[英]Python face detection error with opencv
I try to use python face detection software. 我尝试使用python人脸检测软件。 But when I launch it i recive this error:
但是当我启动它时,我会收到这个错误:
OpenCV Error: Unspecified error (The node does not represent a user object (unknown type?)) in cvRead, file /build/opencv-FWWjHr/opencv-2.4.9.1+dfsg/modules/core/src/persistence.cpp, line 4991
Traceback (most recent call last):
File "riconoscimentofacciale.py", line 57, in <module>
faceCascade = cv.Load("haarcascade_frontalface_default.xml")
cv2.error: The node does not represent a user object (unknown type?)
the source code is this: 源代码是这样的:
#!/usr/bin/python
import cv
import cv2
import time
import Image
def DetectFace(image, faceCascade):
min_size = (20,20)
image_scale = 2
haar_scale = 1.1
min_neighbors = 3
haar_flags = 0
# Allocate the temporary images
grayscale = cv.CreateImage((image.width, image.height), 8, 1)
smallImage = cv.CreateImage(
(
cv.Round(image.width / image_scale),
cv.Round(image.height / image_scale)
), 8 ,1)
# Convert color input image to grayscale
cv.CvtColor(image, grayscale, cv.CV_BGR2GRAY)
# Scale input image for faster processing
cv.Resize(grayscale, smallImage, cv.CV_INTER_LINEAR)
# Equalize the histogram
cv.EqualizeHist(smallImage, smallImage)
# Detect the faces
faces = cv.HaarDetectObjects(
smallImage, faceCascade, cv.CreateMemStorage(0),
haar_scale, min_neighbors, haar_flags, min_size
)
# If faces are found
if faces:
for ((x, y, w, h), n) in faces:
# the input to cv.HaarDetectObjects was resized, so scale the
# bounding box of each face and convert it to two CvPoints
pt1 = (int(x * image_scale), int(y * image_scale))
pt2 = (int((x + w) * image_scale), int((y + h) * image_scale))
cv.Rectangle(image, pt1, pt2, cv.RGB(255, 0, 0), 5, 8, 0)
return image
#----------
# M A I N
#----------
capture = cv.CaptureFromCAM(0)
#capture = cv.CaptureFromFile("test.avi")
faceCascade = cv.Load("haarcascade_frontalface_default.xml")
#faceCascade = cv.Load("haarcascades/haarcascade_frontalface_alt2.xml")
#faceCascade = cv.Load("haarcascades/haarcascade_frontalface_alt.xml")
#faceCascade = cv.Load("haarcascades/haarcascade_frontalface_alt_tree.xml")
while (cv.WaitKey(15)==-1):
img = cv.QueryFrame(capture)
image = DetectFace(img, faceCascade)
cv.ShowImage("face detection test", image)
cv.ReleaseCapture(capture)
I have set-up all right, I followed guide 我已经设置好了,我按照指南进行了
I download all, install all, create and put the right file/drectory. 我下载所有文件,安装所有文件,创建并放入正确的文件/目录。 But still face the error.
但是仍然面临错误。
One of the most common error new developer faces here is old code which refers to old xml file. 新开发人员在这里面临的最常见错误之一是旧代码,它指向旧xml文件。
Download this haarcascade_frontalface_alt.xml xml file and replace 下载此haarcascade_frontalface_alt.xml xml文件并替换
faceCascade = cv.Load("haarcascade_frontalface_default.xml")
with 同
faceCascade = cv.Load("Complete_path_of_THiS_NEW_File")
if you downlaoded the file in downloadfolder then 如果在下载文件夹中下载了文件,则
faceCascade = cv.Load("/home/webadmin/Downloads/haarcascade_frontalface_default.xml")
Hope this helps 希望这可以帮助
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