derive - Differentiation functions

• gstsmooth - Compute the Gradient Structure Tensor of a (possibly multichannel) image.
• gstsmooth_base.
• grdsmooth - Compute the directional derivatives of an image.
• grdsmooth_base.
• hessmooth - Compute the Hessian Tensor of a (possibly multichannel) image.
• hessmooth_base.
• gstdecomp - Perform the eigen decomposition or the reconstruction of a tensor field.
• eigendecomp2x2sym - Test function for gstdecomp.
• gstfeature - Derive features like norm, orientation, coherence, or inertia from tensor representation
• gstfeature_base.
• grd2gst - Compute the entries of the gradient structure tensor of an image from its directional derivatives.
• grd2gst_base.
• grd2hess - Compute the entries of the Hessian of an image from its directional derivatives.
• grd2hess_base.
• grdmask - Compute the directional derivatives of an image through classical gradient operators using local difference masks.
• grdmask_base.
• grdmaskmap_base.