Examples with ReaderException com.google.zxing.ReaderException used on opensource projects

Example 31 with ReaderException

use of com.google.zxing.ReaderException in project zxing by zxing.

the class OneDReader method doDecode.

/**
   * We're going to examine rows from the middle outward, searching alternately above and below the
   * middle, and farther out each time. rowStep is the number of rows between each successive
   * attempt above and below the middle. So we'd scan row middle, then middle - rowStep, then
   * middle + rowStep, then middle - (2 * rowStep), etc.
   * rowStep is bigger as the image is taller, but is always at least 1. We've somewhat arbitrarily
   * decided that moving up and down by about 1/16 of the image is pretty good; we try more of the
   * image if "trying harder".
   *
   * @param image The image to decode
   * @param hints Any hints that were requested
   * @return The contents of the decoded barcode
   * @throws NotFoundException Any spontaneous errors which occur
   */
private Result doDecode(BinaryBitmap image, Map<DecodeHintType, ?> hints) throws NotFoundException {
    int width = image.getWidth();
    int height = image.getHeight();
    BitArray row = new BitArray(width);
    boolean tryHarder = hints != null && hints.containsKey(DecodeHintType.TRY_HARDER);
    int rowStep = Math.max(1, height >> (tryHarder ? 8 : 5));
    int maxLines;
    if (tryHarder) {
        // Look at the whole image, not just the center
        maxLines = height;
    } else {
        // 15 rows spaced 1/32 apart is roughly the middle half of the image
        maxLines = 15;
    }
    int middle = height / 2;
    for (int x = 0; x < maxLines; x++) {
        // Scanning from the middle out. Determine which row we're looking at next:
        int rowStepsAboveOrBelow = (x + 1) / 2;
        // i.e. is x even?
        boolean isAbove = (x & 0x01) == 0;
        int rowNumber = middle + rowStep * (isAbove ? rowStepsAboveOrBelow : -rowStepsAboveOrBelow);
        if (rowNumber < 0 || rowNumber >= height) {
            // Oops, if we run off the top or bottom, stop
            break;
        }
        // Estimate black point for this row and load it:
        try {
            row = image.getBlackRow(rowNumber, row);
        } catch (NotFoundException ignored) {
            continue;
        }
        // handle decoding upside down barcodes.
        for (int attempt = 0; attempt < 2; attempt++) {
            if (attempt == 1) {
                // trying again?
                // reverse the row and continue
                row.reverse();
                // that start on the center line.
                if (hints != null && hints.containsKey(DecodeHintType.NEED_RESULT_POINT_CALLBACK)) {
                    Map<DecodeHintType, Object> newHints = new EnumMap<>(DecodeHintType.class);
                    newHints.putAll(hints);
                    newHints.remove(DecodeHintType.NEED_RESULT_POINT_CALLBACK);
                    hints = newHints;
                }
            }
            try {
                // Look for a barcode
                Result result = decodeRow(rowNumber, row, hints);
                // We found our barcode
                if (attempt == 1) {
                    // But it was upside down, so note that
                    result.putMetadata(ResultMetadataType.ORIENTATION, 180);
                    // And remember to flip the result points horizontally.
                    ResultPoint[] points = result.getResultPoints();
                    if (points != null) {
                        points[0] = new ResultPoint(width - points[0].getX() - 1, points[0].getY());
                        points[1] = new ResultPoint(width - points[1].getX() - 1, points[1].getY());
                    }
                }
                return result;
            } catch (ReaderException re) {
            // continue -- just couldn't decode this row
            }
        }
    }
    throw NotFoundException.getNotFoundInstance();
}

Example 32 with ReaderException

use of com.google.zxing.ReaderException in project QRCode by 5peak2me.

the class DecodeHandler method decode.

/**
	 * Decode the data within the viewfinder rectangle, and time how long it
	 * took. For efficiency, reuse the same reader objects from one decode to
	 * the next.
	 * 
	 * @param data
	 *            The YUV preview frame.
	 * @param width
	 *            The width of the preview frame.
	 * @param height
	 *            The height of the preview frame.
	 */
private void decode(byte[] data, int width, int height) {
    long start = System.currentTimeMillis();
    Result rawResult = null;
    // modify here
    byte[] rotatedData = new byte[data.length];
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) rotatedData[x * height + height - y - 1] = data[x + y * width];
    }
    // Here we are swapping, that's the difference to #11
    int tmp = width;
    width = height;
    height = tmp;
    PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    try {
        rawResult = multiFormatReader.decodeWithState(bitmap);
    } catch (ReaderException re) {
    // continue
    } finally {
        multiFormatReader.reset();
    }
    if (rawResult != null) {
        long end = System.currentTimeMillis();
        Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());
        Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, rawResult);
        Bundle bundle = new Bundle();
        bundle.putParcelable(DecodeThread.BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
        message.setData(bundle);
        // Log.d(TAG, "Sending decode succeeded message...");
        message.sendToTarget();
    } else {
        Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);
        message.sendToTarget();
    }
}

Example 33 with ReaderException

use of com.google.zxing.ReaderException in project QRCode by 5peak2me.

the class DecodeHandler method decode.

