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363 lines
14 KiB
C#
363 lines
14 KiB
C#
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// /*
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// * Copyright 2009 ZXing authors
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// *
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// * Licensed under the Apache License, Version 2.0 (the "License");
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// * you may not use this file except in compliance with the License.
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// * You may obtain a copy of the License at
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// *
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// * http://www.apache.org/licenses/LICENSE-2.0
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// *
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// * Unless required by applicable law or agreed to in writing, software
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// * distributed under the License is distributed on an "AS IS" BASIS,
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// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// * See the License for the specific language governing permissions and
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// * limitations under the License.
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// */
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using ZXing.Common;
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namespace ZXing.PDF417.Internal
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{
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/// <summary>
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/// Represents a Column in the Detection Result
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/// </summary>
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/// <author>Guenther Grau (Java Core)</author>
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/// <author>Stephen Furlani (C# Port)</author>
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public sealed class DetectionResultRowIndicatorColumn : DetectionResultColumn
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{
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/// <summary>
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/// Gets or sets a value indicating whether this instance is the left indicator
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/// </summary>
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/// <value><c>true</c> if this instance is left; otherwise, <c>false</c>.</value>
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public bool IsLeft { get; set; }
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/// <summary>
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/// Initializes a new instance of the <see cref="ZXing.PDF417.Internal.DetectionResultRowIndicatorColumn"/> class.
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/// </summary>
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/// <param name="box">Box.</param>
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/// <param name="isLeft">If set to <c>true</c> is left.</param>
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public DetectionResultRowIndicatorColumn(BoundingBox box, bool isLeft) : base (box)
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{
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this.IsLeft = isLeft;
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this.Codewords = new Codeword[box.MaxY - box.MinY + 1];
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}
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/// <summary>
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/// Sets the Row Numbers as Inidicator Columns
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/// </summary>
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public void SetRowNumbers()
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{
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foreach (var cw in Codewords)
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{
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if (cw != null)
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{
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cw.SetRowNumberAsRowIndicatorColumn();
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}
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}
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// (from item in items where item != null do item.SomeMethod())
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}
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/// <summary>
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/// TODO implement properly
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/// TODO maybe we should add missing codewords to store the correct row number to make
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/// finding row numbers for other columns easier
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/// use row height count to make detection of invalid row numbers more reliable
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/// </summary>
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/// <returns>The indicator column row numbers.</returns>
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/// <param name="metadata">Metadata.</param>
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public int AdjustCompleteIndicatorColumnRowNumbers(BarcodeMetadata metadata)
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{
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SetRowNumbers(); // Assign this as an indicator column
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RemoveIncorrectCodewords(metadata);
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ResultPoint top = IsLeft ? Box.TopLeft : Box.TopRight;
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ResultPoint bottom = IsLeft ? Box.BottomLeft : Box.BottomRight;
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int firstRow = IndexForRow((int)top.Y);
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int lastRow = IndexForRow((int)bottom.Y);
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// We need to be careful using the average row height.
