Tesseract character recognition and C++

Question

I read single characters with C++ and tesseract/leptonica. Below is chunk I use.

is it possible to improve accuracy to use some special function, in case if I read only one character. Of course I have openCV mat with cropped image to fit the character size.

char *outText1;

          tesseract::TessBaseAPI *api1 = new tesseract::TessBaseAPI();

           if (api1->Init(NULL, "eng")) {
           fprintf(stderr, "Could not initialize tesseract.\n");
           exit(1); }

           api1->SetImage((uchar*)imgWarpCopy1.data, imgWarpCopy1.size().width, imgWarpCopy1.size().height, imgWarpCopy1.channels(), imgWarpCopy1.step1());

           outText1 = api1->GetUTF8Text();

           int temp1 = strlen(outText1);

           string_read = outText1[temp1-3];
           api1->End();
           delete api1;
           delete [] outText1;