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Make update speed independet from pixel color differences. #6

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Make update speed independet from pixel color differences. #6

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49 changes: 36 additions & 13 deletions Vision/SimpleBackgroundModelingDetector.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -93,16 +93,19 @@ public class SimpleBackgroundModelingDetector : IMotionDetector

// suppress noise
private bool _suppressNoise = true;
private bool _keepObjectEdges;
private bool _keepObjectEdges = false;

// threshold values
private int _differenceThreshold = 15;
private int _differenceThresholdNeg = -15;

// morphing speed, do an update step each "_framesPerBackgroundUpdate" frames:
private int _framesPerBackgroundUpdate = 2;
private int _framesCounter;
// morphing speed, number of steps required for full update (higher value is slower morphing):
private byte _framesUpdateSteps = 50; // 0 .. 255 where 0 is old behaviour.

private int _millisecondsPerBackgroundUpdate;
private int _millisecondsPerBackgroundUpdate = 0;
private int _millisecondsLeftUnprocessed;
private DateTime _lastTimeMeasurment;

Expand Down Expand Up @@ -388,7 +391,7 @@ public unsafe void ProcessFrame( UnmanagedImage videoFrame )
// pointers to background and current frames
byte* backFrame;
byte* currFrame;
int diff;
int diff, steps = _framesUpdateSteps;

// update background frame
if ( _millisecondsPerBackgroundUpdate == 0 )
Expand All @@ -401,16 +404,34 @@ public unsafe void ProcessFrame( UnmanagedImage videoFrame )
backFrame = (byte*) _backgroundFrame.ImageData.ToPointer( );
currFrame = (byte*) _motionFrame.ImageData.ToPointer( );

for ( int i = 0; i < _frameSize; i++, backFrame++, currFrame++ )
if ( steps == 0 ) // old behaviour
{
diff = *currFrame - *backFrame;
if ( diff > 0 )
for ( int i = 0; i < _frameSize; i++, backFrame++, currFrame++ )
{
( *backFrame )++;
diff = *currFrame - *backFrame;
if ( diff > 0 )
{
( *backFrame )++;
}
else if ( diff < 0 )
{
( *backFrame )--;
}
}
else if ( diff < 0 )
}
else
{
for ( int i = 0; i < _frameSize; i++, backFrame++, currFrame++ )
{
( *backFrame )--;
diff = *currFrame - *backFrame;
if ( diff > 0 )
{
( *backFrame ) += (byte)((steps - 1 + diff) / steps);
}
else if ( diff < 0 )
{
( *backFrame ) -= (byte)((steps - 1 - diff) / steps);
}
}
}
}
Expand Down Expand Up @@ -465,13 +486,15 @@ public unsafe void ProcessFrame( UnmanagedImage videoFrame )
if ( _suppressNoise )
{
// suppress noise and calculate motion amount
AForge.SystemTools.CopyUnmanagedMemory( _tempFrame.ImageData, _motionFrame.ImageData, _frameSize );
_erosionFilter.Apply( _tempFrame, _motionFrame );
_erosionFilter.Apply( _motionFrame, _tempFrame ); // src -> dst

if ( _keepObjectEdges )
{
AForge.SystemTools.CopyUnmanagedMemory( _tempFrame.ImageData, _motionFrame.ImageData, _frameSize );
_dilatationFilter.Apply( _tempFrame, _motionFrame );
_dilatationFilter.Apply( _tempFrame, _motionFrame ); // src -> dst
}
else
{
AForge.SystemTools.CopyUnmanagedMemory( _motionFrame.ImageData, _tempFrame.ImageData, _frameSize ); // dst <- src
}
}

Expand Down
51 changes: 37 additions & 14 deletions Vision/SimpleColorBackgroundModelingDetector.cs
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -87,15 +87,18 @@ public class SimpleColorBackgroundModelingDetector : IMotionDetector

// suppress noise
private bool _suppressNoise = true;
private bool _keepObjectEdges;
private bool _keepObjectEdges = false;

// threshold values
private int _differenceThreshold = 15;

// morphing speed, do an update step each "_framesPerBackgroundUpdate" frames:
private int _framesPerBackgroundUpdate = 2;
private int _framesCounter;
// morphing speed, number of steps required for full update (higher value is slower morphing):
private byte _framesUpdateSteps = 50; // 0 .. 255 where 0 is old behaviour.

private int _millisecondsPerBackgroundUpdate;
private int _millisecondsPerBackgroundUpdate = 0;
private int _millisecondsLeftUnprocessed;
private DateTime _lastTimeMeasurment;

Expand Down Expand Up @@ -379,7 +382,7 @@ public unsafe void ProcessFrame( UnmanagedImage videoFrame )
// pointers to background and current frames
byte* backFrame;
byte* currFrame;
int diff;
int diff, steps = _framesUpdateSteps;

// update background frame
if ( _millisecondsPerBackgroundUpdate == 0 )
Expand All @@ -391,17 +394,35 @@ public unsafe void ProcessFrame( UnmanagedImage videoFrame )

backFrame = (byte*) _backgroundFrame.ImageData.ToPointer( );
currFrame = (byte*) videoFrame.ImageData.ToPointer( );
for ( int i = 0; i < _frameSize; i++, backFrame++, currFrame++ )

if ( steps == 0 ) // old behaviour
{
diff = *currFrame - *backFrame;
if ( diff > 0 )
for ( int i = 0; i < _frameSize; i++, backFrame++, currFrame++ )
{
( *backFrame )++;
diff = *currFrame - *backFrame;
if ( diff > 0 )
{
( *backFrame )++;
}
else if ( diff < 0 )
{
( *backFrame )--;
}
}
else if ( diff < 0 )
}
else
{
for ( int i = 0; i < _frameSize; i++, backFrame++, currFrame++ )
{
( *backFrame )--;
diff = *currFrame - *backFrame;
if ( diff > 0 )
{
( *backFrame ) += (byte)((steps - 1 + diff) / steps);
}
else if ( diff < 0 )
{
( *backFrame ) -= (byte)((steps - 1 - diff) / steps);
}
}
}
}
Expand Down Expand Up @@ -471,13 +492,15 @@ public unsafe void ProcessFrame( UnmanagedImage videoFrame )
if ( _suppressNoise )
{
// suppress noise and calculate motion amount
AForge.SystemTools.CopyUnmanagedMemory( _tempFrame.ImageData, _motionFrame.ImageData, _motionSize );
_erosionFilter.Apply( _tempFrame, _motionFrame );
_erosionFilter.Apply(_motionFrame, _tempFrame); // src -> dst

if ( _keepObjectEdges )
{
AForge.SystemTools.CopyUnmanagedMemory( _tempFrame.ImageData, _motionFrame.ImageData, _motionSize );
_dilatationFilter.Apply( _tempFrame, _motionFrame );
_dilatationFilter.Apply( _tempFrame, _motionFrame ); // src -> dst
}
else
{
AForge.SystemTools.CopyUnmanagedMemory( _motionFrame.ImageData, _tempFrame.ImageData, _motionSize ); // dst <- src
}
}

Expand Down