/**
   * Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
   * reuse the same reader objects from one decode to the next.
   *
   * @param data   The YUV preview frame.
   * @param width  The width of the preview frame.
   * @param height The height of the preview frame.
   */
private void decode(byte[] data, int width, int height) {
    long start = System.currentTimeMillis();
    Result rawResult = null;
    //modify here
    byte[] rotatedData = new byte[data.length];
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) rotatedData[x * height + height - y - 1] = data[x + y * width];
    }
    // Here we are swapping, that's the difference to #11
    int tmp = width;
    width = height;
    height = tmp;
    PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    try {
        rawResult = multiFormatReader.decodeWithState(bitmap);
    } catch (ReaderException re) {
    // continue
    } finally {
        multiFormatReader.reset();
    }
    if (rawResult != null) {
        long end = System.currentTimeMillis();
        Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());
        Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, rawResult);
        Bundle bundle = new Bundle();
        bundle.putParcelable(DecodeThread.BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
        message.setData(bundle);
        //Log.d(TAG, "Sending decode succeeded message...");
        message.sendToTarget();
    } else {
        Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);
        message.sendToTarget();
    }
}

Example 34 with ReaderException

use of com.google.zxing.ReaderException in project wechat by motianhuo.

the class DecodeHandler method decode.

/**
	 * Decode the data within the viewfinder rectangle, and time how long it
	 * took. For efficiency, reuse the same reader objects from one decode to
	 * the next.
	 * 
	 * @param data
	 *            The YUV preview frame.
	 * @param width
	 *            The width of the preview frame.
	 * @param height
	 *            The height of the preview frame.
	 */
private void decode(byte[] data, int width, int height) {
    long start = System.currentTimeMillis();
    Result rawResult = null;
    // modify here
    byte[] rotatedData = new byte[data.length];
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) rotatedData[x * height + height - y - 1] = data[x + y * width];
    }
    // Here we are swapping, that's the difference to #11
    int tmp = width;
    width = height;
    height = tmp;
    PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    try {
        rawResult = multiFormatReader.decodeWithState(bitmap);
    } catch (ReaderException re) {
    // continue
    } finally {
        multiFormatReader.reset();
    }
    if (rawResult != null) {
        long end = System.currentTimeMillis();
        Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());
        Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, rawResult);
        Bundle bundle = new Bundle();
        bundle.putParcelable(DecodeThread.BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
        message.setData(bundle);
        // Log.d(TAG, "Sending decode succeeded message...");
        message.sendToTarget();
    } else {
        Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);
        message.sendToTarget();
    }
}

Example 35 with ReaderException

use of com.google.zxing.ReaderException in project BarcodeEye by BarcodeEye.

the class DecodeHandler method decode.

/**
   * Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
   * reuse the same reader objects from one decode to the next.
   *
   * @param data   The YUV preview frame.
   * @param width  The width of the preview frame.
   * @param height The height of the preview frame.
   */
private void decode(byte[] data, int width, int height) {
    long start = System.currentTimeMillis();
    Result rawResult = null;
    PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(data, width, height);
    if (source != null) {
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        try {
            rawResult = multiFormatReader.decodeWithState(bitmap);
        } catch (ReaderException re) {
        // continue
        } finally {
            multiFormatReader.reset();
        }
    }
    Handler handler = activity.getHandler();
    if (rawResult != null) {
        // Don't log the barcode contents for security.
        long end = System.currentTimeMillis();
        Log.d(TAG, "Found barcode in " + (end - start) + " ms");
        if (handler != null) {
            Message message = Message.obtain(handler, R.id.decode_succeeded, rawResult);
            Bundle bundle = new Bundle();
            bundleThumbnail(source, bundle);
            message.setData(bundle);
            message.sendToTarget();
        }
    } else {
        if (handler != null) {
            Message message = Message.obtain(handler, R.id.decode_failed);
            message.sendToTarget();
        }
    }
}