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Barcode errorcheck #104

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9061095
Update BarcodeAnalyzer.cs
varuncogg Oct 31, 2024
7e9a8bf
Update BarcodeAnalyzer.cs
varuncogg Oct 31, 2024
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34 changes: 32 additions & 2 deletions BarcodeScanning.Native.Maui/Platform/Android/BarcodeAnalyzer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,9 +20,12 @@ internal class BarcodeAnalyzer : Java.Lang.Object, ImageAnalysis.IAnalyzer, IOnS
private CoordinateTransform _coordinateTransform;
private bool _processInverted;
private IImageProxy _proxy;
private String lastDetectedBarcode = "";
private int consecutiveCount = 0;

private readonly HashSet<BarcodeResult> _barcodeResults;
private readonly CameraManager _cameraManager;
private TaskCompletionSource<BarcodeResult> barcodeCompletionsource= new TaskCompletionSource<BarcodeResult>();

internal BarcodeAnalyzer(CameraManager cameraManager)
{
Expand Down Expand Up @@ -87,6 +90,29 @@ public void OnSuccess(Java.Lang.Object result)
{
if (!barcode.PreviewBoundingBox.Contains(previewCenter))
_barcodeResults.Remove(barcode);
else
{
if (barcode != null)
{
//Iterates atleast 3 times to check it the code from subsequent frame are same - Streaming camera source -keeps getting incorrect results
if (barcode.DisplayValue.Equals(lastDetectedBarcode))
{
consecutiveCount++;
if (consecutiveCount >= 3)
{
Console.WriteLine("bar code recognized");
barcodeCompletionSource.SetResult(barcode);
// Call your .NET MAUI backend with the barcode value
}
}
else
{
barcodeCompletionSource = new TaskCompletionSource<BarcodeResult>();
lastDetectedBarcode = barcode.DisplayValue;
consecutiveCount = 1;
}
}
}
}
}

Expand All @@ -101,7 +127,11 @@ public void OnSuccess(Java.Lang.Object result)
}
}

_cameraManager?.CameraView?.DetectionFinished(_barcodeResults);
MainThread.BeginInvokeOnMainThread( async()=>{
var recognizedbarcodeResult = await barcodeCompletionSource.Task;
if(!string.IsNullOrEmpty(recognizedbarcodeResult?.DisplayValue))
_cameraManager?.CameraView?.DetectionFinished(new HashSet<BarcodeResult>(){recognizedbarcodeResult});
});
}
}
catch (Exception)
Expand Down Expand Up @@ -153,4 +183,4 @@ protected override void Dispose(bool disposing)

base.Dispose(disposing);
}
}
}
35 changes: 32 additions & 3 deletions BarcodeScanning.Native.Maui/Platform/MaciOS/BarcodeAnalyzer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,9 @@ internal class BarcodeAnalyzer : AVCaptureVideoDataOutputSampleBufferDelegate
private readonly CameraManager _cameraManager;
private readonly VNDetectBarcodesRequest _detectBarcodesRequest;
private readonly VNSequenceRequestHandler _sequenceRequestHandler;

private int consecutiveCount =0;
private TaskCompletionSource<BarcodeResult> barcodeCompletionSource= new TaskCompletionSource<BarcodeResult>();
private string lastDetectedBarcode = "";
internal BarcodeAnalyzer(CameraManager cameraManager)
{
_barcodeResults = [];
Expand Down Expand Up @@ -59,6 +61,29 @@ public override void DidOutputSampleBuffer(AVCaptureOutput captureOutput, CMSamp
{
if (!barcode.PreviewBoundingBox.Contains(previewCenter))
_barcodeResults.Remove(barcode);
else
{
if (barcode != null)
{
if (barcode.DisplayValue.Equals(lastDetectedBarcode))
{
consecutiveCount++;
//Checksum added to keep the barcode more error free- especially in streaming source
if (consecutiveCount >= 3)
{
Console.WriteLine("bar code recognized");
barcodeCompletionSource.SetResult(barcode);
// Call your .NET MAUI backend with the barcode value
}
}
else
{
barcodeCompletionSource = new TaskCompletionSource<BarcodeResult>();
lastDetectedBarcode = barcode.DisplayValue;
consecutiveCount = 1;
}
}
}
}
}

Expand All @@ -73,7 +98,11 @@ public override void DidOutputSampleBuffer(AVCaptureOutput captureOutput, CMSamp
}
}

_cameraManager.CameraView.DetectionFinished(_barcodeResults);
MainThread.BeginInvokeOnMainThread( async()=>{
var recognizedbarcodeResult = await barcodeCompletionSource.Task;
if(!string.IsNullOrEmpty(recognizedbarcodeResult?.DisplayValue))
_cameraManager?.CameraView?.DetectionFinished(new HashSet<BarcodeResult>(){recognizedbarcodeResult});
});
}
catch (Exception ex)
{
Expand All @@ -100,4 +129,4 @@ protected override void Dispose(bool disposing)

base.Dispose(disposing);
}
}
}