Shadow Removal Method Based on Improved Laplace-Gaussian Operator

Fig. 2. Improved log operator to extract edge contour. (a) Original image; (b) D_m; (c) C_m; (d) E_m; (e) S_n; (f) E_n; (g) E_t; (h) image after morphological operation

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Fig. 3. Flow chart of proposed algorithm

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Fig. 4. Process of proposed algorithm. (a) Original video frame; (b) ViBe algorithm detection; (c) log operator; (d) improved log operator; (e) proposed algorithm

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Fig. 5. Comparison of shadow removal results of Campus_raw video frames. (a) Original video frame; (b) foreground detection; (c) Hist shadow removal method; (d) HSV shadow removal method; (e) proposed algorithm

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Fig. 6. Comparison of shadow removal results of Highway I video frames. (a) Original video frame; (b) foreground detection; (c) Hist shadow removal method; (d) HSV shadow removal method; (e) log shadow removal method; (f) proposed algorithm

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Fig. 7. Histograms of four algorithms in two groups of videos. (a) BER; (b) ACC

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Table 1. Comparison of results of different shadow elimination algorithmsunit: %
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Table 1. Comparison of results of different shadow elimination algorithmsunit: %
Video Index Hist HSV log Proposed
Campus_raw η 60.5 61.2 58.3 87.8
ξ 50.2 62.0 62.3 89.7
Highway I η 67.0 70.3 63.7 77.6
ξ 75.2 77.1 73.4 81.7

Table 2. Comparison of processing speed of video between two groupsunit: frame·s^-1
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Table 2. Comparison of processing speed of video between two groupsunit: frame·s^-1
Video Hist HSV log Proposed
Campus_raw 4.14 1.83 3.96 2.60
Highway I 11.34 6.92 9.05 6.98

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Yongjie Ma, Mengli Chen. Shadow Removal Method Based on Improved Laplace-Gaussian Operator[J]. Laser & Optoelectronics Progress, 2020, 57(12): 121004

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Paper Information

Category: Image Processing

Received: Sep. 17, 2019

Accepted: Oct. 28, 2019

Published Online: Jun. 3, 2020

The Author Email: Yongjie Ma (myjmyj@163.com)

DOI:10.3788/LOP57.121004

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Comparison of results of different shadow elimination algorithmsunit: %

Table 1. Comparison of results of different shadow elimination algorithmsunit: %

Table 2. Comparison of processing speed of video between two groupsunit: frame·s-1

Table 2. Comparison of processing speed of video between two groupsunit: frame·s-1

Table 2. Comparison of processing speed of video between two groupsunit: frame·s^-1

Table 2. Comparison of processing speed of video between two groupsunit: frame·s^-1