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mosse.py
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mosse.py
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#!/usr/bin/env python
'''
MOSSE tracking sample
This sample implements correlation-based tracking approach, described in [1].
Usage:
mosse.py [--pause] [<video source>]
--pause - Start with playback paused at the first video frame.
Useful for tracking target selection.
Draw rectangles around objects with a mouse to track them.
Keys:
SPACE - pause video
c - clear targets
[1] David S. Bolme et al. "Visual Object Tracking using Adaptive Correlation Filters"
http://www.cs.colostate.edu/~bolme/publications/Bolme2010Tracking.pdf
'''
import numpy as np
import cv2
from opencv_common import draw_str, RectSelector
def rnd_warp(a):
h, w = a.shape[:2]
T = np.zeros((2, 3))
coef = 0.2
ang = (np.random.rand()-0.5)*coef
c, s = np.cos(ang), np.sin(ang)
T[:2, :2] = [[c,-s], [s, c]]
T[:2, :2] += (np.random.rand(2, 2) - 0.5)*coef
c = (w/2, h/2)
T[:,2] = c - np.dot(T[:2, :2], c)
return cv2.warpAffine(a, T, (w, h), borderMode = cv2.BORDER_REFLECT)
def divSpec(A, B):
Ar, Ai = A[...,0], A[...,1]
Br, Bi = B[...,0], B[...,1]
C = (Ar+1j*Ai)/(Br+1j*Bi)
C = np.dstack([np.real(C), np.imag(C)]).copy()
return C
eps = 1e-5
def vertex(x2, y1, y2, y3):
return x2 + 0.5 * (y3 - y1) / (2*y2 - y1 - y3)
def fix8(*s):
return tuple(int(round(x * 256)) for x in s)
class MOSSE:
def __init__(self, frame, rect):
x1, y1, x2, y2 = rect
w, h = map(cv2.getOptimalDFTSize, [int(x2-x1), int(y2-y1)])
self.pos = x, y = np.float32([x1+x2, y1+y2]) / 2.0
self.size = w, h
img = cv2.getRectSubPix(frame, (w, h), (x, y))
self.win = cv2.createHanningWindow((w, h), cv2.CV_32F)
g = np.zeros((h, w), np.float32)
g[h//2, w//2] = 1
g = cv2.GaussianBlur(g, (-1, -1), 2.0)
g /= g.max()
self.G = cv2.dft(g, flags=cv2.DFT_COMPLEX_OUTPUT)
self.H1 = np.zeros_like(self.G)
self.H2 = np.zeros_like(self.G)
for i in xrange(128):
a = self.preprocess(rnd_warp(img))
A = cv2.dft(a, flags=cv2.DFT_COMPLEX_OUTPUT)
self.H1 += cv2.mulSpectrums(self.G, A, 0, conjB=True)
self.H2 += cv2.mulSpectrums( A, A, 0, conjB=True)
self.update_kernel()
self.update(frame)
def track(self, frame, pos=None):
(x, y), (w, h) = self.pos, self.size
if pos is not None:
(x,y) = pos
self.last_img = img = cv2.getRectSubPix(frame, (w, h), (x, y))
img = self.preprocess(img)
self.last_resp, (dx, dy), self.psr = self.correlate(img)
self.good = self.psr > 8.0
return np.array([dx, dy])
def adapt(self, frame, pos, rate=0.125):
(w, h) = self.size
self.pos = (x,y) = pos
self.last_img = img = cv2.getRectSubPix(frame, (w, h), (x, y))
img = self.preprocess(img)
A = cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT)
H1 = cv2.mulSpectrums(self.G, A, 0, conjB=True)
H2 = cv2.mulSpectrums( A, A, 0, conjB=True)
self.H1 = self.H1 * (1.0-rate) + H1 * rate
self.H2 = self.H2 * (1.0-rate) + H2 * rate
self.update_kernel()
def update(self, frame, rate=0.125):
(dx,dy) = self.track(frame)
if not self.good:
return
