Global Distribution Adjustment and Nonlinear Feature Transformation for Automatic Colorization

Table 2

The comparisons of PSNR and matching time when using different methods for matching process in colorization.

Input	Feature learning		Feature Line		Superpixel
	PSNR	Matching time (ms)	PSNR	Matching time (ms)	PSNR	Matching time (ms)
	26.0869	160	25.5904	142	23.2869	134069
	25.5709	109	24.8474	114	24.4649	109128
	28.2651	130	24.9636	115	25.966	131581
	29.0486	140	28.9886	122	27.2218	178977
	26.0473	234	16.8502	201	20.6465	291383
	24.5262	179	21.167	133	22.3369	108276
	22.7022	172	19.3676	133	20.7267	70715
	23.4184	281	22.0257	123	22.391	40560
	23.1787	235	22.6112	177	21.5942	122036
	26.5051	191	24.89	81	24.8915	40617
	28.1289	110	26.9708	98	25.5595	52302
	26.3759	130	24.6655	108	25.6511	139367