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+#!/usr/bin/python
+# The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
+#
+# This example program shows how to find frontal human faces in an image. In
+# particular, it shows how you can take a list of images from the command
+# line and display each on the screen with red boxes overlaid on each human
+# face.
+#
+# The examples/faces folder contains some jpg images of people. You can run
+# this program on them and see the detections by executing the
+# following command:
+# ./face_detector.py ../examples/faces/*.jpg
+#
+# This face detector is made using the now classic Histogram of Oriented
+# Gradients (HOG) feature combined with a linear classifier, an image
+# pyramid, and sliding window detection scheme. This type of object detector
+# is fairly general and capable of detecting many types of semi-rigid objects
+# in addition to human faces. Therefore, if you are interested in making
+# your own object detectors then read the train_object_detector.py example
+# program.
+#
+#
+# COMPILING/INSTALLING THE DLIB PYTHON INTERFACE
+# You can install dlib using the command:
+# pip install dlib
+#
+# Alternatively, if you want to compile dlib yourself then go into the dlib
+# root folder and run:
+# python setup.py install
+# or
+# python setup.py install --yes USE_AVX_INSTRUCTIONS
+# if you have a CPU that supports AVX instructions, since this makes some
+# things run faster.
+#
+# Compiling dlib should work on any operating system so long as you have
+# CMake installed. On Ubuntu, this can be done easily by running the
+# command:
+# sudo apt-get install cmake
+#
+# Also note that this example requires scikit-image which can be installed
+# via the command:
+# pip install scikit-image
+# Or downloaded from http://scikit-image.org/download.html.
+
+import sys
+
+import dlib
+from skimage import io
+
+
+detector = dlib.get_frontal_face_detector()
+win = dlib.image_window()
+
+for f in sys.argv[1:]:
+ print("Processing file: {}".format(f))
+ img = io.imread(f)
+ # The 1 in the second argument indicates that we should upsample the image
+ # 1 time. This will make everything bigger and allow us to detect more
+ # faces.
+ dets = detector(img, 1)
+ print("Number of faces detected: {}".format(len(dets)))
+ for i, d in enumerate(dets):
+ print("Detection {}: Left: {} Top: {} Right: {} Bottom: {}".format(
+ i, d.left(), d.top(), d.right(), d.bottom()))
+
+ win.clear_overlay()
+ win.set_image(img)
+ win.add_overlay(dets)
+ dlib.hit_enter_to_continue()
+
+
+# Finally, if you really want to you can ask the detector to tell you the score
+# for each detection. The score is bigger for more confident detections.
+# The third argument to run is an optional adjustment to the detection threshold,
+# where a negative value will return more detections and a positive value fewer.
+# Also, the idx tells you which of the face sub-detectors matched. This can be
+# used to broadly identify faces in different orientations.
+if (len(sys.argv[1:]) > 0):
+ img = io.imread(sys.argv[1])
+ dets, scores, idx = detector.run(img, 1, -1)
+ for i, d in enumerate(dets):
+ print("Detection {}, score: {}, face_type:{}".format(
+ d, scores[i], idx[i]))
+