105945.fig.004a
(a) The image “House”
105945.fig.004b
(b) V-channel of “House” 
105945.fig.004c
(c) Edges detected by HVD
105945.fig.004d
(d) Edges detected by Canny
105945.fig.004e
(e) Edges by HVD with LPF
105945.fig.004f
(f) Edges by Canny with LPF
105945.fig.004g
(g) Sharpened V by HVD
105945.fig.004h
(h) Sharpened V by Canny
105945.fig.004i
(i) Result by HVD ( )
105945.fig.004j
(j) Result by HVD ( )
Figure 4: for HVD. (a) The image “House” (512 × 512 color image). (b) V-channel of “House". (c) Edges detected by HVD. (d) Edges detected by Canny. (e) Edges detected by HVD with LPF. (f) Edges detected by Canny with LPF. (g) Sharpened Value channel by HVD with LPF. (h) Sharpened Value channel by Canny with LPF. (i) Sharpened result by HVD with scaling factor . (j) Sharpened result by Canny with scaling factor .