I noticed it is in TessBaseAPI::Recognize
int TessBaseAPI::Recognize(struct ETEXT_STRUCT* monitor) {
//...
if (thresholder_ == NULL || thresholder_->IsEmpty()) {
tprintf("Please call SetImage before attempting recognition.");
return -1;
}
//...
}
My input image is coded binary, single char, how may I fix the
thresholder problem? Thanks for help.
zl2k
On Apr 14, 9:20 am, zl2k <[email protected]> wrote:
> I block the Recognize but still get the same error. Other comments?
>
> On Apr 14, 5:23 am, Leonardo Gomes <[email protected]> wrote:
>
>
>
>
>
>
>
> > I'm a newbie with Tesseract, but I know that api.GetUTF8Text() calls
> > Recognize for you. Try removing the call to Recognize to see what happens.
>
> > Cheers,
> > Leo.
>
> > On Thu, Apr 14, 2011 at 7:58 AM, zl2k <[email protected]> wrote:
> > > hi, all
>
> > > I have composed a Pix image and here are the 4 lines of code to
> > > recognize the input image (I am using tesseract 3.00)
>
> > > tesseract::TessBaseAPI api;
> > > // construct pix_image
> > > api.SetImage(pix_image);
> > > api.SetRectangle(0, 0, pixGetWidth(pix_image),
> > > pixGetHeight(pix_image));
> > > api.Recognize(NULL);
> > > std::string result = api.GetUTF8Text();
>
> > > The code compiles fine but got the following runtime error:
> > > Please call SetImage before attempting recognition.Please call
> > > SetImage before attempting recognition.terminate called after throwing
> > > an instance of 'std::logic_error'
> > > what(): basic_string::_S_construct NULL not valid
> > > Aborted
>
> > > Could you give me some hint on how to fix the problem? Thanks for
> > > help.
>
> > > zl2k
>
> > > --
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