/// <summary>
/// Called every time a new frame shows up from the camera
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void provider_ImageTransaction(object sender, ImageReceivedEventArgs e)
{
if (stopping || e == null || e.PixelData == null)
{
return;
}
if (Monitor.TryEnter(this))
{
imgGPU.Scatter(e.PixelData);
if (calibrating)
{
// compute a running mean of each pixel
worker.Launch(RunningMean_Kernel, lp, e.Width, imgGPU.Ptr, meanImg.Ptr, numCalibrationSamples);
numCalibrationSamples++;
// compute the mean over the full mean image, using a reduction operation
addReduce.Reduce(meanImg.Ptr, scalarOutput.Ptr, numPixels);
var mean = scalarOutput.GatherScalar();
mean /= numPixels;
// update the correction factor for each pixel
worker.Launch(UpdateCorrectionFactor_Kernel, lp, e.Width, meanImg.Ptr, correctionFactor.Ptr, mean);
}
if (correctBrightness)
{
worker.Launch(ApplyCorrectionFactor_Kernel, lp, e.Width, correctionFactor.Ptr, imgGPU.Ptr);
imgGPU.Gather(e.PixelData);
}
img.Bytes = e.PixelData; // note: have to do this last, because if you set it earlier but then modify the bytes it won't update the image
// trigger a new frame event
OnFrameAvailable(new VideoFrame {
Image = img, ImageGPU = imgGPU, Timestamp = e.TimeStamp
});
Monitor.Exit(this);
}
}