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@GiampaoloGabba
GiampaoloGabba committed Mar 21, 2019
1 parent 382057d commit 4ff4313
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Showing 2 changed files with 531 additions and 60 deletions.
270 changes: 241 additions & 29 deletions Source/ZXing.Net.Mobile.Android/CameraAccess/CameraAnalyzer.cs
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@@ -1,19 +1,60 @@
using System;
/*
* Copyright 2018 ZXing/Redth - https://github.com/Redth/ZXing.Net.Mobile
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Edited by VK, Apacheta Corp 11/14/2018.
* http://www.apacheta.com/
*
*/

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Android.Views;
using ApxLabs.FastAndroidCamera;
using Android.Graphics;
using Android.Content;
using Android.Util;

namespace ZXing.Mobile.CameraAccess
{
public class CameraAnalyzer
{
/// <summary>
///START - Scanning Improvement, VK 11/14/2018
/// </summary>
private const int MIN_FRAME_WIDTH = 240;
private const int MIN_FRAME_HEIGHT = 240;
private const int MAX_FRAME_WIDTH = 640; // = 5/8 * 1920
private const int MAX_FRAME_HEIGHT = 480; // = 5/8 * 1080
/// <summary>
/// END - Scanning Improvement, VK 11/14/2018
/// </summary>
///

private readonly CameraController _cameraController;
private readonly CameraEventsListener _cameraEventListener;
private int _screenHeight = -1;
private int _screenWidth = -1;
private Task _processingTask;
private DateTime _lastPreviewAnalysis = DateTime.UtcNow;
private bool _wasScanned;
IScannerSessionHost _scannerHost;

private Rect framingRectInPreview;
private Rect framingRect;
private IWindowManager manager;
private bool _cameraSetup;

public CameraAnalyzer(SurfaceView surfaceView, IScannerSessionHost scannerHost)
Expand All @@ -22,6 +63,14 @@ public CameraAnalyzer(SurfaceView surfaceView, IScannerSessionHost scannerHost)
_cameraEventListener = new CameraEventsListener();
_cameraController = new CameraController(surfaceView, _cameraEventListener, scannerHost);
Torch = new Torch(_cameraController, surfaceView.Context);
try
{
manager = (surfaceView.Context as ZxingActivity)?.WindowManager;
}
catch (Exception ex)
{
Log.Debug(MobileBarcodeScanner.TAG, "Error occured while getting window manager : " + ex.ToString());
}
}

public event EventHandler<Result> BarcodeFound;
Expand Down Expand Up @@ -66,6 +115,15 @@ public void AutoFocus()
_cameraController.AutoFocus();
}

/// <summary>
///Scanning Improvement, VK 10/2018
///Removed this method for now.
/// </summary>
//public void LowLightMode(bool on)
//{
// _cameraController.LowLightMode(on);
//}

public void AutoFocus(int x, int y)
{
_cameraController.AutoFocus(x, y);
Expand All @@ -74,31 +132,39 @@ public void AutoFocus(int x, int y)
public void RefreshCamera()
{
//only refresh the camera if it is actually setup
if(_cameraSetup)
if (_cameraSetup)
_cameraController.RefreshCamera();
}

private bool Valid_ScreenResolution
{
get
{
return _screenHeight > 0 && _screenWidth > 0;
}
}

private bool CanAnalyzeFrame
{
get
{
if (!IsAnalyzing)
return false;
if (!IsAnalyzing)
return false;

//Check and see if we're still processing a previous frame
// todo: check if we can run as many as possible or mby run two analyzers at once (Vision + ZXing)
if (_processingTask != null && !_processingTask.IsCompleted)
return false;

var elapsedTimeMs = (DateTime.UtcNow - _lastPreviewAnalysis).TotalMilliseconds;
if (elapsedTimeMs < _scannerHost.ScanningOptions.DelayBetweenAnalyzingFrames)
return false;
// Delay a minimum between scans
if (_wasScanned && elapsedTimeMs < _scannerHost.ScanningOptions.DelayBetweenContinuousScans)
return false;
return true;
if (elapsedTimeMs < _scannerHost.ScanningOptions.DelayBetweenAnalyzingFrames)
return false;

// Delay a minimum between scans
if (_wasScanned && elapsedTimeMs < _scannerHost.ScanningOptions.DelayBetweenContinuousScans)
return false;

return true;
}
}

Expand All @@ -110,18 +176,21 @@ private void HandleOnPreviewFrameReady(object sender, FastJavaByteArray fastArra
_wasScanned = false;
_lastPreviewAnalysis = DateTime.UtcNow;

_processingTask = Task.Run(() =>
{
try
{
DecodeFrame(fastArray);
} catch (Exception ex) {
Console.WriteLine(ex);
}
}).ContinueWith(task =>
_processingTask = Task.Run(() =>
{
try
{
Log.Debug(MobileBarcodeScanner.TAG, "Preview Analyzing.");
DecodeFrame(fastArray);
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}).ContinueWith(task =>
{
if (task.IsFaulted)
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "DecodeFrame exception occurs");
Log.Debug(MobileBarcodeScanner.TAG, "DecodeFrame exception occurs");
}, TaskContinuationOptions.OnlyOnFaulted);
}

Expand Down Expand Up @@ -150,7 +219,28 @@ private void DecodeFrame(FastJavaByteArray fastArray)
ZXing.Result result = null;
var start = PerformanceCounter.Start();

