US 7,031,505 B2 · Perspective with shear warp

Abstract

The present invention relates to a method for generating an 2-D projection directly from a 3-D volume data, the method comprising the steps of determining a viewing direction vector in a viewing frustum, determining a major axis of the direction vector, resampling the volume data in the direction of the major axis, applying a shear factorization to the resampled data; and rendering the factorized data. The method provides a singularly warped image which avoids have to patch images from multiple warp functions which, in turn, improves the quality of the final image. Finally, the image allows a scene to be rendered from within the scene itself. The invention can be applied to medical imaging and enable a surgeon to view an image such as a CT scan with perspective as well as from within the scan itself, providing the surgeon with an invaluable tool.

Claims39

Dependent claims

A method for generating a 2-D image projection directly from a 3-D volume data, the method comprising the steps of:

a) determining a viewing direction vector in a viewing frustum, the viewing frustum containing a plurality of viewing vectors;
b) determining a major axis of the viewing direction vector;
c) re-sampling a selected set of the viewing vectors in the volume data with a refined grid according to a selected image parameter, the re-sampling in a direction of said major axis, the image parameter being selected so as to provide each vector of the selected set of viewing vectors with the same major axis as the direction vector;
d) applying a shear factorization to the re-sampled data according to the selected image parameter, and
e) applying a warp operator for rendering the factorized data to produce said 2-D image projection.

2 more elements

Dependencies are inferred from the claim text.

Perspective with shear warp

Life of this patent

Perspective with shear warp

Life of this patent

Abstract

Claims39