Hi,
I think you will need to run training for this. I tried simple c++ code
that show confidence values (see attachment) and for your digit 6 it
produced:
symbol 5, conf: 78.5236 ---- 5 conf: 78.523613
---- s conf: 77.376984
---- a conf: 71.858353
---- B conf: 66.046341
It produces recognized symbol ("5") with its confidence value + there are
results from Choice iterator with confidence values. "6" is not there...
If I interpret it correctly you can not expect that current English
language data file will recognize "your" "6" as "6".
Zdenko
On Fri, Jan 11, 2013 at 12:09 AM, sunitha raghurajan <
[email protected]> wrote:
> Yes, this is NH license plate. The first image is with out pre processing
> and the second one is after processing through opencv.
>
>
>
> On Tuesday, January 8, 2013 12:58:19 PM UTC-5, zdenop wrote:
>>
>> On 08.01.2013 17:13, sunitha raghurajan wrote:
>> > I am using Tesseract to read license plate. The tesseract is giving
>> wrong
>> > output for digit six. My question is, Can I train the tesseract for
>> single
>> > digit 'six'. Any help truly appreciated.
>> >
>> Can you post a example of image (with digit 6) that you try to recognize?
>>
>
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/*
$ g++ -o test_char_conf_2 test_char_conf_2.cpp -ltesseract -llept
$ ./test_char_conf_2
*/
#include "leptonica/allheaders.h"
#include "tesseract/baseapi.h"
int main() {
const char *language = "eng";
const char *datapath = "/usr/src/tesseract-3.02/";
PIX *pixs;
bool indent;
const char *image = "image3.tif";
if ((pixs = pixRead(image)) == NULL) {
printf("Unsupported image type.\n");
exit(3);
}
tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
api->Init(datapath, language, tesseract::OEM_DEFAULT);
api->SetVariable("save_blob_choices", "T");
//api->SetVariable("tessedit_char_whitelist", "0123456789");
api->SetImage(pixs);
api->Recognize(NULL);
tesseract::ResultIterator* ri = api->GetIterator();
tesseract::PageIteratorLevel level = tesseract::RIL_SYMBOL;
if (ri != 0) {
do {
int left, top, right, bottom;
ri->BoundingBox(level, &left, &top, &right, &bottom);
printf("box l:%i b:%i r:%i t:%i\n", left, bottom, right, top);
const char* symbol = ri->GetUTF8Text(level);
float conf = ri->Confidence(level);
if (symbol != 0) {
printf("\tsymbol %s, conf: %.4f ", symbol, conf);
indent = false;
tesseract::ChoiceIterator ci(*ri);
do {
if (indent) printf("\t\t\t\t");
printf("----");
const char* choice = ci.GetUTF8Text();
printf("\t\t%s conf: %f\n", choice, ci.Confidence());
indent = true;
} while (ci.Next());
}
delete[] symbol;
} while ((ri->Next(level)));
}
api->End();
pixDestroy(&pixs);
return 0;
}
