Laser & Optoelectronics Progress, Volume. 55, Issue 1, 11007(2018)
Skew Detection of Scanned Document Image Based on Shearlet Transform
Figures & Tables(10)
Fig. 3. Flow chart of document images skew correction based on Shearlet transform
Fig. 6. Energy of all coefficients at different scales. (a) 2nd scale; (b) 3rd scale; (c) 4th scale; (d) 5th scale
Fig. 8. Comparison of the 5th scale component before and after adding noise. (a) Before adding noise; (b) after adding noise
Table 1. Comparison of experimental results
View tableTable 1. Comparison of experimental results
Image Skew angle /(°) ICDAR2013 dataset Radon PCP e-PCP PPA Our method 1 8.63 9 8.40 8.41 8.49 8.55 2 22.01 22 22.36 22.35 22.23 21.81 3 14.76 15 14.22 14.22 14.45 14.69 4 5.59 5 5.29 5.31 5.43 5.54 5 28.82 29 28.38 28.41 28.56 28.47 6 9.35 9 9.01 9.04 9.11 9.48 7 11.47 11 11.17 11.18 11.36 11.31 8 18.75 19 18.32 18.31 18.42 18.46 9 23.49 23 23.58 23.69 23.30 23.33 10 13.57 14 13.43 13.41 13.51 13.84
Table 2. Comparison of average errors in grouping experiments
View tableTable 2. Comparison of average errors in grouping experiments
Group Image number Skew angle /(°) Radon PCP e-PCP PPA Our method English 50 0.323 0.256 0.256 0.193 0.167 Chinese 50 0.402 0.351 0.355 0.232 0.136 English with diagrams 50 0.384 0.323 0.325 0.207 0.181 Chinese with diagrams 50 0.563 0.366 0.369 0.261 0.158
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Zhang Xinhong, Zhang Yifan, Zhang Fan. Skew Detection of Scanned Document Image Based on Shearlet Transform[J]. Laser & Optoelectronics Progress, 2018, 55(1): 11007
Paper Information
Category: Image Processing
Received: Jun. 19, 2017
Accepted: --
Published Online: Sep. 10, 2018
The Author Email: Zhang Fan (zhangfan@henu.edu.cn)
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