public FinderPatternFinder(BitMatrix image, ResultPointCallback resultPointCallback) { this.image = image; this.possibleCenters = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10)); this.crossCheckStateCount = new int[5]; this.resultPointCallback = resultPointCallback; }
/// <param name="bitMatrix">{@link BitMatrix} to parse /// </param> /// <throws> ReaderException if dimension is not >= 21 and 1 mod 4 </throws> internal BitMatrixParser(BitMatrix bitMatrix) { int dimension = bitMatrix.Dimension; if (dimension < 21 || (dimension & 0x03) != 1) { throw ReaderException.Instance; } this.bitMatrix = bitMatrix; }
public BinaryBitmap(Binarizer binarizer) { if (binarizer == null) { throw new System.ArgumentException("Binarizer must be non-null."); } this.binarizer = binarizer; matrix = null; }
/// <summary> <p>Implementations of this method reverse the data masking process applied to a QR Code and /// make its bits ready to read.</p> /// /// </summary> /// <param name="bits">representation of QR Code bits /// </param> /// <param name="dimension">dimension of QR Code, represented by bits, being unmasked /// </param> internal void unmaskBitMatrix(BitMatrix bits, int dimension) { for (int i = 0; i < dimension; i++) { for (int j = 0; j < dimension; j++) { if (isMasked(i, j)) { bits.flip(j, i); } } } }
/// <param name="bitMatrix">{@link BitMatrix} to parse /// </param> /// <throws> ReaderException if dimension is < 10 or > 144 or not 0 mod 2 </throws> internal BitMatrixParser(BitMatrix bitMatrix) { int dimension = bitMatrix.Dimension; if (dimension < 10 || dimension > 144 || (dimension & 0x01) != 0) { throw ReaderException.Instance; } version = readVersion(bitMatrix); this.mappingBitMatrix = extractDataRegion(bitMatrix); // TODO(bbrown): Make this work for rectangular symbols this.readMappingMatrix = new BitMatrix(this.mappingBitMatrix.Dimension); }
/// <summary> <p>Convenience method that can decode a Data Matrix Code represented as a 2D array of booleans. /// "true" is taken to mean a black module.</p> /// /// </summary> /// <param name="image">booleans representing white/black Data Matrix Code modules /// </param> /// <returns> text and bytes encoded within the Data Matrix Code /// </returns> /// <throws> ReaderException if the Data Matrix Code cannot be decoded </throws> public DecoderResult decode(bool[][] image) { int dimension = image.Length; BitMatrix bits = new BitMatrix(dimension); for (int i = 0; i < dimension; i++) { for (int j = 0; j < dimension; j++) { if (image[i][j]) { bits.set_Renamed(j, i); } } } return decode(bits); }
/// <summary> <p>Extracts the data region from a {@link BitMatrix} that contains /// alignment patterns.</p> /// /// </summary> /// <param name="bitMatrix">Original {@link BitMatrix} with alignment patterns /// </param> /// <returns> BitMatrix that has the alignment patterns removed /// </returns> internal BitMatrix extractDataRegion(BitMatrix bitMatrix) { int symbolSizeRows = version.SymbolSizeRows; int symbolSizeColumns = version.SymbolSizeColumns; // TODO(bbrown): Make this work with rectangular codes if (bitMatrix.Dimension != symbolSizeRows) { throw new System.ArgumentException("Dimension of bitMarix must match the version size"); } int dataRegionSizeRows = version.DataRegionSizeRows; int dataRegionSizeColumns = version.DataRegionSizeColumns; int numDataRegionsRow = symbolSizeRows / dataRegionSizeRows; int numDataRegionsColumn = symbolSizeColumns / dataRegionSizeColumns; int sizeDataRegionRow = numDataRegionsRow * dataRegionSizeRows; //int sizeDataRegionColumn = numDataRegionsColumn * dataRegionSizeColumns; // TODO(bbrown): Make this work with rectangular codes BitMatrix bitMatrixWithoutAlignment = new BitMatrix(sizeDataRegionRow); for (int dataRegionRow = 0; dataRegionRow < numDataRegionsRow; ++dataRegionRow) { int dataRegionRowOffset = dataRegionRow * dataRegionSizeRows; for (int dataRegionColumn = 0; dataRegionColumn < numDataRegionsColumn; ++dataRegionColumn) { int dataRegionColumnOffset = dataRegionColumn * dataRegionSizeColumns; for (int i = 0; i < dataRegionSizeRows; ++i) { int readRowOffset = dataRegionRow * (dataRegionSizeRows + 2) + 1 + i; int writeRowOffset = dataRegionRowOffset + i; for (int j = 0; j < dataRegionSizeColumns; ++j) { int readColumnOffset = dataRegionColumn * (dataRegionSizeColumns + 2) + 1 + j; if (bitMatrix.get_Renamed(readColumnOffset, readRowOffset)) { int writeColumnOffset = dataRegionColumnOffset + j; bitMatrixWithoutAlignment.set_Renamed(writeColumnOffset, writeRowOffset); } } } } } return bitMatrixWithoutAlignment; }
private static BitMatrix sampleGrid(BitMatrix matrix, ResultPoint topLeft, ResultPoint bottomLeft, ResultPoint topRight, ResultPoint bottomRight, int dimension) { // Note that unlike the QR Code sampler, we didn't find the center of modules, but the // very corners. So there is no 0.5f here; 0.0f is right. GridSampler sampler = GridSampler.Instance; return sampler.sampleGrid(matrix, dimension, 0.0f, 0.0f, dimension, 0.0f, dimension, dimension, 0.0f, dimension, topLeft.X, topLeft.Y, topRight.X, topRight.Y, bottomRight.X, bottomRight.Y, bottomLeft.X, bottomLeft.Y); // p4FromY }
public Detector(BitMatrix image) { this.image = image; }
/// <summary> This method detects a Data Matrix code in a "pure" image -- that is, pure monochrome image /// which contains only an unrotated, unskewed, image of a Data Matrix code, with some white border /// around it. This is a specialized method that works exceptionally fast in this special /// case. /// </summary> private static BitMatrix extractPureBits(BitMatrix image) { // Now need to determine module size in pixels int height = image.Height; int width = image.Width; int minDimension = System.Math.Min(height, width); // First, skip white border by tracking diagonally from the top left down and to the right: int borderWidth = 0; while (borderWidth < minDimension && !image.get_Renamed(borderWidth, borderWidth)) { borderWidth++; } if (borderWidth == minDimension) { throw ReaderException.Instance; } // And then keep tracking across the top-left black module to determine module size int moduleEnd = borderWidth + 1; while (moduleEnd < width && image.get_Renamed(moduleEnd, borderWidth)) { moduleEnd++; } if (moduleEnd == width) { throw ReaderException.Instance; } int moduleSize = moduleEnd - borderWidth; // And now find where the bottommost black module on the first column ends int columnEndOfSymbol = height - 1; while (columnEndOfSymbol >= 0 && !image.get_Renamed(borderWidth, columnEndOfSymbol)) { columnEndOfSymbol--; } if (columnEndOfSymbol < 0) { throw ReaderException.Instance; } columnEndOfSymbol++; // Make sure width of barcode is a multiple of module size if ((columnEndOfSymbol - borderWidth) % moduleSize != 0) { throw ReaderException.Instance; } int dimension = (columnEndOfSymbol - borderWidth) / moduleSize; // Push in the "border" by half the module width so that we start // sampling in the middle of the module. Just in case the image is a // little off, this will help recover. borderWidth += (moduleSize >> 1); int sampleDimension = borderWidth + (dimension - 1) * moduleSize; if (sampleDimension >= width || sampleDimension >= height) { throw ReaderException.Instance; } // Now just read off the bits BitMatrix bits = new BitMatrix(dimension); for (int i = 0; i < dimension; i++) { int iOffset = borderWidth + i * moduleSize; for (int j = 0; j < dimension; j++) { if (image.get_Renamed(borderWidth + j * moduleSize, iOffset)) { bits.set_Renamed(j, i); } } } return bits; }
