Harr Cascade CV2 错误：(-215) scn == 3 ||函数 cv::ipp_cvtColor 中的 scn == 4

Question

刚刚进入视觉编程并遇到了一个问题。这是我的代码：

import numpy as np
import cv2

# multiple cascades: https://github.com/Itseez/opencv/tree/master/data/haarcascades

#https://github.com/Itseez/opencv/blob/master/data/haarcascades/haarcascade_frontalface_default.xml
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
#https://github.com/Itseez/opencv/blob/master/data/haarcascades/haarcascade_eye.xml
eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')

cap = cv2.VideoCapture(0)

while 1:
    ret, img = cap.read()
    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)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

我收到错误

OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cv::ipp_cvtColor, file C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp, line 7456

Traceback (most recent call last):
  File "C:/Users/Peter/PycharmProjects/untitled/FaceDetection.py", line 15, in <module>
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.error: C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:7456: error: (-215) scn == 3 || scn == 4 in function cv::ipp_cvtColor

我可以找到使用静态图像而不是视频源时解决此问题的示例。我检查了 img.shape，它是 3 维的，所以这不是我的问题。有什么想法吗？

谢谢

Answer 1

更改：

while 1:

至：

while ret == True:

希望这有帮助！

Answer 2

可能“haarcascade_frontalface_default.xml”不在我们的脚本所在的文件夹中。