Method for eliminating shadow on remote sensing digital image and recovering picture element remote sensing value in shadow

Abstract

The invention relates to a method of shadow elimination in the sonar remote sensing digital picture and the pixel remote sensing value restore in the shadow. First, judges and eliminates the submarine mountain body and the water body background shadow in the sonar remote sensing digital picture. Once more, finally completes the principle method of shadow elimination in the sonar remote sensing digital picture and the pixel remote sensing value restore in the shadow. Its concrete step is: input sonar remote sensing digital picture and the corresponding digital pographic diagram, seeks the shadow and computes parameter, separately seeks in the sonar remote sensing digital picture located under in the sonar and shadow similar pixel P1, P2 and separately calculates its normalized water body sound wave underwater pography illumination coefficient:G1 and G2 and sonar perpendicular incidence sound wave underwater pography illumination coefficient F1; Subsequently calculates the scattering / perpendicular incidence ratio of sonar sound wave at this shadow submarine horizontal ground, then calculates the scattering / perpendicular incidence ratio of sonar sound wave at all shadow submarine horizontal ground, in interpolation computes sonar sound wave scattering / perpendicular incidence ratio of no shaded area each submarine horizontal ground, finally output the picture after shadow elimination in the sonar remote sensing digital picture and the pixel remote sensing restore value in the shadow in the corresponding submarine horizontal ground the sonar sound wave scattering / perpendicular incidence ratio in the sonar remote sensing digital picture,greatly enhanced the scattering / perpendicular incidence ratio efficiency and precision.

Description

technical field [0001] The invention relates to a sonar remote sensing and geographic information system technology, in particular to a method for eliminating shadows on sonar remote sensing digital images and restoring pixel remote sensing values ​​in the shadows. Background technique [0002] Scatter / direct radiation ratio is an important parameter to characterize the state of water bodies, and it has special significance in water body environment, meteorology, environmental remote sensing and sonar remote sensing image processing. Due to the occlusion and shielding of the water body by the underwater topography, the illuminance distribution of the water scattered sound wave on the underwater surface will change due to the influence of the underwater topography. Due to the influence of the underwater topography, not only the total illuminance of the sound waves on the underwater ground is changed, but also the ratio of the illuminance of the scattered sound waves of the wa...

AI Technical Summary

Problems solved by technology

The conventional method of obtaining the scattering / direct radiation ratio is manual point-by-point measurement, which is time-consuming, laborious, and inefficient

Judging and eliminating the background shadows of underwater mountains and water bodies in sonar remote sensing digital images and the recovery of pixel remote sensing values ​​in the shadows have always been a difficult problem in remote sensing image processing. Conventional and traditional processing methods have not yet solved this problem

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