Adaptive Stereo Matching Based on Local Information Entropy and Improved AD-Census Transform

Jingfa Lei; Zihan Wei; Yongling Li; Ruhai Zhao; Miao Zhang

doi:10.3788/LOP240968

Laser & Optoelectronics Progress, Volume. 62, Issue 2, 0215004(2025)

Adaptive Stereo Matching Based on Local Information Entropy and Improved AD-Census Transform

Jingfa Lei^1,2,3、*, Zihan Wei^1,2, Yongling Li^1,2,3, Ruhai Zhao^1,2, and Miao Zhang^1,2

Author Affiliations

¹School of Mechanical and Electrical Engineering, Anhui Jianzhu University, Hefei 230601, Anhui , China

²Key Laboratory of Intelligent Manufacturing of Construction Machinery, Anhui Education Department, Hefei 230601, Anhui , China

³Sichuan Provincial Key Laboratory of Process Equipment and Control Engineering, Zigong 643000, Sichuan , China

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Abstract Get PDF(in Chinese)

Figures & Tables(13)

Fig. 1. Flow chart of proposed algorithm

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Fig. 2. Census transformation process. (a) The pixel grayscale value of the original image window; (b) Census transform results

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Fig. 3. Original image and local entropy image. (a) Original image; (b) local entropy image

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Fig. 4. Grayscale histogram and information entropy value in three regions. (a) Grayscale histogram of part 1; (b) grayscale histogram of part 2; (c) grayscale histogram of part 3; (d) the entropy of the three regions

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Fig. 5. Curves of weight

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Fig. 6. Schematic diagram of path aggregation

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Fig. 7. Matching results. (a) Original images; (b) standard parallax maps; (c) Traditional Census; (d) AD+Census; (e) proposed algorithm

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Fig. 8. Average mismatch rates for different noises. (a) Average mismatch rates for salt-and-pepper noise; (b) average mismatch rates for Gaussian noise

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Table 1. Parameter setting
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Table 1. Parameter setting
Parameter $T_{1}$ $T_{2}$ $λ_{C e n}$ $λ_{A D}$ $θ$ $P_{1}$ $P_{2}^{'}$
Value 1.5 5.5 10 30 2.0 10 150

Table 2. Average mismatch rate under salt and pepper noise
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Table 2. Average mismatch rate under salt and pepper noise
Noise density CT SAD AD-Census GRD Proposed algorithm
0 7.09 7.42 7.20 8.09 6.12
0.03 7.94 10.28 8.32 10.41 6.61
0.06 9.05 12.45 9.27 12.44 7.61
0.09 10.49 14.62 10.23 13.12 8.67
0.12 12.21 17.73 11.96 16.18 10.28

Table 3. Average mismatch rate under Gaussian noise
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Table 3. Average mismatch rate under Gaussian noise
Standard deviation CT SAD AD-Census GRD Proposed algorithm
0 7.09 7.42 7.20 8.09 6.12
2 7.91 8.04 8.31 9.77 7.27
4 10.01 10.20 9.64 12.49 9.59
6 11.88 12.73 11.63 14.09 11.39
8 14.98 15.53 13.85 17.63 13.54

Table 4. Mismatch rates of no-occluded region

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Table 4. Mismatch rates of no-occluded region

Image	Mismatch rate /%
Image	SGM	AD-Census	Ada_SGM	MCT	Proposed algorithm
Average	8.17	6.67	7.20	7.49	5.94
Adirondack	7.19	6.91	5.68	6.85	5.33
Teddy	7.75	6.15	6.14	6.94	5.76
Pipes	13.40	10.00	11.48	12.88	9.25
Recycle	9.89	7.70	8.46	8.24	6.85
Wood2	4.02	3.51	4.89	3.96	2.68
Cloth2	6.74	5.72	6.54	6.07	5.75

Table 5. Mismatch rates of all regions

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Table 5. Mismatch rates of all regions

Image	Mismatch rate /%
Image	SGM	AD-Census	Ada_SGM	MCT	Proposed algorithm
Average	10.54	9.09	9.62	9.93	8.37
Adirondack	7.73	7.54	6.27	7.35	5.84
Teddy	12.55	10.85	10.82	11.90	10.60
Pipes	18.81	15.80	17.01	18.28	14.86
Recycle	11.07	8.83	9.92	9.70	8.16
Wood2	5.76	5.26	6.61	5.70	4.44
Cloth2	7.29	6.27	7.09	6.62	6.30

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Jingfa Lei, Zihan Wei, Yongling Li, Ruhai Zhao, Miao Zhang. Adaptive Stereo Matching Based on Local Information Entropy and Improved AD-Census Transform[J]. Laser & Optoelectronics Progress, 2025, 62(2): 0215004

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