zxing/csharp/multi/GenericMultipleBarcodeReader.cs
srowen d4efd44fb0 New C# port from Suraj Supekar
git-svn-id: https://zxing.googlecode.com/svn/trunk@1202 59b500cc-1b3d-0410-9834-0bbf25fbcc57
2010-02-05 19:52:53 +00:00

175 lines
6.3 KiB
C#
Executable file

/*
* Copyright 2009 ZXing authors
*
* 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.
*/
using System;
using Reader = com.google.zxing.Reader;
using Result = com.google.zxing.Result;
using BinaryBitmap = com.google.zxing.BinaryBitmap;
using ReaderException = com.google.zxing.ReaderException;
using ResultPoint = com.google.zxing.ResultPoint;
namespace com.google.zxing.multi
{
/// <summary> <p>Attempts to locate multiple barcodes in an image by repeatedly decoding portion of the image.
/// After one barcode is found, the areas left, above, right and below the barcode's
/// {@link com.google.zxing.ResultPoint}s are scanned, recursively.</p>
///
/// <p>A caller may want to also employ {@link ByQuadrantReader} when attempting to find multiple
/// 2D barcodes, like QR Codes, in an image, where the presence of multiple barcodes might prevent
/// detecting any one of them.</p>
///
/// <p>That is, instead of passing a {@link Reader} a caller might pass
/// <code>new ByQuadrantReader(reader)</code>.</p>
///
/// </summary>
/// <author> Sean Owen
/// </author>
/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source
/// </author>
public sealed class GenericMultipleBarcodeReader : MultipleBarcodeReader
{
private const int MIN_DIMENSION_TO_RECUR = 30;
//UPGRADE_NOTE: Final was removed from the declaration of 'delegate '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
private Reader delegate_Renamed;
public GenericMultipleBarcodeReader(Reader delegate_Renamed)
{
this.delegate_Renamed = delegate_Renamed;
}
public Result[] decodeMultiple(BinaryBitmap image)
{
return decodeMultiple(image, null);
}
public Result[] decodeMultiple(BinaryBitmap image, System.Collections.Hashtable hints)
{
System.Collections.ArrayList results = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
doDecodeMultiple(image, hints, results, 0, 0);
if ((results.Count == 0))
{
throw ReaderException.Instance;
}
int numResults = results.Count;
Result[] resultArray = new Result[numResults];
for (int i = 0; i < numResults; i++)
{
resultArray[i] = (Result) results[i];
}
return resultArray;
}
private void doDecodeMultiple(BinaryBitmap image, System.Collections.Hashtable hints, System.Collections.ArrayList results, int xOffset, int yOffset)
{
Result result;
try
{
result = delegate_Renamed.decode(image, hints);
}
catch (ReaderException re)
{
return ;
}
bool alreadyFound = false;
for (int i = 0; i < results.Count; i++)
{
Result existingResult = (Result) results[i];
if (existingResult.Text.Equals(result.Text))
{
alreadyFound = true;
break;
}
}
if (alreadyFound)
{
return ;
}
results.Add(translateResultPoints(result, xOffset, yOffset));
ResultPoint[] resultPoints = result.ResultPoints;
if (resultPoints == null || resultPoints.Length == 0)
{
return ;
}
int width = image.Width;
int height = image.Height;
float minX = width;
float minY = height;
float maxX = 0.0f;
float maxY = 0.0f;
for (int i = 0; i < resultPoints.Length; i++)
{
ResultPoint point = resultPoints[i];
float x = point.X;
float y = point.Y;
if (x < minX)
{
minX = x;
}
if (y < minY)
{
minY = y;
}
if (x > maxX)
{
maxX = x;
}
if (y > maxY)
{
maxY = y;
}
}
// Decode left of barcode
if (minX > MIN_DIMENSION_TO_RECUR)
{
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
doDecodeMultiple(image.crop(0, 0, (int) minX, height), hints, results, xOffset, yOffset);
}
// Decode above barcode
if (minY > MIN_DIMENSION_TO_RECUR)
{
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
doDecodeMultiple(image.crop(0, 0, width, (int) minY), hints, results, xOffset, yOffset);
}
// Decode right of barcode
if (maxX < width - MIN_DIMENSION_TO_RECUR)
{
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
doDecodeMultiple(image.crop((int) maxX, 0, width - (int) maxX, height), hints, results, xOffset + (int) maxX, yOffset);
}
// Decode below barcode
if (maxY < height - MIN_DIMENSION_TO_RECUR)
{
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
doDecodeMultiple(image.crop(0, (int) maxY, width, height - (int) maxY), hints, results, xOffset, yOffset + (int) maxY);
}
}
private static Result translateResultPoints(Result result, int xOffset, int yOffset)
{
ResultPoint[] oldResultPoints = result.ResultPoints;
ResultPoint[] newResultPoints = new ResultPoint[oldResultPoints.Length];
for (int i = 0; i < oldResultPoints.Length; i++)
{
ResultPoint oldPoint = oldResultPoints[i];
newResultPoints[i] = new ResultPoint(oldPoint.X + xOffset, oldPoint.Y + yOffset);
}
return new Result(result.Text, result.RawBytes, newResultPoints, result.BarcodeFormat);
}
}
}