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// Barcode could be skewed so that we have smaller and taller rows
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float averageRowHeight = (lastRow - firstRow) / (float)metadata.RowCount;
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// initialize loop
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int barcodeRow = -1;
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int maxRowHeight = 1;
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int currentRowHeight = 0;
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for (int codewordRow = firstRow; codewordRow < lastRow; codewordRow++)
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{
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var codeword = Codewords[codewordRow];
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if (codeword == null)
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{
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continue;
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}
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// float expectedRowNumber = (codewordsRow - firstRow) / averageRowHeight;
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// if (Math.abs(codeword.getRowNumber() - expectedRowNumber) > 2) {
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// SimpleLog.log(LEVEL.WARNING,
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// "Removing codeword, rowNumberSkew too high, codeword[" + codewordsRow + "]: Expected Row: " +
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// expectedRowNumber + ", RealRow: " + codeword.getRowNumber() + ", value: " + codeword.getValue());
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// codewords[codewordsRow] = null;
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// }
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int rowDifference = codeword.RowNumber - barcodeRow;
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// TODO improve handling with case where first row indicator doesn't start with 0
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if (rowDifference == 0)
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{
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currentRowHeight ++;
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} else if (rowDifference == 1)
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{
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maxRowHeight = Math.Max(maxRowHeight, currentRowHeight);
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currentRowHeight = 1;
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barcodeRow = codeword.RowNumber;
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} else if (rowDifference < 0)
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{
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Codewords[codewordRow] = null;
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} else if (codeword.RowNumber >= metadata.RowCount)
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{
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Codewords[codewordRow] = null;
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} else if (rowDifference > codewordRow)
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{
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Codewords[codewordRow] = null;
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} else
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{
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int checkedRows;
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if (maxRowHeight > 2)
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{
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checkedRows = (maxRowHeight - 2) * rowDifference;
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} else
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{
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checkedRows = rowDifference;
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}
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bool closePreviousCodewordFound = checkedRows > codewordRow;
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for (int i = 1; i <= checkedRows && !closePreviousCodewordFound; i++)
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{
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closePreviousCodewordFound = Codewords[codewordRow - i] != null;
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}
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if (closePreviousCodewordFound)
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{
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Codewords[codewordRow] = null;
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} else
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{
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barcodeRow = codeword.RowNumber;
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currentRowHeight = 1;
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}
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}
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}
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return (int)(averageRowHeight + 0.5);
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}
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/// <summary>
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/// Adjusts the in omplete indicator column row numbers.
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/// </summary>
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/// <param name="metadata">Metadata.</param>
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public int AdjustIncompleteIndicatorColumnRowNumbers(BarcodeMetadata metadata)
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{
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ResultPoint top = IsLeft ? Box.TopLeft : Box.TopRight;
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ResultPoint bottom = IsLeft ? Box.BottomLeft : Box.BottomRight;
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int firstRow = IndexForRow((int)top.Y);
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int lastRow = IndexForRow((int)bottom.Y);
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// We need to be careful using the average row height.
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// Barcode could be skewed so that we have smaller and taller rows
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float averageRowHeight = (lastRow - firstRow) / (float)metadata.RowCount;
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// initialize loop
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int barcodeRow = -1;
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int maxRowHeight = 1;
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int currentRowHeight = 0;
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for (int codewordRow = firstRow; codewordRow < lastRow; codewordRow++)
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{
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var codeword = Codewords[codewordRow];
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if (codeword == null)
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{
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continue;
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}
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codeword.SetRowNumberAsRowIndicatorColumn();
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int rowDifference = codeword.RowNumber - barcodeRow;
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// TODO improve handling with case where first row indicator doesn't start with 0
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if (rowDifference == 0)
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{
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currentRowHeight++;
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} else if (rowDifference == 1)
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{
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maxRowHeight = Math.Max(maxRowHeight, currentRowHeight);
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currentRowHeight = 1;
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barcodeRow = codeword.RowNumber;
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} else if (codeword.RowNumber > metadata.RowCount)
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{
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Codewords[codewordRow] = null;
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} else
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{
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barcodeRow = codeword.RowNumber;
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currentRowHeight = 1;
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}
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}
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return (int)(averageRowHeight + 0.5);
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}
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/// <summary>
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/// Gets the row heights.
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/// </summary>
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/// <returns>The row heights.</returns>
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public int[] GetRowHeights()
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{
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BarcodeMetadata metadata = GetBarcodeMetadata();
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if (metadata == null)
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{
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return null;
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}
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AdjustIncompleteIndicatorColumnRowNumbers(metadata);
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int[] result = Enumerable.Repeat(0, metadata.RowCount).ToArray();
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foreach (var word in Codewords)
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{
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if (word != null)
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{
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result[word.RowNumber]++;
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}
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}
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return result;
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}
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/// <summary>
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/// Gets the barcode metadata.
