Fig. 1. Internal structure of the laser

Fig. 2. Composition of the streak camera^[7]

Fig. 3. Filtering results of different methods. (a) Mean filtering; (b) mean filtering+KNN filtering; (c) mean filtering+neighborhood average filtering

Fig. 4. Intensity images of different targets. (a) Original image; (b) intensity image

Fig. 5. Imaging results of combined targets. (a) Target; (b) imaging result

Fig. 6. RMSE of different distances

Fig. 7. Laser stripe width at different distances

Fig. 8. Smoke environment

Fig. 9. Imaging results in smoke

Fig. 10. RMSE of different imaging distances in smoke