Significant confidence values ​​using tesseract 3.01

Question

i executed the following code to generate significant confidence values:

int main(int argc, char **argv) { const char *lang="eng"; const PIX *pixs; if ((pixs = pixRead(argv[1])) == NULL) { cout <<"Unsupported image type"<<endl; exit(3); } TessBaseAPI api; api.SetVariable("save_blob_choices", "T"); api.SetPageSegMode(tesseract::PSM_SINGLE_WORD ); api.SetImage(pixs); int rc = api.Init(argv[0], lang); api.Recognize(NULL); ResultIterator* ri = api.GetIterator(); if(ri != 0) { do { const char* symbol = ri->GetUTF8Text(RIL_SYMBOL); if(symbol != 0) { float conf = ri->Confidence(RIL_SYMBOL); cout<<"\nnext symbol: "<< symbol << " confidence: " << conf <<"\n" <<endl; } delete[] symbol; } while((ri->Next(RIL_SYMBOL))); } return 0; } 

image link

the result obtained for the above image:

next character: N certainty: 72.3563 next character: B trust: 72.3563

next character: E certainty: 69.9937 next character: T certainty: 69.9937
next symbol: R certainty: 69.9937 next symbol: certainty: 69.9937
next character: N certainty: 69.9937 next character: G certainty: 69.9937
next character: - confidence: 69.9937 next character: I'm sure: 69.9937

As you can see, the confidence values ​​for the characters of the same word are the same. Is this the expected result? Shouldn't the trust values ​​for each character be different? I tried to execute code for a word in which each character was in a different font style. Nevertheless, the confidence value was the same for characters belonging to one word.

Answer 1

The problem is that you are calling Init after calling SetVariable.