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https://issues.apache.org/jira/browse/TIKA-2038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15390603#comment-15390603
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Shabanali Faghani commented on TIKA-2038:
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Thanks, Tim! I agree with you that icu4j is better than mozilla in general, but
there are [some
points|http://stackoverflow.com/questions/499010/java-how-to-determine-the-correct-charset-encoding-of-a-stream/37196594#37196594]
about them that should be noted.
Unfortunately, I didn’t compare the results of my algorithm against the
charsets in meta tags. I think estimating the ratio of HTML documents with
wrong charset in meta tags is almost impossible, because as I’ve explained in
page 11 of [my
paper|http://link.springer.com/chapter/10.1007/978-3-319-28940-3_17],
determining if a charset is valid to decode a document is very hard for large
collections.
> A more accurate facility for detecting Charset Encoding of HTML documents
> -------------------------------------------------------------------------
>
> Key: TIKA-2038
> URL: https://issues.apache.org/jira/browse/TIKA-2038
> Project: Tika
> Issue Type: Improvement
> Components: core, detector
> Reporter: Shabanali Faghani
> Priority: Minor
>
> Currently, Tika uses icu4j for detecting charset encoding of HTML documents
> as well as the other naturally text documents. But the accuracy of encoding
> detector tools, including icu4j, in dealing with the HTML documents is
> meaningfully less than from which the other text documents. Hence, in our
> project I developed a library that works pretty well for HTML documents,
> which is available here: https://github.com/shabanali-faghani/IUST-HTMLCharDet
> Since Tika is widely used with and within some of other Apache stuffs such as
> Nutch, Lucene, Solr, etc. and these projects are strongly in connection with
> the HTML documents, it seems that having such an facility in Tika also will
> help them to become more accurate.
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