A Study of Digital Image Enlargement and Enhancement

Table 1

MSE, SNR, and PSNR values.

Image type	Enlarging before enhancing			Enhancing before enlarging
	MSE	SNR	PSNR	MSE	SNR	PSNR
Back-lighted image	0.0276	15.9371	36.1769	0.0303	14.5373	32.9995
Overly dark image	0.0703	0.1906	14.2231	0.0694	0.1931	14.4061
Overly bright image	0.0289	29.3762	34.6451	0.0293	28.9550	34.1483
Normal image (1)	0.0183	13.9743	54.5193	0.0168	15.2157	59.3623
Normal image (2)	0.0137	36.2847	72.7440	0.0126	39.6825	79.5560