Method for skeletonizing the strands (T X, T Y) of a composite material part in a 3D image of said part, said image comprising a plurality of voxels (vox, vox1, vox2, vox3) extending in an orthogonal coordinates system (i, j, k) and each comprising a gray level, said method comprising: • a phase of detecting (E D) a plurality of oriented section centers (Cx, C Y) of the strands (T X, T Y) of the part in the image, and • a phase of linking (E L) each center (Cx, C Y) to the closest center (Cx, C Y) of same orientation, in order to link the centers (Cx, C Y) associated with a same strand (Tx, T Y), so as to obtain the skeleton (Sqx, Sq Y) of the strands (Tx, T Y) of said part, • in said method, the detection phase (E D) is implemented by means of at least one reference volume (Rx, R X', R X", R Y) comprising a plurality of voxels (vox), said voxels (vox) extending in the orthogonal coordinates system (i, j, k) and each comprising a gray level in such a way that the reference volume (Rx, R X', R X", R Y) comprises a centered strand pattern (Mx, M X', M X", M Y) extending along a given direction (X, Y), said detection phase (E D) comprising, for each reference volume (Rx, R X', R X", R Y): • a step of determining portions (Px, P Y, P X1, P X2, P X3) of the image comprising a central voxel (vox1, vox2, vox3) and of dimension equal to that of the reference volume (R X, R X', R X", R Y); • a step of calculating a correlation score (S X, S Y, S X1, S X2, S X3, S X3', S X3") between the reference volume (Rx, R X', R X", R Y) and each portion (Px, P Y, P X1, P X2, P X3) of the image by comparison of the gray level of their respective voxels (vox), said correlation score (Sx, S Y, S X1, S X2, S X3, S X3', S X3") being associated with the central voxel (vox1, vox2, vox3) of each portion (Px, P Y, P X1, P X2, P X3) so as to obtain a correlation score (Sx, S Y, S X1, S X2, S X3, S X3', S X3") for each voxel (vox) of the image forming a matrix of correlation scores, and • a step of determining oriented section centers (Cx, C Y) of the strands (Tx, T Y) of the part, said centers (Cx, C Y) corresponding to the voxels (vox) of the image of which the correlation score (Sx, S Y, S X1, S X2, S X3, S X3', S X3") corresponds to a local maximum of the matrix of correlation scores, the orientation of said centers (Cx, C Y) being defined by the direction (X, Y) of the strand pattern (M X, M Y) of the reference volume (R X, R X', R X", R Y). • a phase of detecting (E D) a plurality of oriented section centers (Cx, C Y) of the strands (T X, T Y) of the part in the image, and • a phase of linking (E L) each center (Cx, C Y) to the closest center (Cx, C Y) of same orientation, in order to link the centers (Cx, C Y) associated with a same strand (Tx, T Y), so as to obtain the skeleton (Sqx, Sq Y) of the strands (Tx, T Y) of said part, • in said method, the detection phase (E D) is implemented by means of at least one reference volume (Rx, R X', R X", R Y) comprising a plurality of voxels (vox), said voxels (vox) extending in the orthogonal coordinates system (i, j, k) and each comprising a gray level in such a way that the reference volume (Rx, R X', R X", R Y) comprises a centered strand pattern (Mx, M X', M X", M Y) extending along a given direction (X, Y), said detection phase (E D) comprising, for each reference volume (Rx, R X', R X", R Y): • a step of determining portions (Px, P Y, P X1, P X2, P X3) of the image comprising a central voxel (vox1, vox2, vox3) and of dimension equal to that of the reference volume (R X, R X', R X", R Y); • a step of calculating a correlation score (S X, S Y, S X1, S X2, S X3, S X3', S X3") between the reference volume (Rx, R X', R X", R Y) and each portion (Px, P Y, P X1, P X2, P X3) of the image by comparison of the gray level of their respective voxels (vox), said correlation score (Sx, S Y, S X1, S X2, S X3, S X3', S X3") being associated with the central voxel (vox1, vox2, vox3) of each portion (Px, P Y, P X1, P X2, P X3) so as to obtain a correlation score (Sx, S Y, S X1, S X2, S X3, S X3', S X3") for each voxel (vox) of the image forming a matrix of correlation scores, and • a step of determining oriented section centers (Cx, C Y) of the strands (Tx, T Y) of the part, said centers (Cx, C Y) corresponding to the voxels (vox) of the image of which the correlation score (Sx, S Y, S X1, S X2, S X3, S X3', S X3") corresponds to a local maximum of the matrix of correlation scores, the orientation of said centers (Cx, C Y) being defined by the direction (X, Y) of the strand pattern (M X, M Y) of the reference volume (R X, R X', R X", R Y).