def getCrossings(self, cc, horizontal):
if horizontal:
step = cc.normalized.shape[1] / float(self.count_crossings + 1)
else:
step = cc.normalized.shape[0] / float(self.count_crossings + 1)
counts = []
mins = []
maxs = []
for i in range(self.count_crossings):
pos = int((i + 1) * step)
# the crossing is threated in terms of boolean intervals...
booleans = []
if horizontal:
#horizontal -> y fixed and x moves
for x in range(cc.normalized.shape[1]):
booleans.append(cc.normalized[pos, x] > 128.0)
else:
#vertical -> x fixed and y moves
for y in range(cc.normalized.shape[0]):
booleans.append(cc.normalized[y, pos] > 128.0)
# find the intervals...
intervals = MiscHelper.findBooleanIntervals(booleans, True)
# now, get the middle points for each interval...
midPoints = MiscHelper.intervalMidPoints(intervals)
# normalize values
midPoints = MiscHelper.scaleValues(midPoints, 0,
cc.normalized.shape[0] - 1, -1,
1)
counts.append(len(intervals))
if len(intervals) > 0:
mins.append(midPoints[0])
maxs.append(midPoints[-1])
else:
mins.append(1.1)
maxs.append(-1.1)
counts = MiscHelper.scaleValues(counts, 0, 10, -3, 3)
return counts + mins + maxs
def selectMotionlessFrames(self):
#maximum motion allowed
threshold = 0
booleans = []
for idx, m in enumerate(self.motion_detected):
booleans.append(m.count_changes <= threshold)
intervals = MiscHelper.findBooleanIntervals(booleans, True)
#only consider intervals of at least 3 frames
candidates = []
for ini, end in intervals:
#check....
if end - ini >= 2:
#pick the frame in the middle of the interval
middle = self.motion_detected[int((end + ini) / 2.0)]
candidates.append((middle.video_index, middle.time))
return candidates
def getNonblockedIntervals(self, region_box, max_width, max_height,
init_index, end_time):
#Find a frame where the found region has no motion around
pos = init_index
blocked_list = []
while pos < len(self.motion_detected) and \
self.motion_detected[pos].absolute_time < end_time:
#check motion[pos] to see if main_region is blocked
blocked = self.motion_detected[pos].isBlockingRegion(
region_box, max_width, max_height, 3.0, 3.0)
#add to boolean list
blocked_list.append(blocked)
pos += 1
#now find the intervals where it is not obstruded...
intervals = MiscHelper.findBooleanIntervals(blocked_list, False)
return intervals