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

Table 1

Comparisons of the sharpened images with respect to original images in terms of PSNR.

Image	Dimension	Edge sharpening images
		(a) HVD without LPF			(a) HVD with 𝜃LPF≥2			Δ
		𝑠=0.5	𝑠=0.8	𝑠=1.0	𝑠=0.5	𝑠=0.8	𝑠=1.0
House	512 × 512	68.63	59.06	54.59	69.12	59.55	55.08	39
F-16	512 × 512	79.55	69.90	65.42	80.43	70.78	66.30	38
Peppers	512 × 512	86.41	77.02	72.58	88.84	79.49	75.06	41
Woodland Hills, CA	512 × 512	62.27	52.75	48.32	62.90	53.38	48.95	41
Lena	512 × 512	85.90	76.41	72.00	86.73	77.26	72.84	36
Sailboat on lake	512 × 512	73.09	63.48	59.00	73.91	64.30	59.82	36
Baboon	512 × 512	66.30	56.72	52.21	66.66	57.07	52.56	39
Foster City, CA	512 × 512	79.15	69.46	64.96	80.74	71.08	66.59	32
Tiffany	512 × 512	77.31	68.98	65.16	78.32	70.01	66.19	58
Neck	504 × 700	88.76	78.60	73.93	91.03	80.88	76.21	20
Moon surface	256 × 256	76.04	66.40	61.87	78.46	68.83	64.30	31
Goldhill	720 × 576	76.39	66.67	62.14	77.37	67.65	63.12	23
Average		76.65	67.12	62.68	77.87	68.36	63.92	36

“𝑠” is scaling factor between 0 and 1.
Low-pass filtering (LPF) and edge sharpening is for edge pixel only.