Re: [tesseract-ocr] Image DPI restriction

[zbgns]

Actual DPI is unknown as it depends on various factors (inter alia physical 
dimensions of taken object and distance you took the picture from). The 
easiest way to establish real DPI is to take photo of a ruler and count 
number of pixels on 1 inch distance. As an example, there is approximately 
470DPI in case of picture taken from 18 cm with 12Mpixel camera (iphone 7).

W dniu poniedziałek, 11 czerwca 2018 17:28:47 UTC+2 użytkownik shree 
napisał:
>
> For better recognition 300 dpi is recommended.
>
> You can use a program like imagemagick to change dpi if needed.
>
>
> On Mon, Jun 11, 2018 at 8:30 PM Vidur Malhotra  > wrote:
>
>> Hi,
>> I was going through tesseract tutorials wherein it is mentioned that for 
>> Tesseract to do OCR, image should have alteast 300dpi. How is it possible? 
>> I tried capturing images from different phones (even iPhone 7plus), all of 
>> them are giving 72dpi.
>>
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>>  
>> 
>> .
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>>
>

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Re: [tesseract-ocr] Image DPI restriction

[Armando Ota]

use scanner

regards

Armando

On Mon, 11 Jun 2018, 17:00 Vidur Malhotra, 
wrote:

> Hi,
> I was going through tesseract tutorials wherein it is mentioned that for
> Tesseract to do OCR, image should have alteast 300dpi. How is it possible?
> I tried capturing images from different phones (even iPhone 7plus), all of
> them are giving 72dpi.
>
> --
> 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
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> To post to this group, send email to tesseract-ocr@googlegroups.com.
> 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/27329164-29c8-4686-8ca8-d2f70dc0dfa9%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

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Re: [tesseract-ocr] Image DPI restriction

[ShreeDevi Kumar]

For better recognition 300 dpi is recommended.

You can use a program like imagemagick to change dpi if needed.


On Mon, Jun 11, 2018 at 8:30 PM Vidur Malhotra 
wrote:

> Hi,
> I was going through tesseract tutorials wherein it is mentioned that for
> Tesseract to do OCR, image should have alteast 300dpi. How is it possible?
> I tried capturing images from different phones (even iPhone 7plus), all of
> them are giving 72dpi.
>
> --
> 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 tesseract-ocr+unsubscr...@googlegroups.com.
> To post to this group, send email to tesseract-ocr@googlegroups.com.
> 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/27329164-29c8-4686-8ca8-d2f70dc0dfa9%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

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[tesseract-ocr] Image DPI restriction

[Vidur Malhotra]

Hi,
I was going through tesseract tutorials wherein it is mentioned that for 
Tesseract to do OCR, image should have alteast 300dpi. How is it possible? 
I tried capturing images from different phones (even iPhone 7plus), all of 
them are giving 72dpi.

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