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Python

#!/usr/bin/env python
from __future__ import print_function
import cv2, os, sys, time
import numpy as np
from argparse import ArgumentParser
def draw(flow):
h, w = flow.shape[:2]
fx, fy = flow[:,:,0], flow[:,:,1]
ang = np.arctan2(fy, fx) + np.pi
v = np.sqrt(fx*fx+fy*fy)
# hsv = np.zeros((h, w, 3), np.uint8)
# hsv[...,0] = ang*(180/np.pi/2)
# hsv[...,1] = 255
# hsv[...,2] = np.minimum(v*4, 255)
# bgr = cv2.cvtColor(hsv, cv2.COLOR_HSV2BGR)
f = np.zeros((h, w, 3), np.uint8)
f[...,0] = 0 #np.minimum(v*10, 255)
f[...,1] = 0
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f[...,2] = 255- np.minimum(v**3, 255) #ang*(180/np.pi/2)
bgr = cv2.cvtColor(f, cv2.COLOR_HSV2BGR)
return bgr
p = ArgumentParser("")
p.add_argument("--video", type=int, default=0, help="video, default: 0")
p.add_argument("--output", default=None, help="path to save movie, default: None (show live)")
p.add_argument("--width", type=int, default=640, help="pre-detect resize width")
p.add_argument("--height", type=int, default=480, help="pre-detect resize height")
p.add_argument("--fourcc", default="XVID", help="MJPG,mp4v,XVID")
p.add_argument("--framerate", type=float, default=25, help="output frame rate")
p.add_argument("--show", default=False, action="store_true")
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p.add_argument("--frames", type=int, default=100)
args = p.parse_args()
fourcc = None
cam = cv2.VideoCapture(args.video)
cam.set(cv2.cv.CV_CAP_PROP_FRAME_WIDTH, args.width)
cam.set(cv2.cv.CV_CAP_PROP_FRAME_HEIGHT, args.height)
if args.output:
try:
fourcc = cv2.cv.CV_FOURCC(*args.fourcc)
except AttributeError:
fourcc = cv2.VideoWriter_fourcc(*args.fourcc)
out = cv2.VideoWriter()
out.open(args.output, fourcc, args.framerate, (args.width, args.height))
else:
out = None
while True:
ret, prev = cam.read()
prevgray = cv2.cvtColor(prev, cv2.COLOR_BGR2GRAY)
if prevgray.shape == (args.height, args.width):
break
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count = 0
try:
while True:
ret, frame = cam.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
flow = cv2.calcOpticalFlowFarneback(prevgray, gray, 0.5, 3, 15, 3, 5, 1.2, 0)
prevgray = gray
frame = draw(flow)
if out != None:
out.write(frame)
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count += 1
if args.show:
cv2.imshow('display', frame)
if cv2.waitKey(5) & 0xFF == ord('q'):
break
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if args.frames != None:
if (count >= args.frames):
break
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except KeyboardInterrupt:
pass
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print ("\nCleaning up... Wrote", count, "frames")
if out:
out.release()
if args.show:
cv2.destroyAllWindows()