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Recognition being run even when disabled #769

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Balearica opened this issue May 29, 2023 · 1 comment
Closed

Recognition being run even when disabled #769

Balearica opened this issue May 29, 2023 · 1 comment

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@Balearica
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Tesseract.js skips the recognition step when all of the output formats requested do not require recognition. This allows for using Tesseract.js for image processing without waiting for recognition (the step with the longest runtime) to be completed. This behavior will also be critical if we add a way to get layout data without running recognition (requested in #656).

tesseract.js/src/worker-script/index.js

Lines 355 to 359 in 15fdd9e

if (recOutputCount > 0) {
api.Recognize(null);
} else {
log('Skipping recognition: all output options requiring recognition are disabled.');
}

Unfortunately, this does not appear to be working correctly at present--recognition is still being run even when we intentionally skip running api.Recognize. It looks like something in the dump function is triggering Tesseract to automatically run recognition under the hood.
@Balearica Balearica mentioned this issue May 29, 2023
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@Balearica
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Balearica commented May 29, 2023 •
edited

The cause ended up being the api.MeanTextConf function, which was always run by dump and appears to automatically trigger recognition.

tesseract.js/src/worker-script/utils/dump.js

Line 215 in b23ebf3

confidence: api.MeanTextConf(),

Resolved by #770. Will be included in next release.

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@Balearica