Fig. 5

Results achieved through binarization with the utilization of various preprocessing approaches. A Original image, B Brightness and contrast, C Gray, D Blur, E Gaussian blur, F Median blur, G Bilateral, H Adaptive Gaussian, I Binary, J OSTU, K Binary triangle, L Adaptive mean, M Adaptive gaussian bin inv, N Adaptive mean bin inv, O Niblack, P Sauvoula, Q Adaptive Gaussian morpological line, R Erosion, S dilation, T Adaptive Gaussian k-means, U Adaptive Gaussian k-means fast denoising, V Binarization, W Normalize, X Canny edge, Y Canny edge Thinning, Z Sobel x, AA Sobel y, BB Lapclacian, CC Equalizer histogram, DD Equalizer histogram threshold