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MNEPatchInfo

Namespace: MNELIB  ·  Library: MNE Library

#include <mne/mne_patch_info.h>

class MNELIB::MNEPatchInfo

Implements an MNE Patch Information (Replaces *mnePatchInfo,mnePatchInfoRec; struct of MNE-C mne_types.h).

Patch information for a single source space point including vertex members and area.

Public Methods​

MNEPatchInfo()​

Constructs the MNE Patch Information Refactored: mne_new_patch (mne_source_space.c).

~MNEPatchInfo()​

Destroys the MNE Patch Information Refactored: mne_free_patch (mne_source_space.c).

calculate_area(s)​

Calculates the total surface area of this patch.

Iterates over all member vertices of the patch. For each vertex, sums one-third of the area of every neighboring triangle. The factor of 1/3 accounts for each triangle being shared among its three vertices. The result is stored in the member variable area.

Refactored from: calculate_patch_area (mne_patches.c).

Parameters:

  • s : *MNESourceSpace ** Pointer to the source space containing the triangle mesh (neighbor triangles and triangle areas).

calculate_normal_stats(s)​

Calculates the average surface normal and its deviation for this patch.

Computes the mean normal direction (ave_nn) by summing the normals of all member vertices and normalizing the result to unit length. Then computes the average angular deviation (dev_nn) of each member vertex normal from the mean normal, in radians, using the arccosine of the dot product.

Parameters:

  • s : *MNESourceSpace ** Pointer to the source space containing vertex normals (nn) for each vertex in the mesh.

Example​

No example of its own: Patch statistics computed while reading a source space with patches; reached through MNEHemisphere::pinfo.

It is exercised by:

src/examples/ex_mne_api/main.cpp
QFile srcFile(data + "/subjects/sample/bem/sample-oct-6-src.fif");
FiffStream::SPtr stream(new FiffStream(&srcFile));
MNESourceSpaces src;
stream->open();
MNESourceSpaces::readFromStream(stream, true, src); // add_geom: normals, triangle data and patches
stream->close();
const auto& lh = dynamic_cast<const MNEHemisphere&>(src[0]);
QList<VectorXi> vertno = src.get_vertno(); // used vertices per hemisphere

From ex_mne_api.

Authors of this file​