I'm using an ELP USB camera that is supposedly rated at 100fps at VGA quality but I don't seem to be getting anywhere near that frame rate. I was wondering if anyone has used an ELP camera with openCV and managed to achieve a frame rate close to 100 fps? Or if anyone has any advice to help increase the frame rate?
I have already tested that the output is MJPEG at 640x420 and I am running cv2.VideoCapture in one thread and placing the frame on a queue. From the main thread I repeatedly ask for frames but only return when the results is not None. This gives a frame rate hovering around 30fps.
import cv2
import time
import numpy as np
from datetime import datetime
from threading import Thread, Lock, Condition
import time
from Queue import Queue
class WebcamVideoStream:
def __init__(self, src=0):
# initialize the video camera stream
self.stream = cv2.VideoCapture(src)
# initialize the variable used to indicate if the thread should
# be stopped
self.stopped = False
self.frame = None
def start(self):
global qt
self.stopped = False
qt = Queue(10)
# start the thread to read frames from the video stream
thread1 = Thread(target=self.update, args=())
thread1.start()
return self
def update(self):
global qt
# keep looping infinitely until the thread is stopped
while True:
if self.stopped:
return
_, self.frame = self.stream.read()
qt.put(self.frame)
def read(self):
global qt
if(not qt.empty()):
self.CurrFrame=qt.get()
if self.CurrFrame is not None:
return self.CurrFrame
if self.stopped:
return
def stop(self):
print('Stop')
# indicate that the thread should be stopped
self.stopped = True
return self
vs = WebcamVideoStream(src=-1).start()
time.sleep(1)
i = 0
t0 = time.time()
while i < 100:
frame = vs.read()
while frame is None:
frame = vs.read()
date_string = datetime.now().strftime("%Y-%m-%d-%H:%M:%S:%f")
i = i + 1
rate = 100/(time.time()-t0)
print(rate)
cv2.destroyAllWindows()
vs.stop()
Thanks in advance
