Cannot use OCR

[darkdoctor]

Hello to all.

I just downloaded the example and did:

• npm install
• npm link
• react-native link

also, I had an issue because the mainapplication.java inside of library was overriding a method which does not derive from superclass, I just commented override keyword so i can compile it.

The below code never executes .then(result) or .catch(err)
RNTesseractOcr.recognize(path, 'LANG_ENGLISH', tessOptions) .then((result) => { this.setState({ isLoading: false, ocrResult: result }); console.log('OCR Result: ', result); }) .catch((err) => { console.log('OCR Error: ', err); }) .done();

but when i change 'LANG_ENGLISH' to "eng" then it throws an error Attempt to invoke virtual method 'java.lang.String ljava.lang.Object.toString()' on a null object reference.

Also, I want to use only ocr in english so i have copied eng.traindata in assets folder only and it does exists on my phone when i check.

Also, even if i get result sometime, it takes around 5 minutes and there are only random words that dont have to do anything with the content i have scanned.

(OCR Result: .. ‘I
”wilmwlgi‘yl I I I “IIIIIII‘I II
.. I. mgfuaslig‘IM . I‘ I In IIIII I
I MIMI?” fig I I ‘I’IIIIIIIIIIIEI‘SIIIIIIIIIéégis .
I ,M . . Hi I ~ I IIII’IfiEIIIsr‘II‘EIiM’IrféIgiii‘g‘ésifiéfié§I I I I
aIIIIIIIIIIIIIII I IIIIIIIs’.‘””Igugsigggfi II I I I I
I WazéiwifszInciIrIIIIIIIIIu.uI I I II‘I‘II"II““‘I‘II‘IIIIIII
‘ IIIIHI‘III II IIIII“II‘“IIIIIIIIIIIIIj
I III “ ‘ ““III“IIIIIagézeiZIfMII.’I
II ‘q?IffiWIIIIIgr.I I u I . W“IgIiifigggémiigzgyngagaitj,’
I w I I “‘IIII’IIIIIITIIII I IIIIIIIIIIIIIIIIIIIIIIIIIII I
lngIQEIIIIIM..?§£? ZIIIIEI’I ‘ ‘ EQIIEIZQ“II.IIE‘,IIII TV,“ I j I ‘ ~ . I “III VIIIIIIIIIIIIIIIIIII I I IIIIIIIIIIIIIIII I
wagifIze“ my hf‘ng‘iflfiffiiu mo‘ IiIIIIIIIIm‘EHIIiI‘II.jIw ’ I ‘i’ ‘ “I ”I ‘ ‘ i ‘ II’leiIIfliIIIII I I j “I IIIIII‘IIIIIIIIIIIIIC“ ..
I i‘lfim‘l’m”~ M I I I I I I I I I I I I I IIIIIIIIIIIIII I IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII I
“I III“???MI,”I .. I , I I I IIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIII
‘ W IIIII‘IIIIIIIIIs I I I I I IIIIIIIIIIIIIIIIIIIIII I ’ IIIIIIIIIIIIIIIIIII
,I.»zgisz‘i‘IIIéIIIIiI MI.“IIIIIIIIIIIIIIIIiiivx’ifl“ ‘ ‘ I I ‘I”IIIIIJIIIIIIIII. .II IIIIIIIIIIIIIIIIIIIIIIIII
W III” "iIIIIIIIIIIIIIII”III . ,IIIIII III‘II IIIIIIIIIIII,
” ‘ “I’“““‘““IIIIII“IIIIIII IIIIIIIII ff‘fI‘gIII I IIIIIIIIIIIIIIIIIW ‘ ‘ W‘IIIIIII III I I IIIIIIII
‘ “III I IIIIIIIIII I... “I I IIIIMIII I. I MI‘III, II MsIz‘IzImzi‘ .
U “I’ I ‘ .“I .w I IIIIIIIIIIJ M ‘I‘IIMII‘IIIIII , IiIIIIIIIIMIIIMI,I
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j WINSmy ‘ I lie IIEIII ’gIe IIIMIII “‘n M I I i“i II?“ III LII III‘I‘ . M
I‘“I““‘IIIIIIIIIII II I I III II“ . II IIIIIIIIIIIIfinal’
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s‘a Ii“ IIIIII‘IIIIIIEIIIIIIIiIIIIiI”r I ’I II ,...» IIIIIIjIIIIIu .‘wII I I ‘ IIII‘II III I“ IIII‘MI‘II‘MI ‘ IIEIIIIIIIi‘IziIIJIIr. I
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[jonathanpalma]

Hey @darkdoctor

I'm sorry for taking so long to answer but I've been pretty busy with some work stuffs.

but when i change 'LANG_ENGLISH' to "eng" then it throws an error Attempt to invoke virtual method 'java.lang.String ljava.lang.Object.toString()' on a null object reference.

This module only supports the languages previously defined on the Usage section. (But yes, I should have a look at the exception that is being throwed)

The below code never executes .then(result) or .catch(err)
RNTesseractOcr.recognize(path, 'LANG_ENGLISH', tessOptions) .then((result) => { this.setState({ isLoading: false, ocrResult: result }); console.log('OCR Result: ', result); }) .catch((err) => { console.log('OCR Error: ', err); }) .done();
...
Also, even if i get result sometime, it takes around 5 minutes and there are only random words that dont have to do anything with the content i have scanned.

I have identified this is caused because when we process an image that was taken from our cellphone camera, the picture tends to has a big file size and because of this the ocr processor usually gets stuck. In order to fix that we should work on a solution to check the file size before use inSampleSize considering that when it is used (usually to save memory) the ocr quality decreases.

[stale]

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