(-215:Assertion failed)._src:empty() in function 'cv::cvtColor'(PHYTON OPEN CV ERROR)

Question

这是我的代码：

import cv2
import sys
import numpy as np


faceCascade = cv2.CascadeClassifier("Resouces/haarcascade_frontalface_default.xml")

video_capture = cv2.VideoCapture(0)

while True :
    #kare kare webcam den gelen görüntü yakalanıyor
    ret, frame = video_capture.read()

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

    faces = faceCascade.detectMultiScale(
        gray,
        scaleFactor=1.1,
        minNeighbors=5,
        minSize=(30,30),
        #cv2.CASCADE_SCALE_IMAGE
        flags=cv2.CASCADE_SCALE_IMAGE
         )

    #TANIMLANAN YÜZÜN ETRAFINDA YEŞİL BİR KARE OLUŞTURULUYOR
    for(x,y,w,h) in faces:
        cv2.rectangle(frame,(x,y)+(x+w,y+h),(0,255,0),2)

    #SONUC EKRANDA GÖSTERİLİYOR.
    cv2.imshow('Video',frame)

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

    #HERŞEY TAMAMSA EKRAN YAKALAMASI SERBEST BIRAKILIYOR.
    video_capture.release()
    cv2.destroyAllWindows()

我收到以下错误：

文件“C:/Users/EMRE/PycharmProjects/OpencvPhyton/chapter4.py”，第 14 行，灰色 = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY) cv2.error: OpenCV(4.5.1) C:\Users\appveyor \AppData\Local\Temp\1\pip-req-build-oduouqig\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed)._src:empty() in function 'cv ::cvtColor'

Answer 1

在最后两个代码中，删除空格。 然后，请添加 faceCascade 的数据源。 我丢弃了面部表情中的一些参数，因为我意识到你选择了一些错误的参数。 请自行修复。

import cv2
import numpy as np


faceCascade = cv2.CascadeClassifier(cv2.data.haarcascades + "haarcascade_frontalface_default.xml")

video_capture = cv2.VideoCapture(0)

while True :
    #kare kare webcam den gelen görüntü yakalanıyor
    ret, frame = video_capture.read()

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

    faces = faceCascade.detectMultiScale(gray)

    #TANIMLANAN YÜZÜN ETRAFINDA YEŞİL BİR KARE OLUŞTURULUYOR
    for(x,y,w,h) in faces:
        cv2.rectangle(frame,(x,y),(x+w,y+h),(0,255,0),2)

    #SONUC EKRANDA GÖSTERİLİYOR.
    cv2.imshow('Video',frame)

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

    #HERŞEY TAMAMSA EKRAN YAKALAMASI SERBEST BIRAKILIYOR.
video_capture.release()
cv2.destroyAllWindows()