OTB.StereoRectificationGridGenerator: Generates two deformation fields to resample in epipolar geometry, a pair of stereo images up to the sensor model precision

The left image from the stereo pair, in sensor geometry.

The right image from the stereo pair, in sensor geometry.

The deformation grid to resample the left image from sensor geometry to epipolar geometry.

The deformation grid to resample the right image from sensor geometry to epipolar geometry.

This parameter allows selecting a directory containing Digital Elevation Model files. Note that this directory should contain only DEM files. Unexpected behaviour might occurs if other images are found in this directory.

Use a geoid grid to get the height above the ellipsoid in case there is no DEM available, no coverage for some points or pixels with no_data in the DEM tiles. A version of the geoid can be found on the OTB website(https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb-data/blob/master/Input/DEM/egm96.grd).

This parameter allows setting the default height above ellipsoid when there is no DEM available, no coverage for some points or pixels with no_data in the DEM tiles, and no geoid file has been set. This is also used by some application as an average elevation value.

Step of sub-sampling for average elevation estimation

The scale parameter allows generating zoomed-in (scale < 1) or zoomed-out (scale > 1) epipolar images.

Stereo-rectification deformation grid only varies slowly. Therefore, it is recommended to use a coarser grid (higher step value) in case of large images

The deformation grid to resample the left image from the epipolar geometry back into its original sensor geometry.

The output deformation grid to resample the right image from the epipolar geometry back into its original sensor geometry.

Grid inversion is an heavy process that implies spline regression on control points. To avoid eating to much memory, this parameter allows one to first sub-sample the field to invert.

The deformation grid to resample the left image from sensor geometry to epipolar geometry.

The deformation grid to resample the right image from sensor geometry to epipolar geometry.

Average elevation value estimated from DEM

Disparity corresponding to estimated minimum elevation over the left image

Disparity corresponding to estimated maximum elevation over the left image

The application computes the optimal rectified image size so that the whole left input image fits into the rectified area. However, due to the scale and step parameter, this size may not match the size of the deformation field output. In this case, one can use these output values.

The application computes the optimal rectified image size so that the whole left input image fits into the rectified area. However, due to the scale and step parameter, this size may not match the size of the deformation field output. In this case, one can use these output values.

This parameter is the mean value, in pixels.meters^-1, of the baseline to sensor altitude ratio. It can be used to convert disparities to physical elevation, since a disparity of one pixel will correspond to an elevation offset of the invert of this value with respect to the mean elevation.

The deformation grid to resample the left image from the epipolar geometry back into its original sensor geometry.

The output deformation grid to resample the right image from the epipolar geometry back into its original sensor geometry.