質問編集履歴
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### 発生している問題・エラーメッセージ
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```python
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(-215:Assertion failed) !empty() in function 'cv::
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error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'
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```
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```python
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gray = cv2.cvtColor(rgb, cv2.COLOR_RGB2GRAY)
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gray = cv2.cvtColor(rgb, cv2.COLOR_RGB2GRAY)
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faces = face_cascade.detectMultiScale(
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gray, scaleFactor=1.11, minNeighbors=3, minSize=(100, 100))
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```
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### 全体のソースコード
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```python
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import os,sys
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import cv2
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cap = cv2.VideoCapture(0)
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face_cascade = cv2.CascadeClassifier('Users/User/Documents/eye/opencv-
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face_cascade = cv2.CascadeClassifier('Users/User/Documents/eye/opencv-4.2.0/data/haarcascades/haarcascade_frontalface_alt2.xml')
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face_parts_detector = dlib.shape_predictor('shape_predictor_68_face_landmarks.dat')
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faces = face_cascade.detectMultiScale(
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gray, scaleFactor=1.11, minNeighbors=3, minSize=(100, 100))
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if (left_eye_ear + right_eye_ear) < 0.55:
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cv2.putText(rgb,"
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cv2.putText(rgb,"close",
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(10,180), cv2.FONT_HERSHEY_PLAIN, 3, (0,0,255), 3, 1)
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cv2.destroyAllWindows()
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```
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### 試したこと
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