LuminanceSource fast = new FastJavaByteArrayYUVLuminanceSource(fastArray, width, height, 0, 0, width, height); // _area.Left, _area.Top, _area.Width, _area.Height);
/// <summary>
///START - Scanning Improvement, VK Apacheta Corp 11/14/2018
///Added a new frame to get the center part of the captured image.
///To create a FastJavaByteArray from the cropped captured frame and use it to decode the barcode.
///To decrease the processing time drastically for higher resolution cameras.
/// </summary>
var frame_width = width * 3 / 5;
var frame_height = height * 3 / 5;
var frame_left = width * 1 / 5;
var frame_top = height * 1 / 5;

LuminanceSource fast = new FastJavaByteArrayYUVLuminanceSource(fastArray, width, height,
//framingRectPreview?.Width() ?? width,
// framingRectPreview?.Height() ?? height,
frame_left,
frame_top,
frame_width,
frame_height); // _area.Left, _area.Top, _area.Width, _area.Height);

/// <summary>
///END - Scanning Improvement, VK Apacheta Corp 11/14/2018
/// </summary>
if (rotate)
fast = fast.rotateCounterClockwise();

Expand All @@ -160,17 +250,139 @@ private void DecodeFrame(FastJavaByteArray fastArray)
fastArray = null;

PerformanceCounter.Stop(start,
"Decode Time: {0} ms (width: " + width + ", height: " + height + ", degrees: " + cDegrees + ", rotate: " +
rotate + ")");
$"width: {width}, height: {height}, frame_top :{frame_top}, frame_left: {frame_left}, frame_width: {frame_width}, frame_height: {frame_height}, degrees: {cDegrees}, rotate: {rotate}; " + "Decode Time: {0} ms");

if (result != null)
{
Android.Util.Log.Debug(MobileBarcodeScanner.TAG, "Barcode Found");
Log.Debug(MobileBarcodeScanner.TAG, "Barcode Found");

_wasScanned = true;
BarcodeFound?.Invoke(this, result);
return;
}
}


/// <summary>
///Scanning Improvement, VK 10/2018
/// </summary>
private Rect GetFramingRectInPreview()
{
if (framingRectInPreview == null)
{
//if (!Valid_ScreenResolution)
// GetScreenResolution();
var cameraParameters = _cameraController?.Camera?.GetParameters();
var width = cameraParameters.PreviewSize.Width;
var height = cameraParameters.PreviewSize.Height;
if (cameraParameters == null)//|| !Valid_ScreenResolution)
{
// Called early, before init even finished
return null;
}

var framingRect = GetFramingRect(width, height);
if (framingRect == null)
{
return null;
}

var rect = new Rect(framingRect);
//var cameraParameters = _cameraController?.Camera?.GetParameters();
//var width = cameraParameters.PreviewSize.Width;
//var height = cameraParameters.PreviewSize.Height;


//rect.Left = rect.Left * width / _screenWidth;
//rect.Right = rect.Right * width / _screenHeight;
//rect.Top = rect.Top * height / _screenWidth;
//rect.Bottom = rect.Bottom * height / _screenHeight;
framingRectInPreview = rect;
Log.Debug(MobileBarcodeScanner.TAG, $"preview resolution: w={width}; h={height}; _screenWidth ={_screenWidth}; _screenHeight={_screenHeight}; framingRect={framingRect?.ToString()}");
}

Log.Debug(MobileBarcodeScanner.TAG, $"Calculated preview framing rect: {framingRectInPreview?.FlattenToString()}");
return framingRectInPreview;
}

/// <summary>
///Scanning Improvement, VK 10/2018
/// </summary>
public Rect GetFramingRect(int _width, int _height)
{
if (framingRect == null)
{
if (_cameraController == null)
{
return null;
}

if (!(_width > 0 && _height > 0))//Valid_ScreenResolution)
{
// Called early, before init even finished
return null;
}

int width = findDesiredDimensionInRange(_width, MIN_FRAME_WIDTH, MAX_FRAME_WIDTH);
int height = findDesiredDimensionInRange(_height, MIN_FRAME_HEIGHT, MAX_FRAME_HEIGHT);

int leftOffset = (_width - width) / 2;
int topOffset = (_height - height) / 2;
framingRect = new Rect(leftOffset, topOffset, width, height);
Log.Debug(MobileBarcodeScanner.TAG, $"Calculated framing rect: {framingRect?.FlattenToString()}; screenWidth: {_screenWidth}; screenHeight: {_screenHeight}");
}

return framingRect;
}

/// <summary>
///Scanning Improvement, VK 10/2018
/// </summary>
private void GetScreenResolution()
{
var screenResolution = new DisplayMetrics();
try
{
if (manager == null)
{
Log.Debug(MobileBarcodeScanner.TAG, $"Window manager is null.");
}

Display display = manager?.DefaultDisplay;
if (display == null)
{
Log.Debug(MobileBarcodeScanner.TAG, $"Default display is null.");
}
else
{

display?.GetMetrics(screenResolution);
_screenWidth = screenResolution.WidthPixels;
_screenHeight = screenResolution.HeightPixels;
}
Log.Debug(MobileBarcodeScanner.TAG, $"Screen Display Rect- Width = {_screenWidth}; Height = {_screenHeight} ");
}
catch (Exception ex)
{
Log.Debug(MobileBarcodeScanner.TAG, "Error occured while getting screen resolution : " + ex.ToString());
}
}

/// <summary>
///Scanning Improvement, VK 10/2018
/// </summary>
private int findDesiredDimensionInRange(int resolution, int hardMin, int hardMax)
{
int dim = 5 * resolution / 8; // Target 5/8 of each dimension
if (dim < hardMin)
{
return hardMin;
}
if (dim > hardMax)
{
return hardMax;
}
return dim;
}
}
}
}

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