I am using /MT lib binaries and your code crashes on
it->Orientation(&orientation, &direction, &order, &deskew_angle);
Any idea what is wrong?
Thanks,
Mikayel
On Monday, November 19, 2012 at 12:27:20 AM UTC+4, zdenop wrote:
>
> Hi all,
>
> you will not get OSD (Orientation and script detection) output information
> with tesseract executable. At the moment tesseract provide (save) only ocr
> result. Somebody could consider help (tesseract --help) misleading because
> it enumerate all possible page segmentation modes. I think that starting
> with other than 0 psm would also trigger question...
>
> OSD info you get via API. Here is simple snippet:
>
> inputfile = "/usr/src/tesseract-3.02/eurotextUpsideDown.png";
>
> image = pixRead(inputfile);
>
>
> api->Init("/usr/src/tesseract-3.02/", "eng");
>
> api->SetPageSegMode(tesseract::PSM_AUTO_OSD);
>
> api->SetImage(image);
>
> api->Recognize(0);
>
>
> tesseract::PageIterator* it = api->AnalyseLayout();
>
> tesseract::Orientation orientation;
>
> tesseract::WritingDirection direction;
>
> tesseract::TextlineOrder order;
>
> float deskew_angle;
>
>
> it->Orientation(&orientation, &direction, &order, &deskew_angle);
>
> printf("Orientation: %d;\nWritingDirection: %d\nTextlineOrder: %d\n" \
>
> "Deskew angle: %.4f\n",
>
> orientation, direction, order, deskew_angle);
>
>
> In output you can see these information(eurotextUpsideDown.png is 180
> degree rotated image eurotext.tif):
>
> Orientation: 2;
>
> WritingDirection: 0
>
> TextlineOrder: 2
>
> Deskew angle: -0.0038
>
>
> This means that page is upside down (Orientation)[1], text is written from
> left to right (WritingDirection)[2], lines are ordered from top to down
> (TextlineOrder)[3], and there is small deskew angle[4].
>
> As you can see attributes WritingDirection, TextlineOrder, Deskew do not
> reflect that page is upside down, so you will get the same result for
> eurotext.tif.
>
>
> [1]
> http://code.google.com/p/tesseract-ocr/source/browse/trunk/ccstruct/publictypes.h?r=716#81
>
> [2]
> http://code.google.com/p/tesseract-ocr/source/browse/trunk/ccstruct/publictypes.h?r=716#111
>
> [3]
> http://code.google.com/p/tesseract-ocr/source/browse/trunk/ccstruct/publictypes.h?r=716#125
>
> [4]
> http://code.google.com/p/tesseract-ocr/source/browse/trunk/ccmain/pageiterator.h?r=716#239
>
> --
> Zdenko
>
> On Tue, Nov 13, 2012 at 10:26 AM, Alex <[email protected]
> <javascript:>> wrote:
>
>> Hello,Chirag.
>>
>> I am also trying to find a way to detect the script of the input
>> document.
>>
>> Kindly let me know if you have some progress.
>>
>> Thanks and Regards,
>> Alex
>>
>>
>>
>> 在 2012年3月14日星期三UTC+8下午7时17分29秒，Chirag Jain写道：
>>>
>>> With -psm 3, I got non-empty files (test_osd.txt) which were empty with
>>> -psm 0. This is true for both with/without -l options.
>>>
>>> However, the results of detectOS is same for both -psm [0/3] option for
>>> any of with/without -l options.
>>>
>>> Please note that I have modified the code slightly to call detectOS
>>> separately, which has been doing a good job for orientation detection given
>>> script. I am struggling to detect the script of the input document.
>>>
>>> Regards,
>>> Chirag
>>>
>>>
>>> On Wed, Mar 14, 2012 at 4:05 PM, Sriranga(78yrsold) <[email protected]
>>> > wrote:
>>>
>>>> one more important - please test again as follows:
>>>> 1st test:tesseract.exe japanese_doc.tif test_osd -l jpn -psm 3
>>>> 2nd test:tesseract.exe japanese_doc.tif test_osd -psm 3
>>>> Please check the output text files "test_osd" - you will find
>>>> difference in script between two.
>>>>
>>>> On Wed, Mar 14, 2012 at 3:51 PM, Sriranga(78yrsold) <
>>>> [email protected]> wrote:
>>>>
>>>>> I noticed "-l lang" before "-psm 0" is missing in your commandline.
>>>>> In the absence of "-l lang" tesseract will always assume as "-l eng".
>>>>>
>>>>>
>>>>> extract of help is reproduced below:
>>>>>
>>>>> M:\>tesseract.exe -h
>>>>> *Usage:tesseract.exe imagename outputbase [-l lang] [-psm pagesegmode]
>>>>> [configfil*
>>>>> e...]
>>>>> pagesegmode values are:
>>>>> 0 = Orientation and script detection (OSD) only.
>>>>> 1 = Automatic page segmentation with OSD.
>>>>> 2 = Automatic page segmentation, but no OSD, or OCR
>>>>> 3 = Fully automatic page segmentation, but no OSD. (Default)
>>>>> 4 = Assume a single column of text of variable sizes.
>>>>> 5 = Assume a single uniform block of vertically aligned text.
>>>>> 6 = Assume a single uniform block of text.
>>>>> 7 = Treat the image as a single text line.
>>>>> 8 = Treat the image as a single word.
>>>>> 9 = Treat the image as a single word in a circle.
>>>>> 10 = Treat the image as a single character.
>>>>> -l lang and/or -psm pagesegmode must occur before anyconfigfile.
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Mar 14, 2012 at 3:22 PM, Chirag <[email protected]> wrote:
>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> I was able to successfully test orientation detection (after stepping
>>>>>> though the code) for various scripts using following commands:
>>>>>>
>>>>>> English: tesseract.exe english_doc.tif test_osd -l eng -psm 0
>>>>>> Japanese: tesseract.exe japanese_doc.tif test_osd -l jpn -psm 0
>>>>>> Korean: tesseract.exe korean_doc.tif test_osd -l kor -psm 0
>>>>>>
>>>>>> In these cases, the executable search for eng.traineddata,
>>>>>> jpn.traineddata and kor.traineddata respectively along with
>>>>>> osd.traineddata.
>>>>>>
>>>>>> The performance is really good.
>>>>>>
>>>>>>
>>>>>> However, it seems like Tesseract is detecting orientation given
>>>>>> script.
>>>>>>
>>>>>>
>>>>>> If I run the executable as following:
>>>>>>
>>>>>> Japanese: tesseract.exe japanese_doc.tif test_osd -psm 0
>>>>>> Korean: tesseract.exe korean_doc.tif test_osd -psm 0
>>>>>>
>>>>>> The results are not good. It seems like script detection is not
>>>>>> robust.
>>>>>>
>>>>>> Am I missing some step? Kindly clarify.
>>>>>>
>>>>>>
>>>>>> Regards,
>>>>>> Chirag
>>>>>>
>>>>>>
>>>>>> On Sat, Mar 3, 2012 at 7:12 PM, koray <[email protected]>
>>>>>> wrote:
>>>>>>
>>>>>>> OSD returns emty text when I tried. Can anyone please clarify if
>>>>>>> this is a bug or I m doing things wrong?
>>>>>>>
>>>>>>> --
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>>>>>>>
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>>>>>>>
>>>>>>
>>>>>>
>
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