在opencv python中使用级联分类器进行人脸检测 [英] Face detection using Cascade Classifier in opencv python

问题描述

我正在使用内置的级联分类器进行人脸检测.这就是代码的样子(OpenCV Python 教程):

I am using the inbuilt cascade classifier for the face detection. This is how the code is (OpenCV Python Tutorials):

import numpy as np
import cv2

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')

img = cv2.imread('ammma.jpg')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

faces = face_cascade.detectMultiScale(gray, 1.3, 5)

for (x,y,w,h) in faces:
    cv2.Rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
    roi_gray = gray[y:y+h, x:x+w]
    roi_color = img[y:y+h, x:x+w]
    eyes = eye_cascade.detectMultiScale(roi_gray)
    for(ex,ey,ew,eh) in eyes:
        cv2.Rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)

cv2.imshow('img',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

但是当我运行代码时出现以下错误:

But when I run the code I am getting the following error:

C:Python27python.exe C:/Users/DELL/Downloads/Amma/code/fd.py

C:Python27python.exe C:/Users/DELL/Downloads/Amma/code/fd.py

OpenCV 错误: cv::CascadeClassifier::detectMultiScale 中的断言失败 (!empty())，文件 C:uildsmaster_PackSlaveAddon-win32-vc12-staticopencvmodulesobjdetectsrccascadedetect.cpp，行1634回溯(最近一次通话最后):文件C:/Users/DELL/Downloads/Amma/code/fd.py"，第 10 行，在faces = face_cascade.detectMultiScale(img, 1.3, 5)cv2.error: C:uildsmaster_PackSlaveAddon-win32-vc12-staticopencvmodulesobjdetectsrccascadedetect.cpp:1634: 错误: (-215) !empty() in function cv::CascadeClassifier::detectMultiScale

OpenCV Error: Assertion failed (!empty()) in cv::CascadeClassifier::detectMultiScale, file C:uildsmaster_PackSlaveAddon-win32-vc12-staticopencvmodulesobjdetectsrccascadedetect.cpp, line 1634 Traceback (most recent call last): File "C:/Users/DELL/Downloads/Amma/code/fd.py", line 10, in faces = face_cascade.detectMultiScale(img, 1.3, 5) cv2.error: C:uildsmaster_PackSlaveAddon-win32-vc12-staticopencvmodulesobjdetectsrccascadedetect.cpp:1634: error: (-215) !empty() in function cv::CascadeClassifier::detectMultiScale

推荐答案

参考这行代码，检查级联是否为非空失败.请使用经过训练的级联检查 XML 文件的路径.您可能需要像这样指定 XML 的完整路径:

Refer to this line of code, it failed on checking that cascade is non empty. Please check path to XML files with trained cascades. You may need to specify full path to XML's like this:

face_cascade = cv2.CascadeClassifier('D:opencvdatahaarcascadeshaarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('D:opencvdatahaarcascadeshaarcascade_eye.xml')

或者只是把这些文件放到包含你的脚本的目录中.

Or just put this files to directory containig your script.

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