Support monitoring OCR process

[FabriceChaverot]

For a real time application I need timeout fonctionnalities because sometimes I have OCR times upper than 1.5 seconds. I have seen in Tesseract wrapper this code:

   private void Recognize()
    {            
        if (!runRecognitionPhase) {
            if (Interop.TessApi.BaseApiRecognize(Engine.Handle, new HandleRef(this, IntPtr.Zero)) != 0) {
                throw new InvalidOperationException("Recognition of image failed.");
            }
            runRecognitionPhase = true;
        }
    }

the second parameter in TessApiBaseApiRecognize is a monitor structure which has a timeout parameter, I have looked at the C++ code Tesseract and I have found this structure:

class ETEXT_DESC { // output header public: inT16 count; // chars in this buffer(0) inT16 progress; // percent complete increasing (0-100) inT8 more_to_come; // true if not last volatile inT8 ocr_alive; // ocr sets to 1, HP 0 inT8 err_code; // for errcode use CANCEL_FUNC cancel; // returns true to cancel void* cancel_this; // this or other data for cancel struct timeval end_time; // time to stop. expected to be set only by call // to set_deadline_msecs() EANYCODE_CHAR text[1]; // character data

ETEXT_DESC() : count(0), progress(0), more_to_come(0), ocr_alive(0), err_code(0), cancel(NULL), cancel_this(NULL) { end_time.tv_sec = 0; end_time.tv_usec = 0; }

which is what they call the monitor

Is it possible to have this fonctionnality in the .net wrapper ?

[charlesw]

Should be possible in theory however I've got my hands full with the upcoming 3.03 release and my other priorities. If you want to feel free to give implementing this a go. On 8 Aug 2014 17:26, "FabriceChaverot" notifications@github.com wrote:

For a real time application I need timeout fonctionnalities because sometimes I have OCR times upper than 1.5 seconds. I have seen in Tesseract wrapper this code:

private void Recognize() { if (!runRecognitionPhase) { if (Interop.TessApi.BaseApiRecognize(Engine.Handle, new HandleRef(this, IntPtr.Zero)) != 0) { throw new InvalidOperationException("Recognition of image failed."); } runRecognitionPhase = true; } }

the second parameter in TessApiBaseApiRecognize is a monitor structure which has a timeout parameter, I have looked at the C++ code Tesseract and I have found this structure:

class ETEXT_DESC { // output header public: inT16 count; // chars in this buffer(0) inT16 progress; // percent complete increasing (0-100) inT8 more_to_come; // true if not last volatile inT8 ocr_alive; // ocr sets to 1, HP 0 inT8 err_code; // for errcode use CANCEL_FUNC cancel; // returns true to cancel void* cancel_this; // this or other data for cancel struct timeval end_time; // time to stop. expected to be set only by call // to set_deadline_msecs() EANYCODE_CHAR text[1]; // character data

ETEXT_DESC() : count(0), progress(0), more_to_come(0), ocr_alive(0), err_code(0), cancel(NULL), cancel_this(NULL) { end_time.tv_sec = 0; end_time.tv_usec = 0; }

which is what they call the monitor

Is it possible to have this fonctionnality in the .net wrapper ?

— Reply to this email directly or view it on GitHub https://github.com/charlesw/tesseract/issues/112.

[jay-hill]

I've implemented the ability to specify a timeout for the OCR process (without support for monitoring). Would it be worthwhile to put this feature into a pull request? The changes to the API were very minor (they are checked into the add-timeout branch on my page)

[charlesw]

Yes, any pull requests are welcome ;)

Note that while changes to the API are fine they should be backwards compatible (e.g. overload methods instead of just adding parameters etc).

On Mon, 3 Oct 2016, 23:37 jay-hill, notifications@github.com wrote:

I've implemented the ability to specify a timeout for the OCR process (without support for monitoring). Would it be worthwhile to put this feature into a pull request? The changes to the API were very minor (they are checked into the add-timeout branch on my page)

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/charlesw/tesseract/issues/112#issuecomment-251234846, or mute the thread https://github.com/notifications/unsubscribe-auth/AAPzyM-n_JefZYaCjMmwu70f-HYLfltAks5qwXWegaJpZM4CVZFT .