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

问题描述

我正在使用内置的层叠分类器进行人脸检测. 代码就是这样的( 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:\ Python27 \ python.exe C:/Users/DELL/Downloads/Amma/code/fd.py

C:\Python27\python.exe C:/Users/DELL/Downloads/Amma/code/fd.py

OpenCV错误:cv :: CascadeClassifier :: detectMultiScale，文件C:\ builds \ master_PackSlaveAddon-win32-vc12-static \ opencv \ modules \ objdetect \ src \ cascadedetect.cpp，行中的断言失败(！empty()) 1634 追溯(最近一次通话): 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:\ builds \ master_PackSlaveAddon-win32-vc12-static \ opencv \ modules \ objdetect \ src \ cascadedetect.cpp:1634:error:(-215)！empty()in function cv :: CascadeClassifier :: detectMultiScale

OpenCV Error: Assertion failed (!empty()) in cv::CascadeClassifier::detectMultiScale, file C:\builds\master_PackSlaveAddon-win32-vc12-static\opencv\modules\objdetect\src\cascadedetect.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:\builds\master_PackSlaveAddon-win32-vc12-static\opencv\modules\objdetect\src\cascadedetect.cpp:1634: error: (-215) !empty() in function cv::CascadeClassifier::detectMultiScale

推荐答案

请参阅

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:\opencv\data\haarcascades\haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('D:\opencv\data\haarcascades\haarcascade_eye.xml')

或者只是将此文件放到脚本所在的目录中.

Or just put this files to directory containig your script.

这篇关于在OpenCV Python中使用Cascade分类器进行人脸检测的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！