when i run the programme, it reveals cv2.error:
OpenCV(4.0.0) C:\projects\opencv-python\opencv\modules\objdetect\cascadedetect.cpp:1658: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScales
my code is there:
import cv2
import numpy as np
face_cascade = cv2.CascadeClassifier('data/haarcascade/haarcascade_frontalface_alt2.xml')
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(gray, scaleFactor=1.5, minNeighbors=5)
for (x, y, w, h) in faces:
print(x,y,w,h)
roi_gray = gray[y:y + h, x:x + w] # (ycord_start, ycord_end)
roi_color = frame[y:y + h, x:x + w]
img_item = 'my-image.png'
cv2.imwrite(img_item,roi_gray)
cv2.imshow('frame',frame)
color = (0,0,255)
stroke = 2
width = x + w
height = y + h
cv2.rectangle(frame,(x,y), (width, height, color, stroke))
if cv2.waitKey(20) & 0xFF == ord('q'):
break
pls be specific.
Many Thanks
↧