What about: tesseract --help ;-) Zdenko
ut 23. 4. 2019 o 16:59 alex kelly <[email protected]> napísal(a): > Thanks for getting back to me. When i run it i get an error, any ideas > why and how to resolve it? > > pi@ShopFloorOCRReader:~ $ tesseract --psm 6 > "test_images/cropped_image.jpg" > Tesseract Open Source OCR Engine v3.04.01 with Leptonica > read_params_file: parameter not found: ���� > > > > On Sunday, 14 April 2019 10:59:53 UTC+1, Lorenzo Blz wrote: >> >> Hi Alex, >> you need to pre process the image a little. >> >> First negate it, tesseract expect dark on white background text. >> >> Then use --psm 6 to tell tesseract that this is a single block or text >> and not a complex page to split in paragraphs. Also try psm 7, single line. >> >> tesseract --psm 6 cropped_image.jpg - >> 1.4 95500>0 >> >> Now by stretching the contrast (or and OTSU/adaptive threshold) and >> straightening the image I get (almost) correct results, see the attached >> image. >> >> 1 4 9 55 0 5 >> >> Ideally you want an image as simple as possible, black text on white >> background. You may also try to crop the black border out, if possible. >> >> Have a look here on how to isolate blocks of text: >> >> >> https://www.pyimagesearch.com/2017/07/17/credit-card-ocr-with-opencv-and-python/ >> >> https://www.pyimagesearch.com/2017/02/20/text-skew-correction-opencv-python/ >> >> >> Bye >> >> Lorenzo >> >> >> >> Il giorno sab 13 apr 2019 alle ore 19:36 alex kelly <[email protected]> >> ha scritto: >> >>> Hello, >>> >>> I'm trying to OCR a small grey scale image, its for a energy meter but >>> it says the image is to small - the full response is below: >>> >>> pi@OCRReader:~ $ tesseract test_images/cropped_image.png out >>> Tesseract Open Source OCR Engine v3.04.01 with Leptonica >>> Error in pixGenerateHalftoneMask: pix too small: w = 230, h = 50 >>> Empty page!! >>> Error in pixGenerateHalftoneMask: pix too small: w = 230, h = 50 >>> Empty page!! >>> >>> How can I make tesseract-ocr read the value? >>> >>> I can send this to google computer vission API but i would rather do >>> this on the device (rather than sending it to the cloud) and I was >>> recommended tesseract. If there is a better solution, please let me >>> know. >>> >>> Thanks >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "tesseract-ocr" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at https://groups.google.com/group/tesseract-ocr. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/tesseract-ocr/2314d522-ac6d-4abc-8d17-42a198503b7d%40googlegroups.com >>> <https://groups.google.com/d/msgid/tesseract-ocr/2314d522-ac6d-4abc-8d17-42a198503b7d%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- > You received this message because you are subscribed to the Google Groups > "tesseract-ocr" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/tesseract-ocr. > To view this discussion on the web visit > https://groups.google.com/d/msgid/tesseract-ocr/455d9579-a476-4d85-b6d3-ca1c34853c2b%40googlegroups.com > <https://groups.google.com/d/msgid/tesseract-ocr/455d9579-a476-4d85-b6d3-ca1c34853c2b%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tesseract-ocr. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/CAJbzG8wMU-v%2B-2AMKW2yq8W-VK_kDoJ4eT5gy4KHX43uUwQx6w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
