Method, server, and computer program for performing registration between multiple images of different dimensions

A method of performing registration between a plurality of images of different dimensions by one or more processors of a computing device, the method comprising:

• primarily positioning a three-dimensional (3D) image in a 3D space having x-axis, y-axis, and z-axis, by identifying a first landmark in the 3D image;
• generating a registration image by registration between the primarily positioned 3D image and a two-dimensional (2D) image;
• and
• secondarily positioning the registration image,
• wherein the first landmark comprises a first landmark (A), a first landmark (B), a first landmark (C), and a first landmark (D),
• wherein the first landmark (A) and the first landmark (B) are related to left and right sides of a face,
• wherein the first landmark (C) and the first landmark (D) are related to front and rear sides of the face,
• wherein the primarily positioning of the 3D image comprises:
• performing y-axis rotation about the first landmark (C) to match a z-coordinate of the first landmark (A) with a z-coordinate of the first landmark (B);
• and
• performing z-axis rotation about the first landmark (C) to match a y-coordinate of the first landmark (A) with a y-coordinate of the first landmark (B),
• wherein the generating of the registration image comprises:
• matching directions of a head and the face in the 3D image with those of the head and the face in the 2D image;
• converting a size of the 2D image on the basis of the first landmark in the 3D image and a second landmark in the 2D image;
• and
• overlapping the 3D image and the 2D image by moving the size-converted 2D image on the basis of coordinates of the first landmark in the 3D image,
• wherein the second landmark comprises a second landmark (A) and a second landmark (B) related to the front and rear sides of the face, and
• wherein the overlapping of the 3D image and the 2D image comprises:
• moving the size-converted 2D image to match coordinates of the second landmark (A) with the coordinates of the first landmark (C);
• and
• overlapping the 2D image with the 3D image so that a second straight line connecting the second landmark (A) and the second landmark (B) in the 2D image is connected and aligned with a first straight line connecting the first landmark (C) and the first landmark (D) in the 3D image,
• wherein the secondarily positioning of the registration image comprises secondarily positioning the registration image on the basis of a third landmark in the registration image,
• wherein the third landmark comprises a third landmark (A) related to an orbitale, a third landmark (B) related to a porion, and a third landmark (C) related to a nasion, and
• wherein the secondarily positioning of the registration image further comprises:
• performing rotation about the x-axis to cause a first line connecting the third landmark (A) and the third landmark (B) to be parallel with the y-axis;
• and
• performing parallel translation of the registration image to cause the third landmark (C) in the rotated registration image to be an origin.