Extraction of Blood Vessels in Retinal Images Using Four Different Techniques

<table>Preprocessing steps for vessel tree extraction, (a) original image, (b) image with modified background of the image in (a), (c) image after homomorphic filtering of image in (b), (d) image after OTSU thresholding on the image in (c).</table>

Journal of Medical Engineering

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Figure 14

Figure 14: Extraction of Blood Vessels in Retinal Images Using Four Different Techniques 