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faster detection less false positive

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Former-commit-id: 501de9bca4c20600fe1e6250e82143f0b0d6ade3
This commit is contained in:
wisc 2016-01-10 18:42:55 +01:00
parent ac86a779b0
commit 4bc11548b4
3 changed files with 8 additions and 64 deletions
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53
include/blackborder/BlackBorderDetector.h
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@ -62,15 +62,13 @@ namespace hyperion
BlackBorder process(const Image<Pixel_T> & image)
{
// only test the topleft third of the image
// test center and 1/3, 2/3 of width/heigth
int width = image.width() / 3;
int height = image.height() / 3;
int width2 = width * 2;
int height2 = height * 2;
int xCenter = image.width() / 2;
int yCenter = image.height() / 2;
// int maxSize = std::max(width, height);
int firstNonBlackXPixelIndex = -1;
@ -102,55 +100,6 @@ namespace hyperion
}
}
/*
// only test the topleft third of the image
int width = image.width() /3;
int height = image.height() / 3;
int maxSize = std::max(width, height);
int firstNonBlackXPixelIndex = -1;
int firstNonBlackYPixelIndex = -1;
// find some pixel of the image
for (int i = 0; i < maxSize; ++i)
{
int x = std::min(i, width);
int y = std::min(i, height);
const Pixel_T & color = image(x, y);
if (!isBlack(color))
{
firstNonBlackXPixelIndex = x;
firstNonBlackYPixelIndex = y;
break;
}
}
// expand image to the left
for(; firstNonBlackXPixelIndex > 0; --firstNonBlackXPixelIndex)
{
const Pixel_T & color = image(firstNonBlackXPixelIndex-1, firstNonBlackYPixelIndex);
if (isBlack(color))
{
break;
}
}
// expand image to the top
for(; firstNonBlackYPixelIndex > 0; --firstNonBlackYPixelIndex)
{
const Pixel_T & color = image(firstNonBlackXPixelIndex, firstNonBlackYPixelIndex-1);
if (isBlack(color))
{
break;
}
}
*/
// Construct result
BlackBorder detectedBorder;
detectedBorder.unknown = firstNonBlackXPixelIndex == -1 || firstNonBlackYPixelIndex == -1;

2
include/blackborder/BlackBorderProcessor.h
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@ -73,8 +73,6 @@ namespace hyperion
/// @return True if the current border changed else false
///
bool updateBorder(const BlackBorder & newDetectedBorder);
bool updateBorder1(const BlackBorder & newDetectedBorder);
bool updateBorder2(const BlackBorder & newDetectedBorder);
/// The number of unknown-borders detected before it becomes the current border
const unsigned _unknownSwitchCnt;

17
libsrc/blackborder/BlackBorderProcessor.cpp
View File

@ -51,8 +51,7 @@ bool BlackBorderProcessor::updateBorder(const BlackBorder & newDetectedBorder)
if (newDetectedBorder.unknown)
{
// apply the unknown border if we consistently can't determine a border
// if (_consistentCnt == _unknownSwitchCnt)
if (_consistentCnt >= _unknownSwitchCnt)
if (_consistentCnt == _unknownSwitchCnt)
{
_currentBorder = newDetectedBorder;
borderChanged = true;
@ -61,8 +60,7 @@ bool BlackBorderProcessor::updateBorder(const BlackBorder & newDetectedBorder)
else
{
// apply the detected border if it has been detected consistently
// if (_currentBorder.unknown || _consistentCnt == _borderSwitchCnt)
if (_currentBorder.unknown || _consistentCnt >= _borderSwitchCnt)
if (_currentBorder.unknown || _consistentCnt == _borderSwitchCnt)
{
_currentBorder = newDetectedBorder;
borderChanged = true;
@ -70,17 +68,16 @@ bool BlackBorderProcessor::updateBorder(const BlackBorder & newDetectedBorder)
else
{
bool stable = (_consistentCnt >= 10) || (_inconsistentCnt >=30 );
//more then A consistent seems like a new size not only a short flicker
//more then B inconsistent seems like the image is changing a lot and we need to set smaller border
// apply smaller borders immediately
// if (newDetectedBorder.verticalSize < _currentBorder.verticalSize)
if ( (newDetectedBorder.verticalSize < _currentBorder.verticalSize) && (stable) )// almost immediatly - avoid switching for "abnormal" frames
//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)
if ( (newDetectedBorder.horizontalSize < _currentBorder.horizontalSize) && (stable) )
{
_currentBorder.horizontalSize = newDetectedBorder.horizontalSize;