A Block-Based Regularized Approach for Image Interpolation

Table 1

PSNR performance comparison of various image interpolation approaches.

Image	Noise level	Lagrange-based	Bicubic	Edge-directed	Proposed method
Lena; (512×512)	30 dB	32.93	33.19	31.73	33.72
	40 dB	33.13	33.39	31.82	34.39
	Noiseless	33.15	33.41	31.83	34.47
Boat; (512×512)	30 dB	30.21	30.46	29.24	31.02
	40 dB	30.33	30.58	29.30	31.43
	Noiseless	30.35	30.59	29.31	31.48
Board; (256×256)	30 dB	14.15	14.30	13.77	14.98
	40 dB	14.17	14.31	13.79	14.99
	Noiseless	14.18	14.31	13.79	14.99
CalTrain; (400×512)	30 dB	29.25	29.40	28.59	29.90
	40 dB	29.35	29.48	28.63	30.19
	Noiseless	29.36	29.49	28.64	30.23