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/// </summary>
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/// <returns>The barcode metadata.</returns>
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public BarcodeMetadata GetBarcodeMetadata()
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{
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BarcodeValue barcodeColumnCount = new BarcodeValue();
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BarcodeValue barcodeRowCountUpperPart = new BarcodeValue();
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BarcodeValue barcodeRowCountLowerPart = new BarcodeValue();
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BarcodeValue barcodeECLevel = new BarcodeValue();
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foreach (Codeword codeword in Codewords)
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{
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if (codeword == null)
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{
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continue;
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}
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codeword.SetRowNumberAsRowIndicatorColumn();
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int rowIndicatorValue = codeword.Value % 30;
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int codewordRowNumber = codeword.RowNumber;
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if (!IsLeft)
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{
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codewordRowNumber += 2;
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}
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switch (codewordRowNumber % 3)
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{
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case 0:
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barcodeRowCountUpperPart.SetValue(rowIndicatorValue * 3 + 1);
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break;
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case 1:
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barcodeECLevel.SetValue(rowIndicatorValue / 3);
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barcodeRowCountLowerPart.SetValue(rowIndicatorValue % 3);
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break;
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case 2:
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barcodeColumnCount.SetValue(rowIndicatorValue + 1);
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break;
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}
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}
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// Maybe we should check if we have ambiguous values?
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if ((barcodeColumnCount.GetValue().Length == 0) ||
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(barcodeRowCountUpperPart.GetValue().Length == 0) ||
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(barcodeRowCountLowerPart.GetValue().Length == 0) ||
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(barcodeECLevel.GetValue().Length == 0) ||
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barcodeColumnCount.GetValue()[0] < 1 ||
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barcodeRowCountUpperPart.GetValue()[0] + barcodeRowCountLowerPart.GetValue()[0] < PDF417Common.MIN_ROWS_IN_BARCODE ||
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barcodeRowCountUpperPart.GetValue()[0] + barcodeRowCountLowerPart.GetValue()[0] > PDF417Common.MAX_ROWS_IN_BARCODE)
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{
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return null;
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}
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BarcodeMetadata barcodeMetadata = new BarcodeMetadata(barcodeColumnCount.GetValue()[0],
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barcodeRowCountUpperPart.GetValue()[0],
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barcodeRowCountLowerPart.GetValue()[0],
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barcodeECLevel.GetValue()[0]);
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RemoveIncorrectCodewords(barcodeMetadata);
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return barcodeMetadata;
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}
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/// <summary>
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/// Prune the codewords which do not match the metadata
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/// TODO Maybe we should keep the incorrect codewords for the start and end positions?
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/// </summary>
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/// <param name="codewords">Codewords.</param>
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/// <param name="metadata">Metadata.</param>
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private void RemoveIncorrectCodewords(BarcodeMetadata metadata)
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{
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for (int row = 0; row < Codewords.Length; row++)
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{
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var codeword = Codewords[row];
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if (codeword == null)
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continue;
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int indicatorValue = codeword.Value % 30;
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int rowNumber = codeword.RowNumber;
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// Row does not exist in the metadata
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if (rowNumber > metadata.RowCount)
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{
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Codewords[row] = null; // remove this.
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continue;
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}
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if (!IsLeft)
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{
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rowNumber += 2;
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}
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switch (rowNumber % 3)
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{
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default:
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case 0:
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if (indicatorValue * 3 + 1 != metadata.RowCountUpper)
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{
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Codewords[row] = null;
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}
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break;
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case 1:
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if (indicatorValue % 3 != metadata.RowCountLower ||
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indicatorValue / 3 != metadata.ErrorCorrectionLevel)
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{
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Codewords[row] = null;
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}
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break;
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case 2:
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if (indicatorValue + 1 != metadata.ColumnCount)
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{
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Codewords[row] = null;
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}
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break;
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}
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}
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}
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/// <summary>
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/// Returns a <see cref="System.String"/> that represents the current <see cref="ZXing.PDF417.Internal.DetectionResultRowIndicatorColumn"/>.
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/// </summary>
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/// <returns>A <see cref="System.String"/> that represents the current <see cref="ZXing.PDF417.Internal.DetectionResultRowIndicatorColumn"/>.</returns>
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public override string ToString()
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{
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return "Is Left: " + IsLeft + " \n" + base.ToString();
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}
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}
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}
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