/// <summary> This method detects a barcode in a "pure" image -- that is, pure monochrome image /// which contains only an unrotated, unskewed, image of a barcode, with some white border /// around it. This is a specialized method that works exceptionally fast in this special /// case. /// </summary> private static BitMatrix extractPureBits(BinaryBitmap image) { // Now need to determine module size in pixels BitMatrix matrix = image.BlackMatrix; int height = matrix.Height; int width = matrix.Width; int minDimension = System.Math.Min(height, width); // First, skip white border by tracking diagonally from the top left down and to the right: int borderWidth = 0; while (borderWidth < minDimension && !matrix.get_Renamed(borderWidth, borderWidth)) { borderWidth++; } if (borderWidth == minDimension) { throw ReaderException.Instance; } // And then keep tracking across the top-left black module to determine module size int moduleEnd = borderWidth; while (moduleEnd < minDimension && matrix.get_Renamed(moduleEnd, moduleEnd)) { moduleEnd++; } if (moduleEnd == minDimension) { throw ReaderException.Instance; } int moduleSize = moduleEnd - borderWidth; // And now find where the rightmost black module on the first row ends int rowEndOfSymbol = width - 1; while (rowEndOfSymbol >= 0 && !matrix.get_Renamed(rowEndOfSymbol, borderWidth)) { rowEndOfSymbol--; } if (rowEndOfSymbol < 0) { throw ReaderException.Instance; } rowEndOfSymbol++; // Make sure width of barcode is a multiple of module size if ((rowEndOfSymbol - borderWidth) % moduleSize != 0) { throw ReaderException.Instance; } int dimension = (rowEndOfSymbol - borderWidth) / moduleSize; // Push in the "border" by half the module width so that we start // sampling in the middle of the module. Just in case the image is a // little off, this will help recover. borderWidth += (moduleSize >> 1); int sampleDimension = borderWidth + (dimension - 1) * moduleSize; if (sampleDimension >= width || sampleDimension >= height) { throw ReaderException.Instance; } // Now just read off the bits BitMatrix bits = new BitMatrix(dimension); for (int y = 0; y < dimension; y++) { int iOffset = borderWidth + y * moduleSize; for (int x = 0; x < dimension; x++) { if (matrix.get_Renamed(borderWidth + x * moduleSize, iOffset)) { bits.set_Renamed(x, y); } } } return bits; }
private static BitMatrix sampleGrid(BitMatrix image, PerspectiveTransform transform, int dimension) { GridSampler sampler = GridSampler.Instance; return sampler.sampleGrid(image, dimension, transform); }
public Detector(BitMatrix image) { this.image = image; rectangleDetector = new MonochromeRectangleDetector(image); }
private static BitMatrix sampleGrid(BitMatrix image, ResultPoint topLeft, ResultPoint bottomLeft, ResultPoint bottomRight, int dimension) { // We make up the top right point for now, based on the others. // TODO: we actually found a fourth corner above and figured out which of two modules // it was the corner of. We could use that here and adjust for perspective distortion. float topRightX = (bottomRight.X - bottomLeft.X) + topLeft.X; float topRightY = (bottomRight.Y - bottomLeft.Y) + topLeft.Y; // Note that unlike in the QR Code sampler, we didn't find the center of modules, but the // very corners. So there is no 0.5f here; 0.0f is right. GridSampler sampler = GridSampler.Instance; return sampler.sampleGrid(image, dimension, 0.0f, 0.0f, dimension, 0.0f, dimension, dimension, 0.0f, dimension, topLeft.X, topLeft.Y, topRightX, topRightY, bottomRight.X, bottomRight.Y, bottomLeft.X, bottomLeft.Y); }
internal BitMatrixParser(BitMatrix bitMatrix) { this.bitMatrix = bitMatrix; }
