java - what types of image processing i need to make image clear for OpenCV? -

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i'm working on android application capture image , detect page number using ocr, made processing using opencv on image , i'am stuck @ point 1![see image]

so next step new image contains numbers ocr??

since numbers in same position, easiest way select them select portion of image, this:

mat1b gray = imread("pat_to_image", imread_grayscale); rect roi(285, 630, 130, 100);   // manually selected values mat1b numbers = gray(roi).clone();

numbers this:

enter image description here


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