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POcharacter-wise confidence values using tesseract 3.01
 

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  1. POcharacter-wise confidence values using tesseract 3.01
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    <p>i executed the following code to generate character-wise confidence values:</p> <pre><code>int main(int argc, char **argv) { const char *lang="eng"; const PIX *pixs; if ((pixs = pixRead(argv[1])) == NULL) { cout &lt;&lt;"Unsupported image type"&lt;&lt;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-&gt;GetUTF8Text(RIL_SYMBOL); if(symbol != 0) { float conf = ri-&gt;Confidence(RIL_SYMBOL); cout&lt;&lt;"\nnext symbol: "&lt;&lt; symbol &lt;&lt; " confidence: " &lt;&lt; conf &lt;&lt;"\n" &lt;&lt;endl; } delete[] symbol; } while((ri-&gt;Next(RIL_SYMBOL))); } return 0; } </code></pre> <p><a href="http://www.google.com/imgres?hl=en&amp;client=ubuntu&amp;hs=oYw&amp;sa=X&amp;channel=fs&amp;biw=1848&amp;bih=947&amp;tbm=isch&amp;prmd=imvnso&amp;tbnid=9rXmU4v9Lv-05M%3a&amp;imgrefurl=http://www.sostars.com/nb-strange-font/&amp;docid=tR10YRmNr592bM&amp;imgurl=http://www.sostars.com/wp-content/uploads/2009/02/nb-strange.jpg&amp;w=477&amp;h=144&amp;ei=pU_gT8z2F8O4rAeXo8iEDQ&amp;zoom=1&amp;iact=rc&amp;dur=290&amp;sig=107305962295400674833&amp;page=1&amp;tbnh=57&amp;tbnw=189&amp;start=0&amp;ndsp=54&amp;ved=1t:429,r:29,s:0,i:165&amp;tx=61&amp;ty=26" rel="nofollow">link to image</a></p> <p>the output obtained for the above image was:</p> <blockquote> <p>next symbol: N confidence: 72.3563 next symbol: B confidence: 72.3563 </p> <p>next symbol: E confidence: 69.9937 next symbol: T confidence: 69.9937<br> next symbol: R confidence: 69.9937 next symbol: A confidence: 69.9937<br> next symbol: N confidence: 69.9937 next symbol: G confidence: 69.9937<br> next symbol: - confidence: 69.9937 next symbol: I confidence: 69.9937 </p> </blockquote> <p>As is evident, the confidence values for characters belonging to the same word is the same. Is this the expected output? Shouldn't the confidence values be different for each character? I tried executing the code for a word in which each character was in different font style..and yet, the confidence value was the same for characters belonging to the same word.</p>
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