/// <summary> <p>Creates a finder that will search the image for three finder patterns.</p> /// /// </summary> /// <param name="image">image to search /// </param> public FinderPatternFinder(BitMatrix image) : this(image, null) { }
public MultiDetector(BitMatrix image) : base(image) { }
/// <summary> <p>Creates the version object based on the dimension of the original bit matrix from /// the datamatrix code.</p> /// /// <p>See ISO 16022:2006 Table 7 - ECC 200 symbol attributes</p> /// /// </summary> /// <param name="bitMatrix">Original {@link BitMatrix} including alignment patterns /// </param> /// <returns> {@link Version} encapsulating the Data Matrix Code's "version" /// </returns> /// <throws> ReaderException if the dimensions of the mapping matrix are not valid </throws> /// <summary> Data Matrix dimensions. /// </summary> internal Version readVersion(BitMatrix bitMatrix) { if (version != null) { return version; } // TODO(bbrown): make this work for rectangular dimensions as well. int numRows = bitMatrix.Dimension; int numColumns = numRows; return Version.getVersionForDimensions(numRows, numColumns); }
/// <summary> Locate the vertices and the codewords area of a black blob using the Start /// and Stop patterns as locators. This assumes that the image is rotated 180 /// degrees and if it locates the start and stop patterns at it will re-map /// the vertices for a 0 degree rotation. /// TODO: Change assumption about barcode location. /// TODO: Scanning every row is very expensive. We should only do this for TRY_HARDER. /// /// </summary> /// <param name="matrix">the scanned barcode image. /// </param> /// <returns> an array containing the vertices: /// vertices[0] x, y top left barcode /// vertices[1] x, y bottom left barcode /// vertices[2] x, y top right barcode /// vertices[3] x, y bottom right barcode /// vertices[4] x, y top left codeword area /// vertices[5] x, y bottom left codeword area /// vertices[6] x, y top right codeword area /// vertices[7] x, y bottom right codeword area /// </returns> private static ResultPoint[] findVertices180(BitMatrix matrix) { int height = matrix.Height; int width = matrix.Width; int halfWidth = width >> 1; ResultPoint[] result = new ResultPoint[8]; bool found = false; // Top Left for (int i = height - 1; i > 0; i--) { int[] loc = findGuardPattern(matrix, halfWidth, i, halfWidth, true, START_PATTERN_REVERSE); if (loc != null) { result[0] = new ResultPoint(loc[1], i); result[4] = new ResultPoint(loc[0], i); found = true; break; } } // Bottom Left if (found) { // Found the Top Left vertex found = false; for (int i = 0; i < height; i++) { int[] loc = findGuardPattern(matrix, halfWidth, i, halfWidth, true, START_PATTERN_REVERSE); if (loc != null) { result[1] = new ResultPoint(loc[1], i); result[5] = new ResultPoint(loc[0], i); found = true; break; } } } // Top Right if (found) { // Found the Bottom Left vertex found = false; for (int i = height - 1; i > 0; i--) { int[] loc = findGuardPattern(matrix, 0, i, halfWidth, false, STOP_PATTERN_REVERSE); if (loc != null) { result[2] = new ResultPoint(loc[0], i); result[6] = new ResultPoint(loc[1], i); found = true; break; } } } // Bottom Right if (found) { // Found the Top Right vertex found = false; for (int i = 0; i < height; i++) { int[] loc = findGuardPattern(matrix, 0, i, halfWidth, false, STOP_PATTERN_REVERSE); if (loc != null) { result[3] = new ResultPoint(loc[0], i); result[7] = new ResultPoint(loc[1], i); found = true; break; } } } return found?result:null; }
