Yifan Huang, Yan He, Shanjiang Hu, Chunhe Hou, Xiaolei Zhu, Kaipeng Li, Fanghua Liu, Yongqiang Chen, Shouchuan Guo. Extracting sea water depth by image processing of ocean lidar[J]. Infrared and Laser Engineering, 2021, 50(6): 20211034
- Infrared and Laser Engineering
- Vol. 50, Issue 6, 20211034 (2021)
Fig. 1. Airborne dual-frequency lidar Mapper 5000 system
Fig. 2. Schematic diagram of receiving light path for sub-field of view
Fig. 3. Comparisons of uncorrected base waveform and corrected base waveform. (a) Uncorrected base value waveform comparison; (b) Corrected base value waveform comparison
Fig. 4. Seawater echo energy profile
Fig. 5. Seawater echo energy profile in the range of 401-600 ns
Fig. 6. Seawater echo energy profile after bilateral filtering
Fig. 7. (a) Seawater echo energy profile after partial thresholding of Niblack; (b) Segmented area corresponds to the seawater echo energy
Fig. 8. Seafloor echo profile
Fig. 9. (a) Comparison result of image processing method and waveform processing method; (b) Difference between the image processing slope distance and the waveform processing slope distance
Fig. 10. Seafloor echo profile under different motor code numbers
Fig. 11. The comparison result of image processing and waveform processing corresponds to the area in Figure 10
Fig. 12. Image processing and waveform processing slope distance difference corresponds to Figure 10
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Table 1. The number of seabed echoes and the maximum detection slope distance of different algorithms
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