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Fig. 3 | EURASIP Journal on Image and Video Processing

Fig. 3

From: Stopping criterion for linear anisotropic image diffusion: a fingerprint image enhancement case

Fig. 3

Linear isotropic diffusion process for noisy image. a shows a noisy black ball test image with white background. The zero mean Gaussian Noise added such that SNR reduces to 2 dB. b shows the spatial entropy-change graph resulting from diffusion process on the natural scale parameter for a noisy image. Two peaks can be observed, where the first peak is the result of adding Gaussian noise, and the second peak is representing the characteristic size of the black balls. The diffused image resulting from stopping the diffusion process at the location of the second peak in entropy change is shown in c. Binarized image as a result of the threshold, set to the mean value of the diffused image results in (d)

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