hyperion.ng/libsrc/blackborder/BlackBorderProcessor.cpp
wisc 4bc11548b4 faster detection less false positive
Former-commit-id: 501de9bca4c20600fe1e6250e82143f0b0d6ade3
2016-01-10 18:42:55 +01:00

90 lines
2.3 KiB
C++

// Blackborder includes
#include <blackborder/BlackBorderProcessor.h>
using namespace hyperion;
BlackBorderProcessor::BlackBorderProcessor(const unsigned unknownFrameCnt,
const unsigned borderFrameCnt,
const unsigned blurRemoveCnt,
uint8_t blackborderThreshold) :
_unknownSwitchCnt(unknownFrameCnt),
_borderSwitchCnt(borderFrameCnt),
_blurRemoveCnt(blurRemoveCnt),
_detector(blackborderThreshold),
_currentBorder({true, -1, -1}),
_previousDetectedBorder({true, -1, -1}),
_consistentCnt(0),
_inconsistentCnt(0)
{
// empty
}
BlackBorder BlackBorderProcessor::getCurrentBorder() const
{
return _currentBorder;
}
bool BlackBorderProcessor::updateBorder(const BlackBorder & newDetectedBorder)
{
// set the consistency counter
if (newDetectedBorder == _previousDetectedBorder)
{
++_consistentCnt;
_inconsistentCnt = 0;
}
else
{
_previousDetectedBorder = newDetectedBorder;
_consistentCnt = 0;
++_inconsistentCnt;
}
// check if there is a change
if (_currentBorder == newDetectedBorder)
{
// No change required
return false;
}
bool borderChanged = false;
if (newDetectedBorder.unknown)
{
// apply the unknown border if we consistently can't determine a border
if (_consistentCnt == _unknownSwitchCnt)
{
_currentBorder = newDetectedBorder;
borderChanged = true;
}
}
else
{
// apply the detected border if it has been detected consistently
if (_currentBorder.unknown || _consistentCnt == _borderSwitchCnt)
{
_currentBorder = newDetectedBorder;
borderChanged = true;
}
else
{
bool stable = (_consistentCnt >= 10) || (_inconsistentCnt >=30 );
//more then 10 consistent seems like a new size not only a short flicker
//more then 30 inconsistent seems like the image is changing a lot and we need to set smaller border
// apply smaller borders (almost) immediately -> avoid switching for "abnormal" frames
if ( (newDetectedBorder.verticalSize < _currentBorder.verticalSize) && (stable) )
{
_currentBorder.verticalSize = newDetectedBorder.verticalSize;
borderChanged = true;
}
if ( (newDetectedBorder.horizontalSize < _currentBorder.horizontalSize) && (stable) )
{
_currentBorder.horizontalSize = newDetectedBorder.horizontalSize;
borderChanged = true;
}
}
}
return borderChanged;
}