From 514711af146263bf8a8e7ae5a010587dcddfa851 Mon Sep 17 00:00:00 2001
From: Alexander Mordvintsev <no@email>
Date: Sun, 10 Jul 2011 21:23:32 +0000
Subject: [PATCH] work on motempl.py sample
---
samples/python2/common.py | 6 ++++
samples/python2/lk_track.py | 6 ++--
samples/python2/motempl.py | 56 +++++++++++++++++++++++++++++++++++++
3 files changed, 66 insertions(+), 2 deletions(-)
create mode 100644 samples/python2/motempl.py
diff --git a/samples/python2/common.py b/samples/python2/common.py
index e5eefd452..636ef6986 100644
--- a/samples/python2/common.py
+++ b/samples/python2/common.py
@@ -109,3 +109,9 @@ def make_cmap(name, n=256):
ch = np.interp(xs, xp, yp)
channels.append(ch)
return np.uint8(np.array(channels).T*255)
+
+def nothing(*arg, **kw):
+ pass
+
+def clock():
+ return cv2.getTickCount() / cv2.getTickFrequency()
\ No newline at end of file
diff --git a/samples/python2/lk_track.py b/samples/python2/lk_track.py
index 65346de40..9987f26f3 100644
--- a/samples/python2/lk_track.py
+++ b/samples/python2/lk_track.py
@@ -20,7 +20,7 @@ lk_params = dict( winSize = (3, 3),
criteria = (cv2.TERM_CRITERIA_EPS | cv2.TERM_CRITERIA_COUNT, 10, 0.03),
derivLambda = 0.0 )
-feature_params = dict( maxCorners = 500,
+feature_params = dict( maxCorners = 1000,
qualityLevel = 0.1,
minDistance = 5,
blockSize = 5 )
@@ -42,6 +42,8 @@ def main():
try: video_src = sys.argv[1]
except: video_src = video.presets['chess']
+ cv2.namedWindow('img', 0)
+
track_len = 4
tracks = []
cam = video.create_capture(video_src)
@@ -63,7 +65,7 @@ def main():
tr.append((x, y))
if len(tr) > 10:
del tr[0]
- cv2.circle(vis, (x, y), 2, (0, 255, 0), -2)
+ cv2.circle(vis, (x, y), 2, (0, 255, 0), -1)
cv2.polylines(vis, [np.int32(tr) for tr in tracks], False, (0, 255, 0))
draw_str(vis, (20, 20), ['new', 'old'][old_mode]+' mode')
draw_str(vis, (20, 40), 'time: %.02f ms' % (dt*1000))
diff --git a/samples/python2/motempl.py b/samples/python2/motempl.py
new file mode 100644
index 000000000..f867b2e73
--- /dev/null
+++ b/samples/python2/motempl.py
@@ -0,0 +1,56 @@
+import numpy as np
+import cv2, cv
+import video
+from common import nothing, clock, draw_str
+
+MHI_DURATION = 1.0
+DEFAULT_THRESHOLD = 16
+MAX_TIME_DELTA = 0.5
+MIN_TIME_DELTA = 0.05
+
+
+if __name__ == '__main__':
+ import sys
+ try: video_src = sys.argv[1]
+ except: video_src = 'synth:class=chess:bg=../cpp/lena.jpg:noise=0.01'
+
+ cv2.namedWindow('motempl')
+ visuals = ['input', 'frame_diff', 'motion_hist', 'grad_orient']
+ cv2.createTrackbar('visual', 'motempl', 2, len(visuals)-1, nothing)
+ cv2.createTrackbar('threshold', 'motempl', DEFAULT_THRESHOLD, 255, nothing)
+
+ cam = video.create_capture(video_src)
+ ret, frame = cam.read()
+ h, w = frame.shape[:2]
+ prev_frame = frame.copy()
+ motion_history = np.zeros((h, w), np.float32)
+ hsv = np.zeros((h, w, 3), np.uint8)
+ hsv[:,:,1] = 255
+ while True:
+ ret, frame = cam.read()
+ frame_diff = cv2.absdiff(frame, prev_frame)
+ gray_diff = cv2.cvtColor(frame_diff, cv.CV_BGR2GRAY)
+ thrs = cv2.getTrackbarPos('threshold', 'motempl')
+ ret, motion_mask = cv2.threshold(gray_diff, thrs, 255, cv2.THRESH_BINARY)
+ timestamp = clock()
+ cv2.updateMotionHistory(motion_mask, motion_history, timestamp, MHI_DURATION)
+ mg_mask, mg_orient = cv2.calcMotionGradient( motion_history, MAX_TIME_DELTA, MIN_TIME_DELTA, apertureSize=5 );
+
+ visual_name = visuals[cv2.getTrackbarPos('visual', 'motempl')]
+ if visual_name == 'input':
+ vis = frame.copy()
+ elif visual_name == 'frame_diff':
+ vis = frame_diff.copy()
+ elif visual_name == 'motion_hist':
+ vis = np.uint8(np.clip((motion_history-(timestamp-MHI_DURATION)) / MHI_DURATION, 0, 1)*255)
+ vis = cv2.cvtColor(vis, cv.CV_GRAY2BGR)
+ elif visual_name == 'grad_orient':
+ hsv[:,:,0] = mg_orient/2
+ hsv[:,:,2] = mg_mask*255
+ vis = cv2.cvtColor(hsv, cv.CV_HSV2BGR)
+ draw_str(vis, (20, 20), visual_name)
+ cv2.imshow('motempl', vis)
+
+ prev_frame = frame.copy()
+ if cv2.waitKey(5) == 27:
+ break
\ No newline at end of file