--- /dev/null
+/*\r
+* Copyright 2007 ZXing authors\r
+*\r
+* Licensed under the Apache License, Version 2.0 (the "License");\r
+* you may not use this file except in compliance with the License.\r
+* You may obtain a copy of the License at\r
+*\r
+* http://www.apache.org/licenses/LICENSE-2.0\r
+*\r
+* Unless required by applicable law or agreed to in writing, software\r
+* distributed under the License is distributed on an "AS IS" BASIS,\r
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+* See the License for the specific language governing permissions and\r
+* limitations under the License.\r
+*/\r
+using System;\r
+using BarcodeFormat = com.google.zxing.BarcodeFormat;\r
+using DecodeHintType = com.google.zxing.DecodeHintType;\r
+using BinaryBitmap = com.google.zxing.BinaryBitmap;\r
+using Reader = com.google.zxing.Reader;\r
+using ReaderException = com.google.zxing.ReaderException;\r
+using Result = com.google.zxing.Result;\r
+using ResultPoint = com.google.zxing.ResultPoint;\r
+using ResultMetadataType = com.google.zxing.ResultMetadataType;\r
+using BitMatrix = com.google.zxing.common.BitMatrix;\r
+using DecoderResult = com.google.zxing.common.DecoderResult;\r
+using DetectorResult = com.google.zxing.common.DetectorResult;\r
+using Decoder = com.google.zxing.datamatrix.decoder.Decoder;\r
+using Detector = com.google.zxing.datamatrix.detector.Detector;\r
+namespace com.google.zxing.datamatrix\r
+{\r
+ \r
+ /// <summary> This implementation can detect and decode Data Matrix codes in an image.\r
+ /// \r
+ /// </summary>\r
+ /// <author> bbrown@google.com (Brian Brown)\r
+ /// </author>\r
+ /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source \r
+ /// </author>\r
+ public sealed class DataMatrixReader : Reader\r
+ {\r
+ \r
+ //UPGRADE_NOTE: Final was removed from the declaration of 'NO_POINTS '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"\r
+ private static readonly ResultPoint[] NO_POINTS = new ResultPoint[0];\r
+ \r
+ //UPGRADE_NOTE: Final was removed from the declaration of 'decoder '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"\r
+ private Decoder decoder = new Decoder();\r
+ \r
+ /// <summary> Locates and decodes a Data Matrix code in an image.\r
+ /// \r
+ /// </summary>\r
+ /// <returns> a String representing the content encoded by the Data Matrix code\r
+ /// </returns>\r
+ /// <throws> ReaderException if a Data Matrix code cannot be found, or cannot be decoded </throws>\r
+ public Result decode(BinaryBitmap image)\r
+ {\r
+ return decode(image, null);\r
+ }\r
+ \r
+ public Result decode(BinaryBitmap image, System.Collections.Hashtable hints)\r
+ {\r
+ DecoderResult decoderResult;\r
+ ResultPoint[] points;\r
+ if (hints != null && hints.ContainsKey(DecodeHintType.PURE_BARCODE))\r
+ {\r
+ BitMatrix bits = extractPureBits(image.BlackMatrix);\r
+ decoderResult = decoder.decode(bits);\r
+ points = NO_POINTS;\r
+ }\r
+ else\r
+ {\r
+ DetectorResult detectorResult = new Detector(image.BlackMatrix).detect();\r
+ decoderResult = decoder.decode(detectorResult.Bits);\r
+ points = detectorResult.Points;\r
+ }\r
+ Result result = new Result(decoderResult.Text, decoderResult.RawBytes, points, BarcodeFormat.DATAMATRIX);\r
+ if (decoderResult.ByteSegments != null)\r
+ {\r
+ result.putMetadata(ResultMetadataType.BYTE_SEGMENTS, decoderResult.ByteSegments);\r
+ }\r
+ if (decoderResult.ECLevel != null)\r
+ {\r
+ result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, decoderResult.ECLevel.ToString());\r
+ }\r
+ return result;\r
+ }\r
+ \r
+ /// <summary> This method detects a Data Matrix code in a "pure" image -- that is, pure monochrome image\r
+ /// which contains only an unrotated, unskewed, image of a Data Matrix code, with some white border\r
+ /// around it. This is a specialized method that works exceptionally fast in this special\r
+ /// case.\r
+ /// </summary>\r
+ private static BitMatrix extractPureBits(BitMatrix image)\r
+ {\r
+ // Now need to determine module size in pixels\r
+ \r
+ int height = image.Height;\r
+ int width = image.Width;\r
+ int minDimension = System.Math.Min(height, width);\r
+ \r
+ // First, skip white border by tracking diagonally from the top left down and to the right:\r
+ int borderWidth = 0;\r
+ while (borderWidth < minDimension && !image.get_Renamed(borderWidth, borderWidth))\r
+ {\r
+ borderWidth++;\r
+ }\r
+ if (borderWidth == minDimension)\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ \r
+ // And then keep tracking across the top-left black module to determine module size\r
+ int moduleEnd = borderWidth + 1;\r
+ while (moduleEnd < width && image.get_Renamed(moduleEnd, borderWidth))\r
+ {\r
+ moduleEnd++;\r
+ }\r
+ if (moduleEnd == width)\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ \r
+ int moduleSize = moduleEnd - borderWidth;\r
+ \r
+ // And now find where the bottommost black module on the first column ends\r
+ int columnEndOfSymbol = height - 1;\r
+ while (columnEndOfSymbol >= 0 && !image.get_Renamed(borderWidth, columnEndOfSymbol))\r
+ {\r
+ columnEndOfSymbol--;\r
+ }\r
+ if (columnEndOfSymbol < 0)\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ columnEndOfSymbol++;\r
+ \r
+ // Make sure width of barcode is a multiple of module size\r
+ if ((columnEndOfSymbol - borderWidth) % moduleSize != 0)\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ int dimension = (columnEndOfSymbol - borderWidth) / moduleSize;\r
+ \r
+ // Push in the "border" by half the module width so that we start\r
+ // sampling in the middle of the module. Just in case the image is a\r
+ // little off, this will help recover.\r
+ borderWidth += (moduleSize >> 1);\r
+ \r
+ int sampleDimension = borderWidth + (dimension - 1) * moduleSize;\r
+ if (sampleDimension >= width || sampleDimension >= height)\r
+ {\r
+ throw ReaderException.Instance;\r
+ }\r
+ \r
+ // Now just read off the bits\r
+ BitMatrix bits = new BitMatrix(dimension);\r
+ for (int i = 0; i < dimension; i++)\r
+ {\r
+ int iOffset = borderWidth + i * moduleSize;\r
+ for (int j = 0; j < dimension; j++)\r
+ {\r
+ if (image.get_Renamed(borderWidth + j * moduleSize, iOffset))\r
+ {\r
+ bits.set_Renamed(j, i);\r
+ }\r
+ }\r
+ }\r
+ return bits;\r
+ }\r
+ }\r
+}
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projects / zxing.git / blobdiff