9) web camera A clean install of a new bbg image and opencv lead to good results.
IM using an ELP- ELP-USB500W05G-FD100 USB camera. The minimum resolution is 640x480@ 30fps. using the following to get images form the camera and encode the data (after opencv decodes it) yields about .06sec per image (15 fps) with about 1-2 sec lag between realtime and the image displayed in a browser. (@640x480, 50% jpeg quality) I don't know why it makes sense to go form a jpeg stream (mjpeg) to raw data the back to jpegs, but that is an openCV limitation for now. code grabbed and modified from (Website: http://www.chioka.in/) I think the BBG is not well suited for this type of use, but it will be ok. import cv2 import time class VideoCamera(object): def __init__(self): # Using OpenCV to capture from device 0. If you have trouble capturing # from a webcam, comment the line below out and use a video file # instead. self.video = cv2.VideoCapture(0) print( 'camera initialized? ', self.video.isOpened()) self.video.set(3,640) self.video.set(4,480) self.video.set(5,30) # If you decide to use video.mp4, you must have this file in the folder # as the main.py. #self.video = cv2.VideoCapture('video.mp4') def __del__(self): self.video.release() def get_frame(self): #before = time.clock() success=self.video.grab() success,image = self.video.retrieve() # We are using Motion JPEG, but OpenCV defaults to capture raw images, # so we must encode it into JPEG in order to correctly display the # video stream. encodeoptions =[cv2.IMWRITE_JPEG_QUALITY,50] ret, jpeg = cv2.imencode('.jpg', image,encodeoptions) #print time.clock()-before return jpeg.tostring() On Sunday, November 13, 2016 at 4:09:06 PM UTC-6, Chris M wrote: > > Some thoughts and findings as I begin to learn the BBG (Beaglebone Green) > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/35927ff9-9b1d-4108-bc74-41ec09c97c2a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
