我正在学习有关[Python + OpenCV + mediapipe]手部跟踪的教程，并收到以下错误：

Question

我得到以下错误：

cv2.error: OpenCV(4.5.1) C:UsersappveyorAppDataLocalTemp1pip-req-build-wvn_it83opencvmodulesimgprocsrccolor.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

这是我的代码

import mediapipe as mp
import time

cap = cv2.VideoCapture(1)

mpHands = mp.solutions.hands
hands = mpHands.Hands()
mpDraw = mp.solutions.drawing_utils

pTime = 0
cTime = 0

while True:
success, img = cap.read()
imgRGB = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
results = hands.process(imgRGB)
# print(results.multi_hand_landmarks)

if results.multi_hand_landmarks:
for handLms in results.multi_hand_landmarks:
for id, lm in enumerate(handLms.landmark):
# print(id, lm)
h, w, c = img.shape
cx, cy = int(lm.x * w), int(lm.y * h)
print(id, cx, cy)
# if id == 4:
cv2.circle(img, (cx, cy), 15, (255, 0, 255), cv2.FILLED)

mpDraw.draw_landmarks(img, handLms, mpHands.HAND_CONNECTIONS)

cTime = time.time()
fps = 1 / (cTime - pTime)
pTime = cTime

cv2.putText(img, str(int(fps)), (10, 70), cv2.FONT_HERSHEY_PLAIN, 3,
(255, 0, 255), 3)

cv2.imshow("Image", img)
cv2.waitKey(1)

Answer 1

尝试检查并添加这些行。

...
cap = cv2.VideoCapture(1, cv2.CAP_DSHOW) # Additional argument here

...
while cap.isOpened():
success, img = cap.read()
if not success: # Add break if not successful
break
...
cv2.waitKey(1)
# This will close the capture and cv2 properly
cap.release()
cv2.destroyAllWindows()