pil example rescale labeled images (snippet)

Python pil example 'rescale labeled images'

Functions in program:

def main(argv):
def parseArgs(args):
def rescale_labeled_images(path, destination, size):
def create_dir(directory):

Modules used in program:

import xml.etree.ElementTree as ET
import sys
import glob
import os

python rescale labeled images

Python pil example: rescale labeled images

import os
import glob
import sys
import xml.etree.ElementTree as ET
from PIL import Image

# Get the Current Dir
root = os.getcwd()

def create_dir(directory):
    '''
    Create a new dir, if not already exists
    '''
    if not os.path.exists(directory):
        os.makedirs(directory)

def rescale_labeled_images(path, destination, size):

    global root

    # Create the destination directory
    create_dir(os.path.join(root, destination))

    # Get the destination size
    dest_width, dest_height = size

    for xml_file in glob.glob(path + '/*.xml'):
        tree = ET.parse(xml_file)
        root = tree.getroot()

        # Get the image file first
        image_name = root.find('filename').text
        image_path = os.path.join(path, image_name)

        # Resize Image
        pil_image = Image.open(open(image_path, 'rb'))
        pil_image_resize = pil_image.resize(size)
        pil_image_resize.save(os.path.join(destination, image_name))

        width, height = pil_image.size

        width_scale = dest_width / width
        height_scale = dest_height / height

        # Update XML
        #################

        # Change the size part
        size_part = root.find('size')
        for child in size_part:
            if child.tag == 'width':
                child.text = str(dest_width)
            elif child.tag == 'height':
                child.text = str(dest_height)

        # Update the Box for each object
        for member in root.findall('object'):
            for child in member:
                if child.tag == 'bndbox':
                    for point in child:
                        value = int(point.text)
                        if point.tag[0] == 'x':
                            value = int(value * width_scale)
                        else:
                            value = int(value * height_scale)
                        point.text = str(value)

        # Build the new file name
        xml_file_name = xml_file.replace(path, '')
        xml_file_name = xml_file_name.replace('\\', '')
        tree.write(os.path.join(destination, xml_file_name))

def parseArgs(args):

    # Possible arguments
    input_dir = None
    output_dir = None
    img_size = None

    i = 1
    while  i < len(args):
        if args[i] == '-i':
            input_dir = args[i+1]
            i += 2
        elif args[i] == '-o':
            output_dir = args[i+1]
            i += 2
        elif args[i] == '-s':
            img_size = (int(args[i+1]),int(args[i+2]))
            i += 3

    return input_dir, output_dir, img_size

def main(argv):
    input_dir, output_dir, img_size = parseArgs(argv)
    rescale_labeled_images(input_dir, output_dir, img_size)
    pass

if __name__ == "__main__":
    main(sys.argv)

Python links

Learn Python: https://pythonbasics.org/
Python Tutorial: https://pythonprogramminglanguage.com