(x,y) = self.pos
self.adapt(frame, pos=(x+dx, y+dy), rate=rate)
@property
def state_vis(self):
f = cv2.idft(self.H, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT )
h, w = f.shape
f = np.roll(f, -h//2, 0)
f = np.roll(f, -w//2, 1)
kernel = np.uint8( (f-f.min()) / f.ptp()*255 )
resp = self.last_resp
resp = np.uint8(np.clip(resp/resp.max(), 0, 1)*255)
vis = np.hstack([self.last_img, kernel, resp])
return vis
def draw_state(self, vis, scale=1):
(x, y), (w, h) = self.pos, self.size
x *= scale
y *= scale
w *= scale
h *= scale
x1, y1, x2, y2 = (x-0.5*w), (y-0.5*h), (x+0.5*w), (y+0.5*h)
cv2.rectangle(vis,
fix8(x1, y1),
fix8(x2, y2),
(0, 0, 255), thickness=2, shift=8)
if self.good:
cv2.circle(vis,
fix8(int(x), int(y)),
fix8(4)[0],
(0, 0, 255), -1, shift=8)
else:
cv2.line(vis,
fix8(x1, y1),
fix8(x2, y2),
(0, 0, 255), thickness=2, shift=8)
cv2.line(vis,
fix8(x2, y1),
fix8(x1, y2),
(0, 0, 255), thickness=2, shift=8)
draw_str(vis, (int(x1), int(y2+32)), 'PSR: %.2f' % self.psr)
def preprocess(self, img):
img = np.log(np.float32(img)+1.0)
img = (img-img.mean()) / (img.std()+eps)
return img*self.win
def correlate(self, img):
C = cv2.mulSpectrums(cv2.dft(img, flags=cv2.DFT_COMPLEX_OUTPUT), self.H, 0, conjB=True)
resp = cv2.idft(C, flags=cv2.DFT_SCALE | cv2.DFT_REAL_OUTPUT)
h, w = resp.shape
_, mval, _, (mx, my) = cv2.minMaxLoc(resp)
fmx = vertex(mx, *resp[my,mx-1:mx+2]) if (1 <= mx <= w-1) else mx
fmy = vertex(my, *resp[my-1:my+2,mx]) if (1 <= my <= h-1) else my
#print (mx - w//2, my - h//2), (fmx - w//2, fmy - h//2)
side_resp = resp.copy()
cv2.rectangle(side_resp, (mx-5, my-5), (mx+5, my+5), 0, -1)
smean, sstd = side_resp.mean(), side_resp.std()
psr = (mval-smean) / (sstd+eps)
return resp, (fmx-w//2, fmy-h//2), psr
def update_kernel(self):
self.H = divSpec(self.H1, self.H2)
self.H[...,1] *= -1
class App:
def __init__(self, video_src, paused = False):
self.cap = video.create_capture(video_src)
_, self.frame = self.cap.read()
cv2.imshow('frame', self.frame)
self.rect_sel = RectSelector('frame', self.onrect)
self.trackers = []
self.paused = paused
def onrect(self, rect):
frame_gray = cv2.cvtColor(self.frame, cv2.COLOR_BGR2GRAY)
tracker = MOSSE(frame_gray, rect)
self.trackers.append(tracker)
def run(self):
while True:
if not self.paused:
ret, self.frame = self.cap.read()
if not ret:
break
frame_gray = cv2.cvtColor(self.frame, cv2.COLOR_BGR2GRAY)
for tracker in self.trackers:
tracker.update(frame_gray)
vis = self.frame.copy()
for tracker in self.trackers:
tracker.draw_state(vis)
if len(self.trackers) > 0:
cv2.imshow('tracker state', self.trackers[-1].state_vis)
self.rect_sel.draw(vis)
cv2.imshow('frame', vis)
ch = cv2.waitKey(10)
if ch == 27:
break
if ch == ord(' '):
self.paused = not self.paused
if ch == ord('c'):
self.trackers = []
if __name__ == '__main__':
print __doc__
import sys, getopt
opts, args = getopt.getopt(sys.argv[1:], '', ['pause'])
opts = dict(opts)
try: video_src = args[0]
except: video_src = '0'
App(video_src, paused = '--pause' in opts).run()