SnapshotPtr UniformSample::getSnapshot() const {
boost::lock_guard<boost::mutex> lock(mutex_);
Int64Vector::const_iterator begin_itr(values_.begin());
Int64Vector::const_iterator end_itr(values_.begin());
std::advance(end_itr, size());
return SnapshotPtr(new Snapshot(ValueVector(begin_itr, end_itr)));
}
SnapshotPtr ExpDecaySample::getSnapshot() const {
ValueVector vals;
vals.reserve(values_.size());
std::lock_guard<std::mutex> rlock(mutex_);
for(Double2Int64Map::const_iterator it = values_.begin(); it != values_.end(); ++it) {
vals.push_back(it->second);
}
return SnapshotPtr(new Snapshot(vals));
}
/**
* @brief Automatically splits the video into several events provided the
* given parameters.
* @param threshold
* @param maxcount
* @param mincount
* @param history
* @param varThreshold
* @param bShadowDetection
* @param path
* @return
*/
std::deque<EventPtr> Video::autoDetectEvents(double threshold,
double maxcount,
double mincount,
int history,
int varThreshold,
bool bShadowDetection,
std::string path){
cv::Mat shot;
FramePtr frame;
SnapshotPtr snap;
EventPtr event;
std::deque<EventPtr> events;
unsigned int j=0;
int emptycount=0;
int framecount=0;
int value;
int absoluteThreshold = threshold/100*resolution.width*resolution.height;
int i;
// Initialization of background subtraction
bgSubInit(history, varThreshold, bShadowDetection);
setFramePos(0);
emit startProgress(0, (uint) getLengthFrames());
while(getNextFrame(shot)){
QCoreApplication::processEvents();
if (toCancel){
events.clear();
canceled();
return events;
}
bg->NewFrame(shot);
bg->Denoise();
emit progressChanged(j);
value = cv::countNonZero(bg->Foreground());
// Detected change
if ( value > absoluteThreshold ){
if (event.isNull()){
event = EventPtr(new Event(this));
}
// create new frame
frame = FramePtr(new Frame(this, shot, path));
snap = SnapshotPtr(new Snapshot(frame, bg->Foreground(), path));
// add frame to event
event->addFrame(frame);
event->addSnapshot(snap);
framecount ++;
emptycount = 0;
}
// Did not detect change
else if (!event.isNull()){
emptycount ++;
// create new frame
frame = FramePtr(new Frame(this, shot, path));
snap = SnapshotPtr(new Snapshot(frame, bg->Foreground(), path));
// add frame to event
event->addFrame(frame);
event->addSnapshot(snap);
framecount ++;
if(emptycount > maxcount){
if (framecount - emptycount > mincount){
// remove extra frames with no movement
for (i = 0; i < maxcount; i++){
event->remLastFrame();
event->remLastSnapshot();
}
events.push_back(event);
}
event.clear();
emptycount = 0;
framecount = 0;
}
}
j++;
}
// Check if Video ended in the middle of an Event.
if (!event.isNull()){
if (framecount > mincount){
events.push_back(event);
} else {
event.clear();
}
}
return events;
}
