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] > <javascript:>> 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] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> 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. For more options, visit https://groups.google.com/d/optout.
