
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with open(f"{file_root}.txt", "w") as outfile:
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outfile.write("\n".join(line for line in annos_list))
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def get_dataset(label_dir: str, img_dir: str) -> tuple[list, list]:
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"""
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- label_dir <type: str>: Path to label include annotation of images
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- img_dir <type: str>: Path to folder contain images
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Return <type: list>: List of images path and labels
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"""
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img_paths = []
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labels = []
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for label_file in glob.glob(os.path.join(label_dir, "*.txt")):
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label_name = label_file.split(os.sep)[-1].rsplit(".", 1)[0]
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with open(label_file) as in_file:
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obj_lists = in_file.readlines()
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img_path = os.path.join(img_dir, f"{label_name}.jpg")
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boxes = []
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for obj_list in obj_lists:
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obj = obj_list.rstrip("\n").split(" ")
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boxes.append(
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[
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int(obj[0]),
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float(obj[1]),
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float(obj[2]),
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float(obj[3]),
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float(obj[4]),
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]
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)
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if not boxes:
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continue
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img_paths.append(img_path)
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labels.append(boxes)
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return img_paths, labels
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def update_image_and_anno(
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img_list: list, anno_list: list, flip_type: int = 1
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) -> tuple[list, list, list]:
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"""
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- img_list <type: list>: list of all images
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- anno_list <type: list>: list of all annotations of specific image
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- flip_type <type: int>: 0 is vertical, 1 is horizontal
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Return:
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- new_imgs_list <type: narray>: image after resize
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- new_annos_lists <type: list>: list of new annotation after scale
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- path_list <type: list>: list the name of image file
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"""
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new_annos_lists = []
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path_list = []
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new_imgs_list = []
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for idx in range(len(img_list)):
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new_annos = []
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path = img_list[idx]
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path_list.append(path)
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img_annos = anno_list[idx]
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img = cv2.imread(path)
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if flip_type == 1:
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new_img = cv2.flip(img, flip_type)
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for bbox in img_annos:
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x_center_new = 1 - bbox[1]
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new_annos.append([bbox[0], x_center_new, bbox[2], bbox[3], bbox[4]])
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elif flip_type == 0:
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new_img = cv2.flip(img, flip_type)
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for bbox in img_annos:
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y_center_new = 1 - bbox[2]
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new_annos.append([bbox[0], bbox[1], y_center_new, bbox[3], bbox[4]])
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new_annos_lists.append(new_annos)
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new_imgs_list.append(new_img)
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return new_imgs_list, new_annos_lists, path_list
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def random_chars(number_char: int = 32) -> str:
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"""
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Automatic generate random 32 characters.
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Get random string code: '7b7ad245cdff75241935e4dd860f3bad'
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>>> len(random_chars(32))
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32
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"""
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assert number_char > 1, "The number of character should greater than 1"
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letter_code = ascii_lowercase + digits
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return "".join(random.choice(letter_code) for _ in range(number_char))
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if __name__ == "__main__":
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main()
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print("DONE ✅")
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