public void Analyze(IImageProxy image)
{
var currentTime = DateTime.Now;
_frameTimestamps.Enqueue(currentTime);
while (_frameTimestamps.Count >= _frameRateWindow)
{
_frameTimestamps.Dequeue();
}
var timestampFirst = _frameTimestamps.First();
var timestampLast = _frameTimestamps.Dequeue();
var framePerSecond = 1.0 / ((timestampFirst - timestampLast).TotalMilliseconds) * 1000f;
var buffer = image.GetPlanes()[0].Buffer;
var data = buffer.ToByteArray();
var pixels = data !.Select(b => b & 0xFf)
.ToArray();
var luma = pixels.Average();
_lumaListener.OnFrameAnalyzed(luma);
image.Close();
}
// Analyzes an image to produce a result.
//
// <p>The caller is responsible for ensuring this analysis method can be executed quickly
// enough to prevent stalls in the image acquisition pipeline. Otherwise, newly available
// images will not be acquired and analyzed.
//
// <p>The image passed to this method becomes invalid after this method returns. The caller
// should not store external references to this image, as these references will become
// invalid.
//
// @param image image being analyzed VERY IMPORTANT: Analyzer method implementation must
// call image.close() on received images when finished using them. Otherwise, new images
// may not be received or the camera may stall, depending on back pressure setting.
//
public void Analyze(IImageProxy image)
{
// If there are no listeners attached, we don't need to perform analysis
if (listeners.Length == 0)
{
image.Close();
return;
}
// Keep track of frames analyzed
var currentTime = Java.Lang.JavaSystem.CurrentTimeMillis();
frameTimestamps.Enqueue(currentTime);
// Compute the FPS using a moving average
while (frameTimestamps.Count > frameRateWindow)
{
frameTimestamps.Dequeue();
}
var timestampFirst = frameTimestamps.First();
var timestampLast = frameTimestamps.Last();
framesPerSecond = 1.0 / ((timestampLast - timestampFirst) /
System.Math.Max(1, frameTimestamps.Count - 1)) * 1000.0;
if (++frameCounter % frameRateWindow == 0)
{
Log.Debug(Tag, "Frames per second: " + framesPerSecond.ToString("0.00"));
}
// Analysis could take an arbitrarily long amount of time
// Since we are running in a different thread, it won't stall other use cases
lastAnalyzedTimestamp = frameTimestamps.Last();
// Since format in ImageAnalysis is YUV, image.planes[0] contains the luminance plane
var buffer = image.GetPlanes()[0].Buffer;
// Extract image data from callback object
ToByteArray(buffer);
// Compute average luminance for the image
double luma = 0;
for (int i = 0; i < data.Length; i++)
{
luma += data[i];
}
luma /= data.Length;
// Call all listeners with new value
foreach (LumaListener item in listeners)
{
item(luma);
}
image.Close();
}
// Analyzes an image to produce a result.
//
// <p>The caller is responsible for ensuring this analysis method can be executed quickly
// enough to prevent stalls in the image acquisition pipeline. Otherwise, newly available
// images will not be acquired and analyzed.
//
// <p>The image passed to this method becomes invalid after this method returns. The caller
// should not store external references to this image, as these references will become
// invalid.
//
// @param image image being analyzed VERY IMPORTANT: Analyzer method implementation must
// call image.close() on received images when finished using them. Otherwise, new images
// may not be received or the camera may stall, depending on back pressure setting.
//
public void Analyze(IImageProxy image)
{
// If there are no listeners attached, we don't need to perform analysis
if (listeners.Length == 0)
{
image.Close();
return;
}
// Keep track of frames analyzed
var currentTime = Java.Lang.JavaSystem.CurrentTimeMillis();
frameTimestamps.Enqueue(currentTime);
// Compute the FPS using a moving average
while (frameTimestamps.Count > frameRateWindow)
{
frameTimestamps.Dequeue();
}
var timestampFirst = frameTimestamps.First();
var timestampLast = frameTimestamps.Last();
framesPerSecond = 1.0 / ((timestampLast - timestampFirst) /
System.Math.Max(1, frameTimestamps.Count)) * 1000.0;
// Analysis could take an arbitrarily long amount of time
// Since we are running in a different thread, it won't stall other use cases
lastAnalyzedTimestamp = frameTimestamps.Last();
// Since format in ImageAnalysis is YUV, image.planes[0] contains the luminance plane
var buffer = image.GetPlanes()[0].Buffer;
// Extract image data from callback object
var data = ToByteArray(buffer);
// Convert the data into an array of pixel values ranging 0-255
var pixels = data.Select(x => (int)x & 0xFF).ToArray();
// Compute average luminance for the image
var luma = pixels.Average();
// Call all listeners with new value
foreach (LumaListener item in listeners)
{
item(luma);
}
image.Close();
}
public void Analyze(IImageProxy image)
{
var buffer = image.GetPlanes()[0].Buffer;
var data = ToByteArray(buffer);
var pixels = data.ToList();
pixels.ForEach(x => x = (byte)((int)x & 0xFF));
var luma = pixels.Average(x => x);
//Log.Debug(TAG, $"Average luminosity: {luma}");
image.Close();
lumaListerner.Invoke(luma);
}