Image Enhancement Method Based on Clear Region Screening

Laser & Optoelectronics Progress, Volume. 61, Issue 22, 2237009(2024)

Qianqian Zhang and Weihong Ma^*

Author Affiliations

School of Opto-Electronical Engineering, Xi'an Technological University, Xi'an 710021, Shaanxi , China

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Figures & Tables(10)

Fig. 1. Schematic diagram of image acquisition system

Fig. 2. Principle of proposed method

Fig. 3. Measurement system for non-planar element

Fig. 4. Partial images with different clear areas in image groups. (a)‒(c) Test case 1; (d)‒(f) test case 2; (g)‒(i) test case 3

Fig. 5. Processed results of test case 1 by several methods. (a) HE; (b) AF; (c) Roberts sharpen; (d) Retinex algorithm; (e) proposed method

Fig. 6. Processed results of test case 2 by several methods. (a) HE; (b) AF; (c) Roberts sharpen; (d) Retinex algorithm; (e) proposed method

Fig. 7. Processed results of test case 3 by several methods. (a) HE; (b) AF; (c) Roberts sharpen; (d) Retinex algorithm; (e) proposed method

Method	Entropy	PSNR /dB	STD	SSIM	Sharpness
HE	5.2904	13.4458	0.2932	0.5235	49582.54
AF	6.0727	36.4125	0.1037	0.9427	52270.56
Roberts sharpen	0.2960	6.5780	0.2226	-0.0110	15246.42
Retinex algorithm	7.3776	12.5530	0.2170	0.6037	41049.58
Proposed method	6.2241	30.6736	0.1140	0.9018	53014.15

Method	Entropy	PSNR /dB	STD	SSIM	Sharpness
HE	5.9778	15.6046	0.2934	0.7336	67823.26
AF	7.2489	40.7267	0.1719	0.8262	67644.54
Roberts sharpen	0.1578	7.1808	0.1498	0.0039	14895.67
Retinex algorithm	7.7254	16.8551	0.2386	0.6656	63764.89
Proposed method	7.3533	28.8421	0.1797	1.0000	75692.46

Method	Entropy	PSNR /dB	STD	SSIM	Sharpness
HE	5.8573	21.1954	0.2925	0.6808	75507.21
AF	7.5157	39.4469	0.2772	0.7677	83009.73
Roberts sharpen	0.1507	5.8253	0.1456	0.0056	14887.09
Retinex algorithm	7.7681	19.1515	0.2761	0.6535	82406.35
Proposed method	7.5617	26.3816	0.2764	1.0000	83047.50