Dropout red color and binarize image (Android)

asked 2016-09-09 04:44:58 -0600

Atado
21 ●1 ●4

Hey, im new to OpenCV and i'd like to use it in my Android Application.

In the app i have to process some images of transactions like this: Example image

I want to filter/dropout the red form color and then binarize the image.

Later i need some OCR to recognize some numbers in the footer etc. so thought i use this to improve the quality of the image:

Imgproc.morphologyEx(mat, mat, Imgproc.MORPH_OPEN, Imgproc.getStructuringElement(Imgproc.MORPH_RECT, new Size(2, 2)));
    Imgproc.morphologyEx(mat, mat, Imgproc.MORPH_CLOSE, Imgproc.getStructuringElement(Imgproc.MORPH_RECT, new Size(2, 2)));

The opening should remove the noise in the image and the closing after should improve the written values on the image.

Im not sure tho whats the best way to accomplish the first part (filtering the red form color and binarizing the image). Hope you can give me some tips.

Best regards

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Thanks alot for your answer. I think i managed to implement the first 4 steps but im stucking at the last one. Im not really sure what u mean with "Now apply a mask and set that mask to white, then merge both images together." Hope you can help me. Best regards

Atado ( 2016-09-12 04:51:39 -0600 )edit

In the last stage that succeeded you ended up with a binary image, the mask. where 1 should be the pixels to keep and 0 to ignore. If so, then you can simply do and AND between the input image channels and the mask, to have a resulting color image.

StevenPuttemans ( 2016-09-12 04:56:17 -0600 )edit

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Dropout red color and binarize image (Android)

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Dropout red color and binarize image (Android)