Where can I find haar cascades xml files?

user_1401950 0
Viewed 128169

I'm looking for a website to download haar cascades xml files from. It can be for any objects as long as its a properly working cascade.

opencv
10 Answers

If you're using opencv from python, you can use this code snippet to use the built-in haar cascades:

import os
import cv2

cv2_base_dir = os.path.dirname(os.path.abspath(cv2.__file__))
haar_model = os.path.join(cv2_base_dir, 'data/haarcascade_frontalface_default.xml')
user_3030560

The xml files can be accessed directly from cv2 like so

cv2.data.haarcascades

heres a more detialed example

face_cascade_name = cv2.data.haarcascades + 'haarcascade_frontalface_alt.xml'
face_cascade = cv2.CascadeClassifier()
if not face_cascade.load(cv2.samples.findFile(face_cascade_name)):
    print("Error loading xml file")
    exit(0)
user_70436880

You don't need to go to other websites to find the cascade classifier files. you just need to go to the opencv releases site. There download the appropriate release. then open the downloaded file. In there direct as followed : sources > data > haarcascades ; In that file you should find the all default haarcascade files.

user_97800470
user_114608040

This is how I do it with git v2.25.0, also tested with v2.26.2. This trick doesn't work with v2.30.1

TLDR

git clone --no-checkout --filter=tree:0 https://github.com/opencv/opencv
cd opencv

# requires git 2.25.x to 2.26.2
git sparse-checkout set data/haarcascades

You can use Docker to avoid installing a specific version of git

git clone --no-checkout --filter=tree:0 https://github.com/opencv/opencv
cd opencv

# requires git 2.25.x to 2.26.2
docker run --rm -it -v $PWD/:/code/ --workdir=/code/ alpine/git:v2.26.2 sparse-checkout set data/haarcascades

Full solution

# bare minimum clone of opencv
$ git clone --no-checkout --filter=tree:0 https://github.com/opencv/opencv
...
Resolving deltas: 100% (529/529), done.

# Downloaded only ~7.3MB , takes ~3 seconds
# du = disk usage, -s = summary, -h = human-readable
$ du -sh opencv
7.3M    opencv/

# Set target dir
$ cd opencv
$ git sparse-checkout set data/haarcascades
...
Updating files: 100% (17/17), done.
# Takes ~10 seconds, depending on your specs

# View downloaded files
$ du -sh data/haarcascades/
9.4M    data/haarcascades/
$ ls data/haarcascades/
haarcascade_eye.xml                      haarcascade_frontalface_alt2.xml      haarcascade_licence_plate_rus_16stages.xml  haarcascade_smile.xml
haarcascade_eye_tree_eyeglasses.xml      haarcascade_frontalface_alt_tree.xml  haarcascade_lowerbody.xml                   haarcascade_upperbody.xml
haarcascade_frontalcatface.xml           haarcascade_frontalface_default.xml   haarcascade_profileface.xml
haarcascade_frontalcatface_extended.xml  haarcascade_fullbody.xml              haarcascade_righteye_2splits.xml
haarcascade_frontalface_alt.xml          haarcascade_lefteye_2splits.xml       haarcascade_russian_plate_number.xml

References

user_52857320
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