[New] Make RPA/recognition/ocr return actual confidence#139
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[New] Make RPA/recognition/ocr return actual confidence#139
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We used the terms "confidence" and "coincidence", which are ambiguous
and used inconsistently:
* When using tesseract, only "confidence" is used, and it refers to the
similarity between the text that it tries to find and the text that
was returned by OCR.
* When using RapidOCR:
* "confidence" refers to the confidence score returned by RapidOCR,
which is the model's estimated probability that the returned text is
actually what is visible in the image.
* "coincidence" refers to the same which "confidence" refers to in
tesseract: the similarity between the text that we try to find and
the text that was returned by OCR
* In the matches dictionaries returned by find_text, the confidence item
always refers to the text similarity, even when using RapidOCR, where
the coincidence argument is used for that.
* For RapidOCR, the "confidence" value is a fraction (between 0 and 1),
for the other values we use percentage (between 0 and 100).
We now consistently use:
* "similarity" for text similarity
* "confidence" for the OCR confidence score (only returned by RapidOCR)
* Percentage (0 to 100) for all similarity and confidence values.
The module only returned similarity but tesseract does actually also return confidence values, we just have to use it.
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Merged into #138 because without this change, the other PR wouldn't have 100% coverage |
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Description
The
yarf/vendor/RPA/recognition/ocr.pymodule only returned similarity but tesseract does actually also return confidence values, we just have to use it.Tests
The module doesn't have any tests as far as I can see and I didn't add any.
Important
This is based on #138, please review that PR first.