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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (NIFI-1815) Tesseract OCR Processor
Date Tue, 31 May 2016 20:56:12 GMT


ASF GitHub Bot commented on NIFI-1815:

Github user rkarthik29 commented on a diff in the pull request:
    --- Diff: nifi-nar-bundles/nifi-ocr-bundle/nifi-ocr-processors/src/main/java/org/apache/nifi/processors/ocr/
    @@ -0,0 +1,359 @@
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *
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    + * Unless required by applicable law or agreed to in writing, software
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    + * limitations under the License.
    + */
    +package org.apache.nifi.processors.ocr;
    +import java.awt.image.BufferedImage;
    +import java.util.ArrayList;
    +import java.util.Collections;
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Set;
    +import java.util.concurrent.atomic.AtomicBoolean;
    +import javax.imageio.ImageIO;
    +import org.apache.commons.lang3.StringUtils;
    +import org.apache.nifi.annotation.behavior.InputRequirement;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +import org.apache.nifi.components.AllowableValue;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.components.ValidationContext;
    +import org.apache.nifi.components.ValidationResult;
    +import org.apache.nifi.components.Validator;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.AbstractProcessor;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.Relationship;
    +import org.apache.nifi.processor.exception.ProcessException;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import net.sourceforge.tess4j.ITesseract;
    +import net.sourceforge.tess4j.Tesseract;
    +import net.sourceforge.tess4j.TesseractException;
    +@Tags({"ocr", "tesseract", "image", "text"})
    +@CapabilityDescription("Extracts text from images using Optical Character Recognition
(OCR). The images are pulled from the incoming" +
    +        " Flowfile's content. Supported image types are TIFF, JPEG, GIF, PNG, BMP, and
PDF. Any Flowfile that doesn't contain" +
    +        " a supported image type in its content body will be routed to the 'unsupported
image format' relationship and no OCR will be performed." +
    +        " This processor uses Tesseract to perform its duties and part of that requires
that a valid Tesseract data (Tessdata) directory" +
    +        " be specified in the 'Tessdata Directory' Property. This processor considers
a valid Tessdata directory to be an existing directory on the" +
    +        " local NiFi instance that contains one or more files ending with the '.traineddata'
extension. The list of supported languages" +
    +        " is built from the Tessdata directory configured by listing all files ending
with '.traineddata' and considering those" +
    +        " Tesseract language models. You can create you own Tesseract language models
and place them in your Tessedata directory" +
    +        " and the processor will display it in the dropdown list of languages available.
All valid Tesseract configuration values" +
    +        " may be passed to this processor by use of the 'Tesseract configuration values'
which accepts a comma separated list" +
    +        " of key=value pairs representing Tesseract configurations. 'Tesseract configuration
values' is where all of your tuning" +
    +        " values can be passed in to help increase the accuracy of your OCR operations
based on your expected input images." +
    +        " TesseractOCRProcessor only supports installations of Tesseract version 3.0
and greater.")
    +public class TesseractOCRProcessor extends AbstractProcessor {
    +    public static Set<String> SUPPORTED_LANGUAGES;
    +    private static final String TESS_LANG_EXTENSION = ".traineddata";
    +    private static List<AllowableValue> PAGE_SEGMENTATION_MODES;
    +    private static volatile ITesseract tesseract;
    --- End diff --
    ok, apolgoize did not notice that. i agree with your comment on that one.. It does not
need to be static.

> Tesseract OCR Processor
> -----------------------
>                 Key: NIFI-1815
>                 URL:
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Jeremy Dyer
>            Assignee: Jeremy Dyer
>         Attachments: 0006-changes-to-the-OCR-processor.patch,
> This ticket is a follow-up to NIFI-1718 minus the use of the Tika library
> Expose OCR capabilities through a new processor which uses the Tesseract library. Use
of this processor would require that Tesseract be installed on the NiFi host. Since the processor
will have a system dependency care must be taken to ensure that the overall NiFi cluster continues
to function properly in the absence of the Tesseract system dependency even though the OCR
processor itself will be unable to perform its duties. In the event that the system dependencies
are not detected the processor should display a validation warning rather than failing or
preventing the NiFi instance from booting properly.
> Properties expose to configure Tesseract
> tesseractPath - Path to tesseract installation folder, if not on system path.
> language - Language ID (e.g. "eng"); language dictionary to be used.
> pageSegMode - Tesseract page segmentation mode, defaults to 1.
> minFileSizeToOcr - Minimum file size to submit file to OCR, defaults to 0.
> maxFileSizeToOcr - Maximum file size to submit file to OCR, defaults to Integer.MAX_VALUE.
> timeout - Maximum time (in seconds) to wait for the OCR process termination; defaults
to 120.

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