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Posted to dev@tika.apache.org by "Hong-Thai Nguyen (JIRA)" <ji...@apache.org> on 2014/10/13 10:57:34 UTC
[jira] [Commented] (TIKA-1445) Figure out how to add Image metadata
extraction to Tesseract parser
[ https://issues.apache.org/jira/browse/TIKA-1445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14169090#comment-14169090 ]
Hong-Thai Nguyen commented on TIKA-1445:
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Interesting question !
For me, parser's selection and parsers priority decision should be done on runtime by configuration, not inside a parser.
Image's parser is an interesting case of concurrent parsers (Tesseract vs classical Image Parsers). We have double problem here:
1. When many parsers can work with same mime type, which one is selected ?
2. When we have many parsers, can we apply many parsers and merge results (metadata & handler) .
* For case 1, if we use a override config of parsers on runtime, we can declare many parsers with matching mimetype and the later one in list will be selected. We may extend CLI/WebService to inject this kind of configuration.
* For case 2, we don't have a solution for now. We may extend CompositeParser to accept a mode 'many' parsers and call matching parsers in chain. The merging result is an other problem.we can accept a same metadata name is override by an other parser. The perfect solution is (again) using nested structure on our metadata which enable store each parser's result.
> Figure out how to add Image metadata extraction to Tesseract parser
> -------------------------------------------------------------------
>
> Key: TIKA-1445
> URL: https://issues.apache.org/jira/browse/TIKA-1445
> Project: Tika
> Issue Type: Bug
> Components: parser
> Reporter: Chris A. Mattmann
> Assignee: Chris A. Mattmann
> Fix For: 1.7
>
> Attachments: TIKA-1445.Mattmann.101214.patch.txt
>
>
> Now that Tesseract is the default image parser in Tika for many image types, consider how to add back in the metadata extraction capabilities by the other Image parsers.
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