SFS (Shape From Shading) three-dimensional reconstruction sparse-DEM (Digital Elevation Model) encrypting method considering surface spectral information
A technology of three-dimensional reconstruction and spectral information, applied in the field of SFS three-dimensional reconstruction encryption sparse DEM, can solve the problems of low accuracy, not considering three-dimensional reconstruction errors, etc., to improve the estimation accuracy, avoid over-smoothing phenomenon, and improve the effect of DEM encryption accuracy
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[0128] Such as figure 1 As shown, a SFS three-dimensional reconstruction encryption sparse DEM method that takes into account surface spectral information includes the following steps:
[0129] Step 1, give the relationship between the gradient of the elevation value of the point set on the three-dimensional surface in the x-direction and y-direction and the spectral brightness value at the coordinate point (x, y) in the case of complex land cover, and construct the reflection under different assumptions Map model, and then establish reflection map equations for different ground object coverage types, the data include: coarse resolution DEM grid, high resolution remote sensing images in the same area; reflection map equation is based on the formula:
[0130] I (x,y) =R(p,q)
[0131] and assume:
[0132] 1) The terrain surface is a Lambertian body model;
[0133] 2) The sun light source can be regarded as a parallel projection of a point light source at infinity;
[0134] ...
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