Multichannel Retinal Blood Vessel Segmentation Based on the Combination of Matched Filter and U-Net Network

Figure 4

(a, e, i) The fundus images, (b, f, j) green channel images applying CLAHE and gamma transformation, (c, g, k) background extracted by close operation, and (d, h, l) the final results. The different samples of (a–d) DRIVE, (e–h) STARE, and (i–l) CHASE_DB1.

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