Adaptive optimization control method for overexposure of industrial camera

Wenlin WU; Xiaobo LIAO; Junzhong LI; Jun ZHOU; Jian ZHUANG

doi:10.37188/OPE.20233102.0226

Optics and Precision Engineering, Volume. 31, Issue 2, 226(2023)

Adaptive optimization control method for overexposure of industrial camera

Wenlin WU1... Xiaobo LIAO1,2,*, Junzhong LI1, Jun ZHOU1 and Jian ZHUANG2 |Show fewer author(s)

¹School of Manufacturing Science and Engineering， Key Laboratory of Testing Technology for Manufacturing Process， Minsitry of Education， Southwest University of Science and Technology， Mianyang6200， China

²School of Mechanical Engineering， Xi’ an Jiaotong University， Xi’ an710049，China

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Figures & Tables(10)

Fig. 1. Area division

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Fig. 2. Regionalized threshold evaluation system

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Fig. 3. Experimental platform for algorithms

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Fig. 4. Exposure control response curve

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Fig. 5. Comparison with automatic exposure adjustment

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Fig. 6. Comparison with histogram exposure adjustment

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Table 1. Exposure control parameters experimental data
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Table 1. Exposure control parameters experimental data
实验编号初始曝光设定值调节时间/s
1 8 000 200 0.08
2 8 000 200 0.06
3 8 000 200 0.10
4 8 000 200 0.09
5 8 000 200 0.07

Table 2. Comparison with the camera hardware automatic exposure method

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Table 2. Comparison with the camera hardware automatic exposure method

设置亮度 /Lx	曝光调节方式	Laplacian图像平均标准差值/pix
2 070	相机自动曝光调节	15.839 8
2 070	本文算法曝光调节	34.583 5
2 280	相机自动曝光调节	15.528 3
2 280	本文算法曝光调节	33.532 4
2 456	相机自动曝光调节	15.180 5
2 456	本文算法曝光调节	34.669 9
2 803	相机自动曝光调节	14.712 9
2 803	本文算法曝光调节	34.613 9
3 145	相机自动曝光调节	13.906 4
3 145	本文算法曝光调节	34.608 2

Table 3. Histogram exposure adjustment strategy
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Table 3. Histogram exposure adjustment strategy
图像直方图最大值设置曝光值
>150 2 500
>70 1 500
>30 1 000
>15 500

Table 4. Comparison with histogram exposure adjustment method

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Table 4. Comparison with histogram exposure adjustment method

设置亮度 /Lx	曝光调节方式	Laplacian图像平均标准差值/pix
2 654	直方图曝光调节	27.798 1
2 654	本文算法曝光调节	34.731 7
3 006	直方图曝光调节	27.854 1
3 006	本文算法曝光调节	34.769 7
3 068	直方图曝光调节	28.940 5
3 068	本文算法曝光调节	34.675 2
3 160	直方图曝光调节	27.687 6
3 160	本文算法曝光调节	34.578 7
3 391	直方图曝光调节	28.437 2
3 391	本文算法曝光调节	34.753 4

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Wenlin WU, Xiaobo LIAO, Junzhong LI, Jun ZHOU, Jian ZHUANG. Adaptive optimization control method for overexposure of industrial camera[J]. Optics and Precision Engineering, 2023, 31(2): 226

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