TXI: Texture and Color Enhancement Imaging for Endoscopic Image Enhancement

Table 1

Quantitative evaluation of enhancement methods for image criteria improvement. Bold numbers represent the best or equally best performance in each metric.

Metrics	Scene	Reference (WLI w/A3)	IHb color enhancement [9]	WLI w/A8 [9]	HE	M1 [16]	Proposed TXI mode1	Proposed TXI mode2
Illumination uniformity (standard deviation)	Esophagus	37.165	39.134	37.323	60.222	58.102	33.353	33.643
	Stomach	19.016	20.979	19.086	33.759	26.553	19.108	19.293
	Colon	19.315	19.737	19.583	33.439	44.775	19.344	19.424
	Average	25.165	26.617	25.330	42.473	43.143	23.935	24.120
Color (ΔE)	Esophagus	8.004	9.120	9.586	15.221	19.228	16.026	13.474
	Stomach	4.471	5.055	5.102	7.619	7.441	12.364	8.542
	Colon	5.590	6.596	6.254	5.666	13.375	15.407	9.887
	Average	6.022	6.924	6.981	9.502	13.348	14.599	10.634
Contrast (EBCM)	Esophagus	5.264	5.244	9.117	8.898	6.319	10.176	10.132
	Stomach	5.167	5.175	8.839	7.780	6.630	9.865	9.830
	Colon	4.909	4.842	9.094	8.582	9.709	9.829	9.856
	Average	5.114	5.087	9.017	8.420	7.552	9.957	9.939
Naturalness (SSIM)	Esophagus	1.000	0.995	0.970	0.839	0.534	0.852	0.926
	Stomach	1.000	0.996	0.977	0.827	0.563	0.916	0.957
	Colon	1.000	0.997	0.982	0.836	0.029	0.930	0.973
	Average	1.000	0.996	0.977	0.834	0.375	0.899	0.952