Shadow removal and information recovery for remote sensing images of lunar surface

Since the undulate topography of the lunar surface leads to the variance of the lunar surface remote sensing image pixels with the sun relative location and geometry orientation, the shadow pixels of the lunar surface remote sensing digital images are produced. In order to solve the problem, the judgment of the shadow on remote sensing images was implemented by utilizing DEM matching with the remote sensing images and the parameters of illumination orientation. A method for shadow removal of lunar remote sensing images taken under the condition of the natural topography was developed using adjacent reflective radiation based on DEM data. The shadow pixels remote sensing value can be rectified to the horizontal remote sensing value with same solar direct radiation. The simulation experiment result shows that the method can eliminate the shadow of lunar surface images and can thoroughly recover the reflection/spectrum characteristics of lunar surface images.