/// <summary>
/// Calculates an average pixel value in HSV space for the given image format.
/// </summary>
/// <param name="image"> Image.</param>
/// <param name="pixelGetter">Pixel getter.</param>
void GetAveragePixelIntensity(Vuforia.Image image, GetPixelFromBuffer pixelGetter)
{
float avgH, avgS, avgV;
avgH = avgS = avgV = 0;
int bytesPerPixel = image.Stride / image.Width;
int numPixels = image.Width * image.Height;
for (int r = 0; r < NumSampleRows; ++r)
{
int y = Random.Range(0, image.Height);
for (int c = 0; c < NumSamplesPerRow; ++c)
{
int x = Random.Range(0, image.Width);
int i = y * image.Stride + x * bytesPerPixel;
Color pixel = pixelGetter(image.Pixels, i);
float h, s, v;
Color.RGBToHSV(pixel, out h, out s, out v);
avgH += h / numPixels;
avgS += s / numPixels;
avgV += v / numPixels;
}
}
lastIntensity = avgV;
lastColor = Color.HSVToRGB(avgH, avgS, avgV);
}
/// <summary>
/// attempts to setup the right image format, retrieve images from Vuforia, and pass them on
/// for processing.
/// </summary>
protected override void Loop()
{
if (ImageFormat != lastFormat)
{
while (ImageFormat != null && !CameraDevice.Instance.SetFrameFormat(ImageFormat.Value, true))
{
attemptFormats.Dequeue();
}
lastFormat = ImageFormat;
pixelGetter = null;
if (ImageFormat != null && PixelConverters.ContainsKey(ImageFormat.Value))
{
pixelGetter = PixelConverters[ImageFormat.Value];
}
}
if (ImageFormat != null)
{
try
{
var image = CameraDevice.Instance.GetCameraImage(ImageFormat.Value);
if (image != null)
{
imageAnalyzer(image, pixelGetter);
}
}
catch (Exception exp)
{
ScreenDebugger.Print(exp, "VuforiaImageAnalyzer");
}
}
}
