I have some License Plate images which have poor quality, I tried some contrast enhancement methods like HE,BHE,CLAHE,RSIHE and ... , but when I binarize them with otsu's method or some local thresholding algorithms like NIBLACK,SAUVOLA and ... , I don't get satisfied results.
please tell me how can enhance this images??
results of binaraization:
what is the problem of this images?(low contrast??) how can I improve results? thanks for your help, any idea will be welcome.