*Hello , I am a foreign tesseract novice. I need your help, the following 
is google translate .*

In the tesseract command line, there is an option called "--dpi", I don't 
understand what this option does. 
I found that modifying the "--dpi" option will make the ocr result of the 
same image different. 
I understand the meaning of the dpi option (one inch The number of inner 
pixels). 

So, I have the following questions: 
1.  I pass in the same picture, the number of pixels is the same, why does 
changing the --dpi affect the ocr result? ( Is this dpi The option is to 
control the zoom of the input image? Will the same image have different ocr 
results under different zoom ratios? )
2 . How should I fill in the appropriate value for this option "--dpi" ?
3 . The height of the text in my image is only about 14px , Will this text 
size be too small, resulting in low ocr accuracy? I can try to use resize 
in opencv to enlarge the picture, but the picture clarity has not changed, 
will this improve the quality of ocr?

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