Fig. 1. Simulated marine environment and sea-surface spilled oil with different thicknesses

Fig. 2. Snapshot hyperspectral system. (a) MOSAIC snapshot hyperspectral imager; (b) pixel-level coating detector

Fig. 3. Hyperspectral image and reflectivity spectrum of each sample. (a) Hyperspectral image from snapshot camera; (b) reflectivity spectra of oil film and seawater; (c) reflectivity spectra of crude oil film with different thicknesses of Daqing Oilfield; (d) reflectivity spectra of crude oil film with different thicknesses of Shengli Oilfield

Fig. 4. Wavelet reconstructed reflectivity spectra of oil film with different thicknesses. (a) Crude oil film of Daqing Oilfield; (b) crude oil film of Shengli Oilfield

Fig. 5. Detail coefficient of high-frequency reconstructed signal of crude oil film of Daqing Oilfield in discrete wavelet transform. (a) Detail coefficient of the third layer high-frequency reconstructed signal; (b)detail coefficient of the fourth layer high-frequency reconstructed signal; (c) detail coefficient of the fifth layer high-frequency reconstructed signal; (d) detail coefficient of the sixth layer high-frequency reconstructed signal; (e) detail coefficient of the seventh layer high-frequency reconstructed signal; (f) detail coefficient of the eighth layer high-frequency reconstructed signal; (g)detail coefficient of the ninth layer high-frequency reconstructed signal

Fig. 6. Detail coefficient of the ninth layer high-frequency reconstructed signal of crude oil film of Shengli Oilfield in discrete wavelet transform

Fig. 7. Variation of the sum of detail coefficients of each channel of different crude oil films. (a) Crude oil film of Daqing Oilfield; (b) crude oil film of Shengli Oilfield

Fig. 8. Thick oil film distribution