Zhang Xinhong, Zhang Yifan, Zhang Fan. Skew Detection of Scanned Document Image Based on Shearlet Transform[J]. Laser & Optoelectronics Progress, 2018, 55(1): 11007
- Laser & Optoelectronics Progress
- Vol. 55, Issue 1, 11007 (2018)
Fig. 1. Frequency domain support
Fig. 2. Some basis functions of Shearlet in frequency domain
Fig. 3. Flow chart of document images skew correction based on Shearlet transform
Fig. 4. Frequency domain distribution of Shearlet
Fig. 5. Experimental images
Fig. 6. Energy of all coefficients at different scales. (a) 2nd scale; (b) 3rd scale; (c) 4th scale; (d) 5th scale
Fig. 7. Corrected images
Fig. 8. Comparison of the 5th scale component before and after adding noise. (a) Before adding noise; (b) after adding noise
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Table 1. Comparison of experimental results
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Table 2. Comparison of average errors in grouping experiments
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