using System.Collections.Generic; /* * 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. */ namespace com.google.zxing.multi { using BinaryBitmap = com.google.zxing.BinaryBitmap; using DecodeHintType = com.google.zxing.DecodeHintType; using NotFoundException = com.google.zxing.NotFoundException; using Reader = com.google.zxing.Reader; using ReaderException = com.google.zxing.ReaderException; using Result = com.google.zxing.Result; using ResultPoint = com.google.zxing.ResultPoint; /// ///

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 /// s are scanned, recursively.

/// ///

A caller may want to also employ 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.

/// ///

That is, instead of passing a a caller might pass /// {@code new ByQuadrantReader(reader)}.

/// /// @author Sean Owen ///
public sealed class GenericMultipleBarcodeReader : MultipleBarcodeReader { private const int MIN_DIMENSION_TO_RECUR = 100; private readonly Reader @delegate; public GenericMultipleBarcodeReader(Reader @delegate) { this.@delegate = @delegate; } //JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET: //ORIGINAL LINE: public com.google.zxing.Result[] decodeMultiple(com.google.zxing.BinaryBitmap image) throws com.google.zxing.NotFoundException public Result[] decodeMultiple(BinaryBitmap image) { return decodeMultiple(image, null); } //JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET: //ORIGINAL LINE: public com.google.zxing.Result[] decodeMultiple(com.google.zxing.BinaryBitmap image, java.util.Map hints) throws com.google.zxing.NotFoundException public Result[] decodeMultiple(BinaryBitmap image, IDictionary hints) { List results = new List(); doDecodeMultiple(image, hints, results, 0, 0); if (results.Count == 0) { throw NotFoundException.NotFoundInstance; } return results.ToArray(); } private void doDecodeMultiple(BinaryBitmap image, IDictionary hints, IList results, int xOffset, int yOffset) { Result result; try { result = @delegate.decode(image, hints); } catch (ReaderException re) { return; } bool alreadyFound = false; foreach (Result existingResult in results) { if (existingResult.Text.Equals(result.Text)) { alreadyFound = true; break; } } if (!alreadyFound) { 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; foreach (ResultPoint point in resultPoints) { 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) { doDecodeMultiple(image.crop(0, 0, (int) minX, height), hints, results, xOffset, yOffset); } // Decode above barcode if (minY > MIN_DIMENSION_TO_RECUR) { doDecodeMultiple(image.crop(0, 0, width, (int) minY), hints, results, xOffset, yOffset); } // Decode right of barcode if (maxX < width - MIN_DIMENSION_TO_RECUR) { 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) { 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; if (oldResultPoints == null) { return result; } 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); } } }