Wei Wei, Lihua Huang, Xinran Zhu, Liqing Ling, Kai Guo, Huijie Huang. Application of reflectance transformation imaging for the display of handwriting traces[J]. Chinese Optics Letters, 2019, 17(11): 111101
- Chinese Optics Letters
- Vol. 17, Issue 11, 111101 (2019)
Fig. 1. Image of the object surface with colored handwriting traces (in the rectangle on the lower right) and colorless handwriting indentations (in the rectangle on the upper left).
Fig. 2. Measured results of the depth of the trace: (a) the depth of local traces at I, (b) the depth of local traces at II.
Fig. 3. Image acquisition: (a) capture device, (b) the position of light sources; the blue circle represents the projection of the light source onto the horizontal plane.
Fig. 4. Colored handwriting traces applying RTI: (a) and (b) are in default mode, (c) and (d) are in specular enhancement mode.
Fig. 5. Colorless handwriting indentations applying RTI: (a) and (b) are in default mode, (c) and (d) are in specular enhancement mode.
Fig. 6. RTI of colored handwriting traces: (a) in default mode,
Fig. 7. RTI of colorless handwriting traces: (a) in default mode,
Fig. 8. RTI of colored handwriting traces: (a) in default mode,
Fig. 9. RTI of colorless handwriting traces: (a) in default mode,
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