Content transformer for OCR ABBYY OCR4LINUX client

deajan — Thu, 12 Mar 2015 16:55:16 GMT

Hello,I've freshly installed an Alfresco Community 5.0.c on a CentOS 7 server and tried to copy my earlier OCR integration from my Alfresco 4.2.c install.I've created a custom content transformer in /opt/alfresco-5.0.c/tomcat/shared/classes/alfresco/extension/ocr-tiff-pdf-transformer.xml containing

Re: Content transformer for OCR ABBYY OCR4LINUX client

deajan — Fri, 13 Mar 2015 12:40:00 GMT

Well i found the solution.
Whenever a transformer is added, it's name should end with -context.xml
This wasn't the default behavior in 4.2c, neither is it clearly expressed in the wiki.

Anyway, i managed to write a nice Abbyy OCR wrapper that works for Abbyyocr11, that can convert tiff or jpeg images to OCRed PDFs.
Here's the working code of my transformer. Hopefully this will help other underpaid sysadmins

# cat /opt/alfresco-5.0.c/tomcat/shared/classes/alfresco/extension/ocr-transform-context.xml


<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN//EN' 'http://www.springframework.org/dtd/spring-beans.dtd'>
    <beans>
        <bean id="transformer.worker.ocrabbyy.tiffjpeg" class="org.alfresco.repo.content.transform.RuntimeExecutableContentTransformerWorker">
            <property name="mimetypeService">
                <ref bean="mimetypeService" />
            </property>
              <property name="checkCommand">
                 <bean class="org.alfresco.util.exec.RuntimeExec">
                    <property name="commandsAndArguments">
                        <map>
                            <entry key=".*">
                                <list>
                                     <value>/usr/local/bin/abbyyocr11</value>
                                </list>
                            </entry>
                        </map>
                    </property>
                    <property name="errorCodes">
                       <value>2</value>
                    </property>
                 </bean>
              </property>
              <property name="transformCommand">
                 <bean class="org.alfresco.util.exec.RuntimeExec">
                    <property name="commandsAndArguments">
                        <map>
                            <entry key=".*">
                                <list>
                                    <value>/usr/local/bin/abbyyocr11</value>
                                    <value>-if</value>
                                    <value>${source}</value>
                                    <value>-lpp</value>                     <!– Predefined profile –>
                                    <value>TextExtraction_Accuracy</value>
                                    <value>-adb</value>                     <!– Detect barcodes –>
                                    <value>-ido</value>                     <!– Detect and rotate image orientation –>
                                    <value>-adtop</value>                   <!– Detect text embedded in images –>
                                    <value>-rl</value>                      <!– List of languages for the document –>
                                    <value>French,English,Spanish</value>
                                    <value>-recc</value>                    <!– Enhanced character confidence –>
                                    <value>-pfs</value>                     <!– PDF Export preset –>
                                    <value>Balanced</value>
                                    <value>-pacm</value>                    <!– PDF Export format –>
                                    <value>Pdfa_3a</value>
                                    <value>-ptem</value>                    <!– PDF Export text format –>
                                    <value>ImageOnText</value>
                                    <value>-f</value>                       <!– Output format –>
                                    <value>PDF</value>
                                    <value>-of</value>
                                    <value>${target}</value>
                                </list>
                            </entry>
                        </map>
                    </property>
                    <property name="errorCodes">
                       <value>1,2</value>
                    </property>
                 </bean>
              </property>
              <property name="explicitTransformations">
                 <list>
                    <bean class="org.alfresco.repo.content.transform.ExplictTransformationDetails">
                        <property name="sourceMimetype">
                            <value>image/tiff</value>
                        </property>
                        <property name="targetMimetype">
                            <value>application/pdf</value>
                        </property>
                    </bean>
                    <bean class="org.alfresco.repo.content.transform.ExplictTransformationDetails">
                        <property name="sourceMimetype">
                            <value>image/jpeg</value>
                        </property>
                        <property name="targetMimetype">
                            <value>application/pdf</value>
                        </property>
                    </bean>
                 </list>
              </property>
        </bean>
        <bean id="transformer.ocr.tiffjpeg" class="org.alfresco.repo.content.transform.ProxyContentTransformer" parent="baseContentTransformer">
            <property name="worker">
                <ref bean="transformer.worker.ocrabbyy.tiffjpeg" />
            </property>
        </bean>
</beans>
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Also, to use that transformer, you should set it's priority over the tiff2pdf from ImageMagick, or totally disable the ImageMagick one in case you don't wan't a failover transformer without OCR.

In /opt/alfresco-5.0.c/tomcat/shared/classes/alfresco-global.properties
Add the following lines (comment the one you don't want)


### Extension priority
content.transformer.ocr.tiffjpeg.priority=50
content.transformer.ImageMagick.extensions.tiff.pdf.supported=false
‍‍‍‍‍

Here you go, a fully working OCR transformer that wrapps ABBBYY OCR4Linux client into Alfresco.

Re: Content transformer for OCR ABBYY OCR4LINUX client

deajan — Thu, 23 Apr 2015 16:28:06 GMT

Just a note:
When declaring this transformer, viewing jpegs and tiffs in Alfresco automatically trigger a pdf conversion which uses the content transformer.
In the case of Abbyy OCR, a OCRed page is counted for every tiff / jpeg view.

topic Re: Content transformer for OCR ABBYY OCR4LINUX client in Alfresco Archive

Content transformer for OCR ABBYY OCR4LINUX client

Re: Content transformer for OCR ABBYY OCR4LINUX client

Re: Content transformer for OCR ABBYY OCR4LINUX client