PiCameraValueError: Incorrect buffer length for resolution 1920x1080
这是我检测圆/球的代码。
我想从Pi相机中检测出足球。 (足球可以是任何颜色。)我遇到了一些PiCameraValueError问题。 这段代码有什么问题。 我正在使用Raspberry Pi 2，Python2和OpenCV。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | from picamera.array import PiRGBArray from picamera import PiCamera import time import cv2 import sys import imutils import cv2.cv as cv # initialize the camera and grab a reference to the raw camera capture camera = PiCamera() rawCapture = PiRGBArray(camera) # capture frames from the camera for frame in camera.capture_continuous(rawCapture, format="bgr"): # grab the raw NumPy array representing the image, then initialize the timestamp # and occupied/unoccupied text image = frame.array img = cv2.medianBlur(image, 5) imgg = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY) cimg = cv2.cvtColor(imgg, cv2.COLOR_GRAY2BGR) imgg = cv2.blur(imgg, (3,3)) #imgg = cv2.dilate(imgg, np.ones((5, 5))) #imgg = cv2.GaussianBlur(imgg,(5,5),0) circles = cv2.HoughCircles(imgg, cv.CV_HOUGH_GRADIENT, 1, 20, param1=100, param2=40, minRadius=5, maxRadius=90) cv2.imshow("cimg", imgg) key = cv2.waitKey(1) if key & 0xFF == ord('q'): break if circles is None: continue print circles #circles = np.uint16(np.around(circles)) for i in circles[0,:]: cv2.circle(cimg,(i[0],i[1]),i[2],(0,255,0),1) # draw the outer circle #cv2.circle(cimg,(i[0],i[1]),2,(0,0,255),3) # draw the center of the circle cv2.imshow("Filtered", cimg) cv2.destroyWindow("cimg") cv2.destroyAllWindows() |
如这里所解释的，
the
PiCameraValueError is a secondary exception raised in response to
the KeyboardInterrupt exception. This is quite normal and not a bug
(it's more a consequence of how generic the output mechanism is in
picamera), but it is difficult to detect and respond to in Python 2
(the usual method there would probably be to catch the
PiCameraValueError as well in whatever loop your main script runs).
Under Python 3, exception chaining is implemented so you could
potentially look back through the stack of exceptions to find the
KeyboardInterrupt one.
您需要做的是清除捕获之间的流。 PiRGBArray文档用截断功能覆盖了这一点。
这是一个例子，python face检测覆盆子pi与picamera
1 2 3 4 5 6 7 8 9 10 11 12 13 | import io import time import picamera with picamera.PiCamera() as camera: stream = io.BytesIO() for foo in camera.capture_continuous(stream, format='jpeg'): # YOURS: for frame in camera.capture_continuous(stream, format="bgr", use_video_port=True): # Truncate the stream to the current position (in case # prior iterations output a longer image) stream.truncate() stream.seek(0) if process(stream): break |