0.引言
自己在下载dlib官网给的example代码时,一开始不知道怎么使用,在一番摸索之后弄明白怎么使用了;
现分享下 face_detector.py 和 face_landmark_detection.py 这两个py的使用方法;
1.简介
python: 3.6.3
dlib: 19.7
利用dlib的特征提取器,进行人脸 矩形框 的特征提取:
利用dlib的68点特征预测器,进行人脸 68点 特征提取:
效果:
(a) face_detector.py (b) face_landmark_detection.py
2.py文件功能介绍
face_detector.py : 识别出图片文件中一张或多张人脸,并用矩形框框出标识出人脸;
link: http://dlib.net/cnn_face_detector.py.html
face_landmark_detection.py : 在face_detector.py的识别人脸基础上,识别出人脸部的具体特征部位:下巴轮廓、眉毛、眼睛、嘴巴,同样用标记标识出面部特征;
link: http://dlib.net/face_landmark_detection.py.html
2.1. face_detector.py
官网给的face_detector.py
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]))
为了方便理解,修改增加注释之后的 face_detector.py
import dlib
from skimage import io
# 使用特征提取器frontal_face_detector
detector = dlib.get_frontal_face_detector()
# path是图片所在路径
path = "F:/code/python/P_dlib_face/pic/"
img = io.imread(path+"1.jpg")
# 特征提取器的实例化
dets = detector(img)
print("人脸数:", len(dets))
# 输出人脸矩形的四个坐标点
for i, d in enumerate(dets):
print("第", i, "个人脸d的坐标:",
"left:", d.left(),
"right:", d.right(),
"top:", d.top(),
"bottom:", d.bottom())
# 绘制图片
win = dlib.image_window()
# 清除覆盖
#win.clear_overlay()
win.set_image(img)
# 将生成的矩阵覆盖上
win.add_overlay(dets)
# 保持图像
dlib.hit_enter_to_continue()
对test.jpg进行人脸检测:
结果:
图片窗口结果:
输出结果:
对于多个人脸的检测结果:
2.2 face_landmark_detection.py
官网给的 face_detector.py
#!/usr/bin/python
# The contents of this file are in t