public override IObservable <Mat> Process(IObservable <Mat> source)
{
return(Observable.Create <Mat>(observer =>
{
var skipCount = 0;
var count = Count;
var skip = Skip.GetValueOrDefault(count);
var activeBuffers = new List <SampleBuffer>();
return source.Subscribe(input =>
{
try
{
// Update pending windows
activeBuffers.RemoveAll(buffer =>
{
buffer.Update(input, 0);
if (buffer.Completed)
{
// Window is ready, emit
observer.OnNext(buffer.Samples);
return true;
}
return false;
});
var index = 0;
while ((index + skipCount) < input.Cols)
{
// Create new window and reset skip counter
index += skipCount;
skipCount = skip;
var buffer = new SampleBuffer(input, count, index);
buffer.Update(input, index);
if (buffer.Completed)
{
// Window is ready, emit
observer.OnNext(buffer.Samples);
}
// Window is missing data, add to list
else
{
activeBuffers.Add(buffer);
}
}
// Remove remainder of input samples from skip counter
skipCount -= input.Cols - index;
}
catch (Exception ex)
{
observer.OnError(ex);
}
},
error => observer.OnError(error),
() => observer.OnCompleted());
}));
}
static SampleBuffer UpdateBuffer(SampleBuffer buffer, Mat source, int index, int delay, double threshold)
{
var samplesTaken = buffer.Update(source, index);
if (buffer.Completed && !buffer.Refined)
{
double min, max;
Point minLoc, maxLoc;
var waveform = buffer.Samples;
CV.MinMaxLoc(waveform, out min, out max, out minLoc, out maxLoc);
var offset = threshold > 0 ? maxLoc.X - delay : minLoc.X - delay;
if (offset > 0)
{
var offsetBuffer = new SampleBuffer(waveform, waveform.Cols, buffer.SampleIndex + offset);
offsetBuffer.Refined = true;
offsetBuffer.Update(waveform, offset);
offsetBuffer.Update(source, index + samplesTaken + offset);
return(offsetBuffer);
}
}
return(buffer);
}
public override IObservable <Mat> Process(IObservable <Tuple <Mat, Mat> > source)
{
return(Observable.Create <Mat>(observer =>
{
bool active = false;
var activeBuffers = new List <SampleBuffer>();
return source.Subscribe(input =>
{
try
{
var data = input.Item1;
var trigger = input.Item2;
// Update pending windows
activeBuffers.RemoveAll(buffer =>
{
buffer.Update(data, 0);
if (buffer.Completed)
{
// Window is ready, emit
observer.OnNext(buffer.Samples);
return true;
}
return false;
});
// Check if new triggers have arrived
var nonZero = CV.CountNonZero(trigger);
if (nonZero <= 0)
{
active = false;
}
else
{
var triggerBuffer = new byte[trigger.Cols];
var triggerHandle = GCHandle.Alloc(triggerBuffer, GCHandleType.Pinned);
using (var triggerHeader = new Mat(1, triggerBuffer.Length, Depth.U8, 1, triggerHandle.AddrOfPinnedObject()))
{
CV.Convert(trigger, triggerHeader);
triggerHandle.Free();
}
for (int i = 0; i < triggerBuffer.Length; i++)
{
var triggerHigh = triggerBuffer[i] > 0;
if (triggerHigh && !active)
{
var buffer = new SampleBuffer(data, Count, i);
buffer.Update(data, i);
if (buffer.Completed)
{
// Window is ready, emit
observer.OnNext(buffer.Samples);
}
// Window is missing data, add to list
else
{
activeBuffers.Add(buffer);
}
}
active = triggerHigh;
}
}
}
catch (Exception ex)
{
observer.OnError(ex);
}
},
error => observer.OnError(error),
() => observer.OnCompleted());
}));
}
public override IObservable <SpikeWaveformCollection> Process(IObservable <Mat> source)
{
return(Observable.Defer(() =>
{
byte[] triggerBuffer = null;
bool[] activeChannels = null;
int[] refractoryChannels = null;
SampleBuffer[] activeSpikes = null;
var ioff = 0L;
return source.Publish(ps => ps.Zip(delay.Process(ps), (input, delayed) =>
{
var spikes = new SpikeWaveformCollection(input.Size);
if (activeSpikes == null)
{
triggerBuffer = new byte[input.Cols];
activeChannels = new bool[input.Rows];
refractoryChannels = new int[input.Rows];
activeSpikes = new SampleBuffer[input.Rows];
}
var thresholdValues = Threshold ?? DefaultThreshold;
if (thresholdValues.Length == 0)
{
thresholdValues = DefaultThreshold;
}
for (int i = 0; i < activeSpikes.Length; i++)
{
using (var channel = input.GetRow(i))
using (var delayedChannel = delayed.GetRow(i))
{
var threshold = thresholdValues.Length > 1 ? thresholdValues[i] : thresholdValues[0];
if (activeSpikes[i] != null)
{
var buffer = activeSpikes[i];
buffer = UpdateBuffer(buffer, delayedChannel, 0, delay.Count, threshold);
activeSpikes[i] = buffer;
if (buffer.Completed)
{
spikes.Add(new SpikeWaveform
{
ChannelIndex = i,
SampleIndex = buffer.SampleIndex,
Waveform = buffer.Samples
});
activeSpikes[i] = null;
}
else
{
continue;
}
}
using (var triggerHeader = Mat.CreateMatHeader(triggerBuffer))
{
CV.Threshold(
channel,
triggerHeader,
threshold, 1,
threshold < 0 ? ThresholdTypes.BinaryInv : ThresholdTypes.Binary);
}
for (int j = 0; j < triggerBuffer.Length; j++)
{
var triggerHigh = triggerBuffer[j] > 0;
if (triggerHigh && !activeChannels[i] && refractoryChannels[i] == 0 && activeSpikes[i] == null)
{
var length = Length;
refractoryChannels[i] = length;
var buffer = new SampleBuffer(channel, length, j + ioff);
buffer.Refined |= WaveformRefinement == SpikeWaveformRefinement.None;
buffer = UpdateBuffer(buffer, delayedChannel, j, delay.Count, threshold);
if (buffer.Completed)
{
spikes.Add(new SpikeWaveform
{
ChannelIndex = i,
SampleIndex = buffer.SampleIndex,
Waveform = buffer.Samples
});
}
else
{
activeSpikes[i] = buffer;
}
}
activeChannels[i] = triggerHigh;
if (refractoryChannels[i] > 0)
{
refractoryChannels[i]--;
}
}
}
}
ioff += input.Cols;
return spikes;
}));
}));
}