mirror of
https://gitee.com/akwkevin/aistudio.-wpf.-diagram
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376 lines
14 KiB
C#
376 lines
14 KiB
C#
/*
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* Copyright 2013 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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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</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)
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: base(box)
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{
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this.IsLeft = isLeft;
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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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}
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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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var codewords = Codewords;
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setRowNumbers(); // Assign this as an indicator column
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removeIncorrectCodewords(codewords, 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 = imageRowToCodewordIndex((int) top.Y);
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int lastRow = imageRowToCodewordIndex((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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}
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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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}
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else if (rowDifference < 0 ||
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codeword.RowNumber >= metadata.RowCount ||
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rowDifference > codewordRow)
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{
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codewords[codewordRow] = null;
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}
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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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}
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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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// there must be (height * rowDifference) number of codewords missing. For now we assume height = 1.
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// This should hopefully get rid of most problems already.
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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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}
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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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/// 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 barcodeMetadata = getBarcodeMetadata();
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if (barcodeMetadata == null)
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{
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return null;
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}
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adjustIncompleteIndicatorColumnRowNumbers(barcodeMetadata);
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int[] result = new int[barcodeMetadata.RowCount];
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foreach (var codeword in Codewords)
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{
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if (codeword != null)
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{
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int rowNumber = codeword.RowNumber;
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if (rowNumber >= result.Length)
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{
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return null;
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}
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result[rowNumber]++;
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} // else throw exception? (or return null)
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}
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return result;
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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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// 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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ResultPoint top = IsLeft ? Box.TopLeft : Box.TopRight;
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ResultPoint bottom = IsLeft ? Box.BottomLeft : Box.BottomRight;
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int firstRow = imageRowToCodewordIndex((int) top.Y);
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int lastRow = imageRowToCodewordIndex((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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var codewords = Codewords;
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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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}
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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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}
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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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}
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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 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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var codewords = Codewords;
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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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var barcodeColumnCountValues = barcodeColumnCount.getValue();
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var barcodeRowCountUpperPartValues = barcodeRowCountUpperPart.getValue();
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var barcodeRowCountLowerPartValues = barcodeRowCountLowerPart.getValue();
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var barcodeECLevelValues = barcodeECLevel.getValue();
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if ((barcodeColumnCountValues.Length == 0) ||
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(barcodeRowCountUpperPartValues.Length == 0) ||
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(barcodeRowCountLowerPartValues.Length == 0) ||
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(barcodeECLevelValues.Length == 0) ||
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barcodeColumnCountValues[0] < 1 ||
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barcodeRowCountUpperPartValues[0] + barcodeRowCountLowerPartValues[0] < PDF417Common.MIN_ROWS_IN_BARCODE ||
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barcodeRowCountUpperPartValues[0] + barcodeRowCountLowerPartValues[0] > PDF417Common.MAX_ROWS_IN_BARCODE)
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{
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return null;
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}
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var barcodeMetadata = new BarcodeMetadata(barcodeColumnCountValues[0],
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barcodeRowCountUpperPartValues[0],
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barcodeRowCountLowerPartValues[0],
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barcodeECLevelValues[0]);
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removeIncorrectCodewords(codewords, 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(Codeword[] codewords, 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) // different to java 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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} |
