cv2.error : function setSize에서 (-215) s> = 0

Question

코드를 실행하는 동안이 오류가 발생합니다. 나는 라즈베리 파이가있는 웹캠에서 그림을 잡으려고하는데, 언젠가는 내가 잡은 첫 번째 그림이 비어 있습니다. 그래서 이것을 확인합니다

ret, img = cam.read(); 
     if not ret: continue 

이 오류를 방지하려면 어떻게해야합니까?

Corrupt JPEG data: 1 extraneous bytes before marker 0xd1 OpenCV Error: Assertion failed (s >= 0) in setSize, file /home/pi/opencv-3.2.0/modules/core/src/matrix.cpp, line 307 Traceback (most recent call last): File "total.py", line 248, in facialReco(directory) File "total.py", line 236, in facialReco id, dist, it = reco(faceDetec) File "total.py", line 188, in reco recognizer.predict_collect(gray[yHMax:yHMax + hMax, xHMax:xHMax + wHMax], collector)

cv2.error: /home/pi/opencv-3.2.0/modules/core/src/matrix.cpp:307: error: (-215) s >= 0 in function setSize

내 전체 코드는 다음과 같습니다

def reco(faceDetec): 

    recognizer = cv2.face.createLBPHFaceRecognizer() 
    recognizer.load("recognizer/trainingData_LBPHF.yml") 
    id = 0 
    it = 0 
    dist = 0 
    cam = cv2.VideoCapture(0) 
    # prendre les rectangle ayant la plus grde largeur seulement. 
    while it < 20: 
     ret, img = cam.read(); 

     if not ret: continue 

     cv2.imshow("Face", img); 
     cv2.waitKey(1) 
     gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) 
     faces = faceDetec.detectMultiScale(
      img, 
      scaleFactor=1.2, 
      minNeighbors=7, 
      minSize=(50, 50) 
      ) 

     hMax=0 
     wHMax=0 
     xHMax=0 
     yHMax=0 
     for (x, y, w, h) in faces: 
      if h>hMax: 
       hMax=h 
       wHMax=w 
       xHMax=x 
       yHMax=y 
     collector = cv2.face.StandardCollector_create() 
     recognizer.predict_collect(gray[yHMax:yHMax + hMax, xHMax:xHMax + wHMax], collector) 

     if collector.getMinDist()<65: 
      it += 1 
      dist = dist + collector.getMinDist() 
      id = collector.getMinLabel() 
      numberOfRec(id) 
    cam.release() 
    cv2.destroyAllWindows() 
    req="SELECT studentId FROM Student WHERE numberOfRec=(SELECT MAX(numberOfRec) FROM Student);" 
    cursor.execute(req) 
    rows = cursor.fetchall() 
    for row in rows: 
     id=row[0] 
    req="UPDATE Student SET numberOfRec = %(numberOfRec)" 
    values = {"numberOfRec": 0} 
    cursor.execute(req, values) 
    db.commit() 
    return id, dist, it 

Answer 1

내가 추가하여 오류를 수정 관리 '하지 IMG는 아무도없는 경우 :'

def reco(faceDetec): 

    recognizer = cv2.face.createLBPHFaceRecognizer() 
    recognizer.load("recognizer/trainingData_LBPHF.yml") 
    id = 0 
    it = 0 
    dist = 0 
    cam = cv2.VideoCapture(0) 
    # prendre les rectangle ayant la plus grde largeur seulement. 
    while it < 20: 
     ret, img = cam.read(); 
     if not img is None: 
      if not ret: continue 

       cv2.imshow("Face", img); 
       cv2.waitKey(1) 
       gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) 
       faces = faceDetec.detectMultiScale(
        img, 
        scaleFactor=1.2, 
        minNeighbors=7, 
        minSize=(50, 50) 
        ) 

       hMax=0 
       wHMax=0 
       xHMax=0 
       yHMax=0 
       for (x, y, w, h) in faces: 
        if h>hMax: 
         hMax=h 
         wHMax=w 
         xHMax=x 
         yHMax=y 
       collector = cv2.face.StandardCollector_create() 
       recognizer.predict_collect(gray[yHMax:yHMax + hMax,   xHMax:xHMax + wHMax], collector) 

       if collector.getMinDist()<65: 
        it += 1 
        dist = dist + collector.getMinDist() 
        id = collector.getMinLabel() 
        numberOfRec(id) 
    cam.release() 
    cv2.destroyAllWindows() 
    req="SELECT studentId FROM Student WHERE numberOfRec=(SELECT MAX(numberOfRec) FROM Student);" 
    cursor.execute(req) 
    rows = cursor.fetchall() 
    for row in rows: 
     id=row[0] 
    req="UPDATE Student SET numberOfRec = %(numberOfRec)" 
    values = {"numberOfRec": 0} 
    cursor.execute(req, values) 
    db.commit() 
    return id, dist, it 

가