Fig. 1. Schematic of region growing method

Fig. 2. X-band radar image with target interference

Fig. 3. Process for improved region growing method

Fig. 4. Schematic of screening process for target interference areas. (a) Original image; (b) image after one iteration; (c) image after five iterations; (d) image after fifteen iterations

Fig. 5. Schematic of compensation process for target interference area. (a) Original image; (b) pre-compensated image; (c) four-point mean filled image; (d) smooth transition image

Fig. 6. Comparison before and after image restoration. (a) Pre-restoration image of H_s=1.7 m in the nearshore area of the Yellow Sea; (b) restoration image of H_s=1.7 m in the nearshore waters of the Yellow Sea; (c) pre-restoration image with H_s=1.3 m in the pelagic waters of the Yellow Sea; (d) restoration image of H_s=1.3 m in the pelagic waters of the Yellow Sea; (e) pre-restoration image of H_s=2.6 m in the nearshore waters of the East China Sea; (f) restoration image of H_s=2.6 m in the nearshore waters of the East China Sea

Fig. 7. Polar coordinate image and buoy position

Fig. 8. Schematic of GoogLeNet model structure

Fig. 9. Grayscale images of each significant wave height for model training. (a) H_s=0.7 m; (b) H_s=1.2 m; (c) H_s=2.1 m; (d) H_s=3.6 m

Fig. 10. Line chart of relative error in parameter inversion results