The ship detection technology has important civil and military value. Aiming at the problem of low accuracy of ship detection in complex sea scenes, a candidate region detection algorithm of maritime ship based on FT and Scharr is proposed. The FT saliency model can effectively suppress the background noise and highlight the central region of the target, but the detection effect of small target is poor. Scharr edge detection operator can highlight the edges of all salient targets, but it is easy to introduce background noise. The saliency maps obtained by FT and Scharr is fused by gaussian mixture function, so as to highlight the salient target and suppress the background noise. Finally, the region of interest is obtained by region extraction method. The detection results show that the fusion model can effectively suppress the background noise of the sea surface, and highlight the ship targets of all sizes, and has good effect in different complex sea scenes.
Aiming at the problem of irregular wrinkled surface on space objects, which cannot be described accurately by 3D model, then it is proposed to use the Lambert model instead of BRDF model to describe the scattering characteristics of the coating materials. In order to verify the correctness of this assumption, the photometric data of a satellite scale model was obtained from simulation calculation and experimental measurements using two sets of the same STK (Satellite Tool Kit) scenarios. Based on the material proprieties and orbit characteristics of space object, the numerical photometric model was built. Photometric measurement of the scale model was conducted in the dark laboratory. The RMSEs(Root Mean Square Errors) of the simulated and measured magnitude are 0.187 and 0.641 based on Lambert model in two different scenarios, while the RMSEs are 0.875 and 1.060 based on BRDF model. The results indicate that the simulation results base on Lambert model fit better with the experimental results than BRDF model.
The ship detection technology based on visual saliency methods is a research hotspot in the field of remote sensing. Aiming at the application of visual saliency methods under complex sea conditions, this paper firstly introduces the target characteristics of visible bands of the optical remote sensing image, and then analyzes the advantages and disadvantages of typical visual saliency methods applied to maritime ship detection through experiments. Finally, the problems of existing visual saliency methods applied to ship detection are summarized.
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