Warning. Invalid resolution 0 dpi. Using 70 instead

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Terry Bryant

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Feb 27, 2018, 9:23:00 AM2/27/18
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Hello everyone. I'm facing this above problem when my input image is the attached file.

My os:                  ubuntu14.04
My input image:   in attached file(which is a .png file)
My command:      tesseract 0a2d.png out

My output:            "Tesseract Open Source OCR Engine v4.00.00alpha with Leptonica
                             Warning. Invalid resolution 0 dpi. Using 70 instead.
                             Estimating resolution as 281
                             Empty page!!
                             Estimating resolution as 281
                             Empty page!!"

This engine is supposed to give the correct answer "0a2d".
I'm new to this ocr engine, so anyone can help me with this problem, many thanks:)
0a2d.png

ShreeDevi Kumar

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Feb 27, 2018, 12:08:37 PM2/27/18
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Which version of tesseract are you using?

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Terry Bryant

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Feb 27, 2018, 8:41:55 PM2/27/18
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Hi, it's "tesseract 4.00.00alpha
 leptonica-1.75.3
  libjpeg 8d (libjpeg-turbo 1.3.0) : libpng 1.2.50 : libtiff 4.0.3 : zlib 1.2.8"

On Wednesday, February 28, 2018 at 1:08:37 AM UTC+8, shree wrote:
Which version of tesseract are you using?
On 27-Feb-2018 7:52 PM, "Terry Bryant" <terry...@gmail.com> wrote:
Hello everyone. I'm facing this above problem when my input image is the attached file.

My os:                  ubuntu14.04
My input image:   in attached file(which is a .png file)
My command:      tesseract 0a2d.png out

My output:            "Tesseract Open Source OCR Engine v4.00.00alpha with Leptonica
                             Warning. Invalid resolution 0 dpi. Using 70 instead.
                             Estimating resolution as 281
                             Empty page!!
                             Estimating resolution as 281
                             Empty page!!"

This engine is supposed to give the correct answer "0a2d".
I'm new to this ocr engine, so anyone can help me with this problem, many thanks:)

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ShreeDevi Kumar

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Feb 27, 2018, 9:30:27 PM2/27/18
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try with --psm 6, 7 or 8, i get correct results with it

  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.


ShreeDevi
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भजन - कीर्तन - आरती @ http://bhajans.ramparivar.com

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Terry Bryant

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Feb 27, 2018, 10:33:45 PM2/27/18
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Could you please write down the command text? Cause my command is like "tesseract 0a2d.png out -psm 7", still don't have the right answer...

ShreeDevi Kumar

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Feb 27, 2018, 11:09:08 PM2/27/18
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Which traineddata file are you using? 

I am using the ones from tessdata_fast.

I will have to recheck the commands that I had used.

Usually it will be on the lines of

tesseract input.png outputbase --psm 6 --oem 1 -l langcode

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Terry Bryant

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Feb 27, 2018, 11:30:23 PM2/27/18
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Ok, thanks, I've got the answer!
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