Question

我正在尝试使用opencv-python在Raspberry Pi 3上进行面部检测。该程序应该使用从连接的网络摄像头抓取的帧。在faceCascade = cv2.CascadeClassifier(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")行中，出现以下错误：

Traceback (most recent call last):
  File "2webcam_cv3.py", line 32, in <module>
    minSize=(30, 30)
cv2.error: OpenCV(3.4.3) /home/pi/opencv-python/opencv/modules/objdetect/src/cascadedetect.cpp:1698: error: (-215:Assertion failed) !empty() in function 'detectMultiScale'

我已经阅读了其他问题，该错误表示无法加载XML文件。

我尝试了文件系统中的直接链接，例如/home/pi/faceDetection/haarcascade_frontalface_default.xml，以及指向github文件的链接。坦白说，我没主意了。

这是完整的代码：

import cv2
import sys
import logging as log
import datetime as dt
from time import sleep


print(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")

faceCascade = cv2.CascadeClassifier(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")
log.basicConfig(filename='webcam.log',level=log.INFO)

video_capture = cv2.VideoCapture(0)
anterior = 0

while True:
    if not video_capture.isOpened():
        print('Unable to load camera.')
        sleep(5)
        pass

    # Capture frame-by-frame
    ret, frame = video_capture.read()

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    faces = faceCascade.detectMultiScale(
        gray,
        scaleFactor=1.1,
        minNeighbors=5,
        minSize=(30, 30)
    )

    # Draw a rectangle around the faces
    for (x, y, w, h) in faces:
        cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 0), 2)

    if anterior != len(faces):
        anterior = len(faces)
        log.info("faces: "+str(len(faces))+" at "+str(dt.datetime.now()))


    # Display the resulting frame
    cv2.imshow('Video', frame)


    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

    # Display the resulting frame
    cv2.imshow('Video', frame)

# When everything is done, release the capture
video_capture.release()
cv2.destroyAllWindows()

第print(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")行返回/usr/local/lib/python3.7/dist-packages/cv2/data/haarcascade_frontalface_default.xml，这是一个非空文件。

预期结果：嗯，一个带有摄像机流的窗口，包括检测到的面部上的矩形

结果：错误

  File "2webcam_cv3.py", line 32, in <module>
    minSize=(30, 30)
cv2.error: OpenCV(3.4.3) /home/pi/opencv-python/opencv/modules/objdetect/src/cascadedetect.cpp:1698: error: (-215:Assertion failed) !empty() in function 'detectMultiScale' ```

运行OpenCV给我一个Cascade.cpp：1698错误：（-215：Assertion Failed）（空-失败：断言失败）！empty（）在函数'detectMultiScale'中

0 个答案: