出现错误:
Traceback (most recent call last):
File "motion_detector.py", line 21, in <module>
(_, cnts, _) = cv2.findContours(thresh_frame.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
ValueError: not enough values to unpack (expected 3, got 2)
在图像中检测轮廓时遇到了问题。已经仔细查看了教程并从Stack Overflow上寻找答案,但仍然无法找到解决方案。使用的是Python 3.6.4和OpenCV 4.0.0。感谢您的帮助!
代码如下:
import cv2, time
first_frame = None
video = cv2.VideoCapture(0)
while True:
check, frame = video.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
gray = cv2.GaussianBlur(gray,(21,21),0)
if first_frame is None:
first_frame = gray
delta_frame = cv2.absdiff(first_frame, gray)
thresh_frame = cv2.threshold(delta_frame, 30, 255, cv2.THRESH_BINARY)[1]
thresh_frame = cv2.dilate(thresh_frame, None, iterations = 2)
(_, cnts, _) = cv2.findContours(thresh_frame.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
for contour in cnts:
if cv2.contourArea(contour) < 1000:
continue
(x, y, w, h) = cv2.boundingRect(contour)
cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 3)
cv2.imshow("Gray Frame", gray)
cv2.imshow("Delta Frame", delta_frame)
cv2.imshow("Threshold Frame", thresh_frame)
cv2.imshow("Color Frame", frame)
key = cv2.waitKey(1)
print(gray)
print(delta_frame)
if key == ord('q'):
break
video.release()
cv2.destroyAllWindows
(_, cnts, _)
更改为contours, hierarchy
有所帮助。谢谢。 - Egon