Try OCR on inverted line only if mean confidence is below 50 %

The old code looked for the minimum confidence which triggered very often a 2nd OCR without improving the result. Signed-off-by: Stefan Weil <[email protected]>
tesseract-ocr · Oct 26, 2020 · cfb1fb2 · cfb1fb2
1 parent 11297c9
commit cfb1fb2
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/src/lstm/lstmrecognizer.cpp b/src/lstm/lstmrecognizer.cpp
@@ -2,7 +2,6 @@
 // File:        lstmrecognizer.cpp
 // Description: Top-level line recognizer class for LSTM-based networks.
 // Author:      Ray Smith
-// Created:     Thu May 02 10:59:06 PST 2013
 //
 // (C) Copyright 2013, Google Inc.
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -291,7 +290,7 @@ bool LSTMRecognizer::RecognizeLine(const ImageData& image_data, bool invert,
   // Check for auto inversion.
   float pos_min, pos_mean, pos_sd;
   OutputStats(*outputs, &pos_min, &pos_mean, &pos_sd);
-  if (invert && pos_min < 0.5) {
+  if (invert && pos_mean < 0.5) {
     // Run again inverted and see if it is any better.
     NetworkIO inv_inputs, inv_outputs;
     inv_inputs.set_int_mode(IsIntMode());