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Bulk image downloader from a list of urls

Project description

imgdl

Python package for downloading a collection of images from a list of urls. It comes with the following features:

  • Downloads are multithreaded using concurrent.futures.
  • Relies on a persistent cache. Already downloaded images are not downloaded again, unless you force imgdl to do so.
  • Can hide requests behind proxies
  • It can be used as a command line utility or as a python library.
  • Normalizes images to JPG format + RGB mode after download.
  • Generates thumbnails of varying sizes automatically.
  • Can space downloads with a random timeout drawn from an uniform distribution.

Installation

pip install imgdl

Or, from the root project directory:

pip install .

Usage

Here is a simple example using the default configurations:

from imgdl import download

urls = [
    'https://upload.wikimedia.org/wikipedia/commons/9/92/Moh_%283%29.jpg',
    'https://upload.wikimedia.org/wikipedia/commons/8/8b/Moh_%284%29.jpg',
    'https://upload.wikimedia.org/wikipedia/commons/c/cd/Rostige_T%C3%BCr_P4RM1492.jpg'
]

paths = download(urls, store_path='~/.datasets/images', n_workers=50)

100%|███████████████████████████████████| 3/3 [00:08<00:00,  2.68s/it]

Images will be downloaded to ~/.datasets/images using 50 threads. The function returns the list of paths to each image. Paths are constructed as {store_data}/{SHA1-hash(url).jpg}. If for any reason a download fails, imgdl returns a None as path.

Notice that if you invoke download again with the same urls, it will not download them again as it will check first that they are already downloaded.

paths = download(urls, store_path='~/.datasets/images', n_workers=50)

100%|████████████████████████████████| 3/3 [00:00<00:00, 24576.00it/s]

Download was instantaneous! and imgdl is clever enough to return the image paths.

Here is the complete list of parameters taken by download:

  • iterator: The only mandatory parameter. Usually a list of urls, but can be any kind of iterator.
  • store_path: Root path where images should be stored
  • n_workers: Number of simultaneous threads to use
  • timeout: Timeout that the url request should tolerate
  • thumbs: If True, create thumbnails of sizes according to thumbs_size
  • thumbs_size: Dictionary of the kind {name: (width, height)} indicating the thumbnail sizes to be created.
  • min_wait: Minimum wait time between image downloads
  • max_wait: Maximum wait time between image downloads
  • proxies: Proxy or list of proxies to use for the requests
  • headers: headers to be given to requests
  • user_agent: User agent to be used for the requests
  • notebook: If True, use the notebook version of tqdm progress bar
  • debug If True, imgdl logs urls that could not be downloaded
  • force: download checks first if the image already exists on store_path in order to avoid double downloads. If you want to force downloads, set this to True.

Most of these parameters can also be set on a config.yaml file found on the directory where the Python process was launched. See config.yaml.example

Command Line Interface

It can also be used as a command line utility:

$ imgdl --help
usage: imgdl [-h] [-o STORE_PATH] [--thumbs THUMBS] [--n_workers N_WORKERS]
             [--timeout TIMEOUT] [--min_wait MIN_WAIT] [--max_wait MAX_WAIT]
             [--proxy PROXY] [-u USER_AGENT] [-f] [--notebook] [-d]
             urls

Bulk image downloader from a list of urls

positional arguments:
  urls                  Text file with the list of urls to be downloaded

optional arguments:
  -h, --help            show this help message and exit
  -o STORE_PATH, --store_path STORE_PATH
                        Root path where images should be stored (default:
                        ~/.datasets/imgdl)
  --thumbs THUMBS       Thumbnail size to be created. Can be specified as many
                        times as thumbs sizes you want (default: None)
  --n_workers N_WORKERS
                        Number of simultaneous threads to use (default: 50)
  --timeout TIMEOUT     Timeout to be given to the url request (default: 5.0)
  --min_wait MIN_WAIT   Minimum wait time between image downloads (default:
                        0.0)
  --max_wait MAX_WAIT   Maximum wait time between image downloads (default:
                        0.0)
  --proxy PROXY         Proxy or list of proxies to use for the requests
                        (default: None)
  -u USER_AGENT, --user_agent USER_AGENT
                        User agent to be used for the requests (default:
                        Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0)
                        Gecko/20100101 Firefox/55.0)
  -f, --force           Force the download even if the files already exists
                        (default: False)
  --notebook            Use the notebook version of tqdm (default: False)
  -d, --debug           Activate debug mode (default: False)

Download images from google

This is an example of how we can use imgdl to download images from a google image search. I currently use this to quickly build up image datasets. I took inspiration from this blog post by pyimagesearch.

Requirements

Install imgdl with the [google] extra requirements:

pip install imgdl[google]

Download the webdriver for Chrome here and make sure it’s in your PATH, e. g., place it in /usr/bin or /usr/local/bin.

sudo cp chromedriver /usr/local/bin/

Clone this repository, or simply download the google.py script.

Usage

You are ready to download images from a google images search. Here is an example of usage:

$ python google.py "paris by night" -n 600 --interactive
Querying google images for 'paris by night'
Scrolling down five times
600 images found.
Downloading to /Users/aguirre/Projets/imagedownloader/examples/images
100%|█████████████████████████████| 600/600 [01:15<00:00,  7.91it/s]
2018-03-04 23:21:52,616 - imgdl.downloader - INFO - 0 images failed to download

The first argument is the query to be sent to google. With -n 600 you are asking for at least 600 images. By default, a google image query page has only 100 images and requires you to scroll down if you want more. What the script is doing is using selenium to simulate a browsing session and scroll down on google search. With the --interactive flag, chrome will open and you will be able to see how it scrolls down in order to get more images. Here is the full list of the command line options:

$ python google.py --help
usage: google.py [-h] [-n N_IMAGES] [--interactive] [-o STORE_PATH]
                 [--thumbs THUMBS] [--n_workers N_WORKERS] [--timeout TIMEOUT]
                 [--min_wait MIN_WAIT] [--max_wait MAX_WAIT] [--proxy PROXY]
                 [-u USER_AGENT] [-f] [--notebook] [-d]
                 query

Download images from a google images query

positional arguments:
  query                 Query string to be executed on google images

optional arguments:
  -h, --help            show this help message and exit
  -n N_IMAGES, --n_images N_IMAGES
                        Number of expected images to download (default: 100)
  --interactive         Open up chrome interactively to see the search results
                        and scrolling action. (default: False)
  -o STORE_PATH, --store_path STORE_PATH
                        Root path where images should be stored (default:
                        images)
  --thumbs THUMBS       Thumbnail size to be created. Can be specified as many
                        times as thumbs sizes you want (default: None)
  --n_workers N_WORKERS
                        Number of simultaneous threads to use (default: 40)
  --timeout TIMEOUT     Timeout to be given to the url request (default: 5.0)
  --min_wait MIN_WAIT   Minimum wait time between image downloads (default:
                        0.0)
  --max_wait MAX_WAIT   Maximum wait time between image downloads (default:
                        0.0)
  --proxy PROXY         Proxy or list of proxies to use for the requests
                        (default: None)
  -u USER_AGENT, --user_agent USER_AGENT
                        User agent to be used for the requests (default:
                        Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0)
                        Gecko/20100101 Firefox/55.0)
  -f, --force           Force the download even if the files already exists
                        (default: False)
  --notebook            Use the notebook version of tqdm (default: False)
  -d, --debug           Activate debug mode (default: False)

Acknowledgements

Images used for tests are from the wikimedia commons

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