/// <param name="matrix">row of black/white values to search /// </param> /// <param name="column">x position to start search /// </param> /// <param name="row">y position to start search /// </param> /// <param name="width">the number of pixels to search on this row /// </param> /// <param name="pattern">pattern of counts of number of black and white pixels that are /// being searched for as a pattern /// </param> /// <returns> start/end horizontal offset of guard pattern, as an array of two ints. /// </returns> private static int[] findGuardPattern(BitMatrix matrix, int column, int row, int width, bool whiteFirst, int[] pattern) { int patternLength = pattern.Length; // TODO: Find a way to cache this array, as this method is called hundreds of times // per image, and we want to allocate as seldom as possible. int[] counters = new int[patternLength]; bool isWhite = whiteFirst; int counterPosition = 0; int patternStart = column; for (int x = column; x < column + width; x++) { bool pixel = matrix.get_Renamed(x, row); if (pixel ^ isWhite) { counters[counterPosition]++; } else { if (counterPosition == patternLength - 1) { if (patternMatchVariance(counters, pattern, MAX_INDIVIDUAL_VARIANCE) < MAX_AVG_VARIANCE) { return new int[]{patternStart, x}; } patternStart += counters[0] + counters[1]; for (int y = 2; y < patternLength; y++) { counters[y - 2] = counters[y]; } counters[patternLength - 2] = 0; counters[patternLength - 1] = 0; counterPosition--; } else { counterPosition++; } counters[counterPosition] = 1; isWhite = !isWhite; } } return null; }
/// <summary> <p>Decodes a Data Matrix Code represented as a {@link BitMatrix}. A 1 or "true" is taken /// to mean a black module.</p> /// /// </summary> /// <param name="bits">booleans representing white/black Data Matrix Code modules /// </param> /// <returns> text and bytes encoded within the Data Matrix Code /// </returns> /// <throws> ReaderException if the Data Matrix Code cannot be decoded </throws> public DecoderResult decode(BitMatrix bits) { // Construct a parser and read version, error-correction level BitMatrixParser parser = new BitMatrixParser(bits); Version version = parser.readVersion(bits); // Read codewords sbyte[] codewords = parser.readCodewords(); // Separate into data blocks DataBlock[] dataBlocks = DataBlock.getDataBlocks(codewords, version); // Count total number of data bytes int totalBytes = 0; for (int i = 0; i < dataBlocks.Length; i++) { totalBytes += dataBlocks[i].NumDataCodewords; } sbyte[] resultBytes = new sbyte[totalBytes]; int resultOffset = 0; // Error-correct and copy data blocks together into a stream of bytes for (int j = 0; j < dataBlocks.Length; j++) { DataBlock dataBlock = dataBlocks[j]; sbyte[] codewordBytes = dataBlock.Codewords; int numDataCodewords = dataBlock.NumDataCodewords; correctErrors(codewordBytes, numDataCodewords); for (int i = 0; i < numDataCodewords; i++) { resultBytes[resultOffset++] = codewordBytes[i]; } } // Decode the contents of that stream of bytes return DecodedBitStreamParser.decode(resultBytes); }
public MonochromeRectangleDetector(BitMatrix image) { this.image = image; }
/// <summary> <p>Creates a finder that will look in a portion of the whole image.</p> /// /// </summary> /// <param name="image">image to search /// </param> /// <param name="startX">left column from which to start searching /// </param> /// <param name="startY">top row from which to start searching /// </param> /// <param name="width">width of region to search /// </param> /// <param name="height">height of region to search /// </param> /// <param name="moduleSize">estimated module size so far /// </param> internal AlignmentPatternFinder(BitMatrix image, int startX, int startY, int width, int height, float moduleSize, ResultPointCallback resultPointCallback) { this.image = image; this.possibleCenters = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(5)); this.startX = startX; this.startY = startY; this.width = width; this.height = height; this.moduleSize = moduleSize; this.crossCheckStateCount = new int[3]; this.resultPointCallback = resultPointCallback; }