Python+OpenCVで顔検出

インストール

少し面倒なので、以下あたりを参考に

Install OpenCV 3.0 and Python 2.7+ on Ubuntu

Install OpenCV 3.0 and Python 2.7+ on OSX

MacでOpenCVとpythonを使う

Python 環境のインストール

コード

分類器のある場所は環境に合わせて変更
which python
とか
which python3
でpythonの場所を調べたら、インストールされていればその周辺にあるのではないかと

detect_face.py

# -*- coding: utf-8 -*-

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import cv2, os, sys, imghdr, shutil

CLASSIFIERS = (
    'haarcascade_frontalcatface_extended.xml',
    'haarcascade_frontalcatface.xml',
    'haarcascade_frontalface_alt_tree.xml',
    'haarcascade_frontalface_alt.xml',
    'haarcascade_frontalface_alt2.xml',
    'haarcascade_frontalface_default.xml',
)
PATH_CLASSIFIER = '{python_dir}/{classifier_dir}/{classifier}'.format(
    python_dir = os.path.split(sys.executable)[0],
    classifier_dir = '../share/OpenCV/haarcascades',
    classifier = CLASSIFIERS[4]
)
CWD = os.getcwd()
DIR_ORIGIN = CWD + '/images/'
DIR_DONE = CWD + '/done/'
DIR_NONE = CWD + '/none/'
DIR_DESTINATION = CWD + '/faces/'

classifier = cv2.CascadeClassifier(PATH_CLASSIFIER)

def mkdir(path):
    dirs = path.split('/')
    current = ''
    for d in dirs:
        current += d + '/'
        if not os.path.exists(current):
            os.mkdir(current)

def moveFile(origin_path, dest_dir):
    mkdir(dest_dir)
    shutil.move(origin_path, dest_dir)

def getFaces(path_full):
    image = cv2.imread(path_full)
    gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    faces = classifier.detectMultiScale(gray)
    path, name = os.path.split(path_full)
    path_destination = path.replace(DIR_ORIGIN, DIR_DESTINATION)
    dir_done = path.replace(DIR_ORIGIN, DIR_DONE)
    dir_none = path.replace(DIR_ORIGIN, DIR_NONE)
    base_name = os.path.join(path_destination, name[:name.rfind('.')])
    count = len(faces)
    for i in range(count):
        x, y , w, h = faces[i]
        crop = image[y : y + h, x : x + w]
        file_name = base_name
        file_name += ('_' + str(i + 1)) if count > 1 else ''
        file_name += '.jpg'
        mkdir(path_destination)
        cv2.imwrite(file_name, crop, [cv2.IMWRITE_JPEG_QUALITY, 100])
    if count:
        moveFile(path_full, dir_done)
    else:
        moveFile(path_full, dir_none)
    return count

def isEmpty(dir_):
    return True if not os.listdir(dir_) else False

count = 0
for path, subdirs, files in os.walk(DIR_ORIGIN):
    for name in files:
        path_full = os.path.join(path, name)
        if imghdr.what(path_full) in ['jpeg']:
            count = getFaces(path_full)
    if count:
        if isEmpty(path):
            os.rmdir(path)
        count = 0