Examples with DecoderResult com.google.zxing.common.DecoderResult used on opensource projects

Example 31 with DecoderResult

use of com.google.zxing.common.DecoderResult in project zxing by zxing.

the class DetectorTest method testErrorInParameterLocator.

// Test that we can tolerate errors in the parameter locator bits
private static void testErrorInParameterLocator(String data) throws Exception {
    AztecCode aztec = Encoder.encode(data.getBytes(StandardCharsets.ISO_8859_1), 25, Encoder.DEFAULT_AZTEC_LAYERS);
    // pseudo-random, but deterministic
    Random random = new Random(aztec.getMatrix().hashCode());
    int layers = aztec.getLayers();
    boolean compact = aztec.isCompact();
    List<Point> orientationPoints = getOrientationPoints(aztec);
    for (boolean isMirror : new boolean[] { false, true }) {
        for (BitMatrix matrix : getRotations(aztec.getMatrix())) {
            // Systematically try every possible 1- and 2-bit error.
            for (int error1 = 0; error1 < orientationPoints.size(); error1++) {
                for (int error2 = error1; error2 < orientationPoints.size(); error2++) {
                    BitMatrix copy = isMirror ? transpose(matrix) : clone(matrix);
                    copy.flip(orientationPoints.get(error1).getX(), orientationPoints.get(error1).getY());
                    if (error2 > error1) {
                        // if error2 == error1, we only test a single error
                        copy.flip(orientationPoints.get(error2).getX(), orientationPoints.get(error2).getY());
                    }
                    // The detector doesn't seem to work when matrix bits are only 1x1.  So magnify.
                    AztecDetectorResult r = new Detector(makeLarger(copy, 3)).detect(isMirror);
                    assertNotNull(r);
                    assertEquals(r.getNbLayers(), layers);
                    assertEquals(r.isCompact(), compact);
                    DecoderResult res = new Decoder().decode(r);
                    assertEquals(data, res.getText());
                }
            }
            // Try a few random three-bit errors;
            for (int i = 0; i < 5; i++) {
                BitMatrix copy = clone(matrix);
                Collection<Integer> errors = new TreeSet<>();
                while (errors.size() < 3) {
                    // Quick and dirty way of getting three distinct integers between 1 and n.
                    errors.add(random.nextInt(orientationPoints.size()));
                }
                for (int error : errors) {
                    copy.flip(orientationPoints.get(error).getX(), orientationPoints.get(error).getY());
                }
                try {
                    new Detector(makeLarger(copy, 3)).detect(false);
                    fail("Should not reach here");
                } catch (NotFoundException expected) {
                // continue
                }
            }
        }
    }
}

Example 32 with DecoderResult

use of com.google.zxing.common.DecoderResult in project zxing by zxing.

the class EncoderTest method testEncodeDecode.

private static void testEncodeDecode(String data, boolean compact, int layers) throws Exception {
    AztecCode aztec = Encoder.encode(data.getBytes(StandardCharsets.ISO_8859_1), 25, Encoder.DEFAULT_AZTEC_LAYERS);
    assertEquals("Unexpected symbol format (compact)", compact, aztec.isCompact());
    assertEquals("Unexpected nr. of layers", layers, aztec.getLayers());
    BitMatrix matrix = aztec.getMatrix();
    AztecDetectorResult r = new AztecDetectorResult(matrix, NO_POINTS, aztec.isCompact(), aztec.getCodeWords(), aztec.getLayers());
    DecoderResult res = new Decoder().decode(r);
    assertEquals(data, res.getText());
    // Check error correction by introducing a few minor errors
    Random random = getPseudoRandom();
    matrix.flip(random.nextInt(matrix.getWidth()), random.nextInt(2));
    matrix.flip(random.nextInt(matrix.getWidth()), matrix.getHeight() - 2 + random.nextInt(2));
    matrix.flip(random.nextInt(2), random.nextInt(matrix.getHeight()));
    matrix.flip(matrix.getWidth() - 2 + random.nextInt(2), random.nextInt(matrix.getHeight()));
    r = new AztecDetectorResult(matrix, NO_POINTS, aztec.isCompact(), aztec.getCodeWords(), aztec.getLayers());
    res = new Decoder().decode(r);
    assertEquals(data, res.getText());
}

