Removing colors

[Deepak Sharma]

I am trying to preprocess resumes for building an OCR model. Please refer to the reference image attached in this message. 

As you can see, under the skills section, all the skills are surrounded by bluish green patch. I need help with how to remove those colors from the image?

Ideally, after preprocessing, the image should be just white(background) with black text

[Balasundaram Chinnaiyan]

convert the image to grayscale  and remove the gray .

or use HSV colour code to remove it.

Regards,

Bala

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[Zdenko Podobny]

try to play with the leptonica pixAutoPhotoinvert function[1].

quick test with following C code snippets provided attached result:

pix = leptonica.pixRead("des_resume3.png");

pix1 = leptonica.pixThresholdToBinary(pix, 170);

autoinverted = pixAutoPhotoinvert(pix1, thresh, NULL, NULL);

pixWrite("autoinverted.png", autoinverted, IFF_PNG);

[1] https://github.com/DanBloomberg/leptonica/blob/f7a4bdc48f54c973e6b7c47b9181ac0ef0bd2089/src/pageseg.c#L2370

Zdenko

st 6. 1. 2021 o 17:43 Deepak Sharma <dee...@intellectfaces.co.in> napísal(a):

I am trying to preprocess resumes for building an OCR model. Please refer to the reference image attached in this message. 

As you can see, under the skills section, all the skills are surrounded by bluish green patch. I need help with how to remove those colors from the image?

Ideally, after preprocessing, the image should be just white(background) with black text

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[Deepak Sharma]

can you suggest me with an alternate for leptonica for "python & windows"

[Zdenko Podobny]

Unfortunately I am not aware of (maintained) python leptonica support (any volunteers?), but you can directly use leptonica&tesseract via cffi in python.

See some examples :

https://sk-spell.sk.cx/building-minimalistic-tesseract

https://github.com/zdenop/SimpleTesseractPythonWrapper/blob/master/SimpleTesseractPythonWrapper.ipynb

Zdenko

št 7. 1. 2021 o 12:39 Deepak Sharma <dee...@intellectfaces.co.in> napísal(a):

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/8b901094-97bd-43a3-bfd0-ae598b6b1e19n%40googlegroups.com.

[Deepak Sharma]

are there any equivalent function in OpenCV which can do similar executions like what you did with leptonica?