Captcha Image
Guys, This is a 4 channel image. Need some help on cleaning this image so that I can drop all the noise and background info (i.e., overlay image) and get only the text part i.e., those 6 letters.
def img_process(file_path):
img = cv2.imread(file_path)
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
max_filter = maximumBoxFilter(2,gray) #custom function
median_filter = cv2.medianBlur(max_filter,5)
ada_mean_thresh = cv2.adaptiveThreshold(median_filter,255,cv2.ADAPTIVE_THRESH_MEAN_C,cv2.THRESH_BINARY,11,2)
thresh = cv2.threshold(ada_mean_thresh, 0, 255, cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU)[1]
# invert_img = cv2.bitwise_not(thresh)
return gray,thresh
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