I have a data set of images and I want make a threshold of them, for this I’ve been using an adaptive threshold, and morphological operations but there are some images like this example with many blur, some idea for to make the digits as clear as possible. I proved the threshold with OTSU, local threshold and adaptive threshold and the results are not good. My code is
Mat plateFinal = imread(".../plate.bmp", 0);
Mat medianPlate;
medianBlur(plateFinal, medianPlate, 3);
Mat clean_img, clean_open, clean_close;
adaptiveThreshold(medianPlate, clean_img, 255,
CV_ADAPTIVE_THRESH_GAUSSIAN_C, THRESH_BINARY_INV, 27, 7);
Mat element = getStructuringElement(0, Size(3, 3), Point(1, 1));
// Apply the morphology operation
morphologyEx(clean_img, clean_open, MORPH_OPEN, element);
morphologyEx(clean_open, clean_close, MORPH_CLOSE, element);
imshow("image clean", clean_close);
and the result is:
