An Efficient and Self-Adapted Approach to the Sharpening of Color Images

Figure 9

𝜃_eth=16 for HVD. (a) The image “Lena” (512 × 512 color image). (b) Edges detected by HVD with LPF. (c and d) Sharpened results by HVD with scaling factors 0.5 and 1.0, respectively.

(a) Original image

(b) Edges detected by HVD with LPF

(c) Scaling factor 𝑠=0.5 

(d) Scaling factor 𝑠=1.0