Example 33 with DecoderResult

use of com.google.zxing.common.DecoderResult in project weex-example by KalicyZhou.

the class PDF417ScanningDecoder method decodeCodewords.

private static DecoderResult decodeCodewords(int[] codewords, int ecLevel, int[] erasures) throws FormatException, ChecksumException {
    if (codewords.length == 0) {
        throw FormatException.getFormatInstance();
    }
    int numECCodewords = 1 << (ecLevel + 1);
    int correctedErrorsCount = correctErrors(codewords, erasures, numECCodewords);
    verifyCodewordCount(codewords, numECCodewords);
    // Decode the codewords
    DecoderResult decoderResult = DecodedBitStreamParser.decode(codewords, String.valueOf(ecLevel));
    decoderResult.setErrorsCorrected(correctedErrorsCount);
    decoderResult.setErasures(erasures.length);
    return decoderResult;
}

Example 34 with DecoderResult

use of com.google.zxing.common.DecoderResult in project weex-example by KalicyZhou.

the class Decoder method decode.

/**
   * <p>Decodes a QR Code represented as a {@link BitMatrix}. A 1 or "true" is taken to mean a black module.</p>
   *
   * @param bits booleans representing white/black QR Code modules
   * @param hints decoding hints that should be used to influence decoding
   * @return text and bytes encoded within the QR Code
   * @throws FormatException if the QR Code cannot be decoded
   * @throws ChecksumException if error correction fails
   */
public DecoderResult decode(BitMatrix bits, Map<DecodeHintType, ?> hints) throws FormatException, ChecksumException {
    // Construct a parser and read version, error-correction level
    BitMatrixParser parser = new BitMatrixParser(bits);
    FormatException fe = null;
    ChecksumException ce = null;
    try {
        return decode(parser, hints);
    } catch (FormatException e) {
        fe = e;
    } catch (ChecksumException e) {
        ce = e;
    }
    try {
        // Revert the bit matrix
        parser.remask();
        // Will be attempting a mirrored reading of the version and format info.
        parser.setMirror(true);
        // Preemptively read the version.
        parser.readVersion();
        // Preemptively read the format information.
        parser.readFormatInformation();
        /*
       * Since we're here, this means we have successfully detected some kind
       * of version and format information when mirrored. This is a good sign,
       * that the QR code may be mirrored, and we should try once more with a
       * mirrored content.
       */
        // Prepare for a mirrored reading.
        parser.mirror();
        DecoderResult result = decode(parser, hints);
        // Success! Notify the caller that the code was mirrored.
        result.setOther(new QRCodeDecoderMetaData(true));
        return result;
    } catch (FormatException | ChecksumException e) {
        // Throw the exception from the original reading
        if (fe != null) {
            throw fe;
        }
        if (ce != null) {
            throw ce;
        }
        throw e;
    }
}

Example 35 with DecoderResult

use of com.google.zxing.common.DecoderResult in project weex-example by KalicyZhou.

the class PDF417Reader method decode.

private static Result[] decode(BinaryBitmap image, Map<DecodeHintType, ?> hints, boolean multiple) throws NotFoundException, FormatException, ChecksumException {
    List<Result> results = new ArrayList<>();
    PDF417DetectorResult detectorResult = Detector.detect(image, hints, multiple);
    for (ResultPoint[] points : detectorResult.getPoints()) {
        DecoderResult decoderResult = PDF417ScanningDecoder.decode(detectorResult.getBits(), points[4], points[5], points[6], points[7], getMinCodewordWidth(points), getMaxCodewordWidth(points));
        Result result = new Result(decoderResult.getText(), decoderResult.getRawBytes(), points, BarcodeFormat.PDF_417);
        result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, decoderResult.getECLevel());
        PDF417ResultMetadata pdf417ResultMetadata = (PDF417ResultMetadata) decoderResult.getOther();
        if (pdf417ResultMetadata != null) {
            result.putMetadata(ResultMetadataType.PDF417_EXTRA_METADATA, pdf417ResultMetadata);
        }
        results.add(result);
    }
    return results.toArray(new Result[results.size()]);
}