public float getUnmappedUnicodeCharsPerPage() {
            return unmappedUnicodeCharsPerPage;
        }
Encapsulate the numbers used to control OCR Strategy when set to auto
<p>
If the total characters on the page < this.totalCharsPerPage
or
total unmapped unicode characters on the page > this.unmappedUnicodeCharsPerPage
then we will perform OCR on the page
<p>
If unamppedUnicodeCharsPerPage is an integer > 0, then we compare absolute number of characters.
If it is a float < 1, then we assume it is a percentage and we compare it to the
percentage of unmappedCharactersPerPage/totalCharsPerPage
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-pdf-module/src/main/java/org/apache/tika/parser/pdf/PDFParserConfig.java