Digital image remapping
AssigneeCydar Limited
InventorsMazen Alhrishy, Graeme Penney, Tom Carrell
Life of this patent
Estimating the term…
Abstract
The present invention relates to production of 2D digital images suitable for use in medical imaging. The invention particularly relates to remapping X-ray images taken from a first viewpoint so that they present the same image as seen from a second viewpoint. Remapping is achieved by registering separate 2D images taken from the first and second viewpoints of an area with a 3D scan volume of the same region to ascertain their relative viewpoints with respect to the 3D scan volume. The image taken with respect to the first viewpoint is then remapped to yield the image as seen from the second viewpoint.
Claims12
An image generation method comprising:
- a) obtaining single first and single second 2D images through an object to be imaged, wherein the images are from different viewpoints with respect to the object;
- b) providing a 3D image data set of the object to be imaged;
- c) defining a remapping surface within the 3D image data set;
- d) registering the first and second 2D images with the 3D image data set and determining a viewpoint of the first and second 2D images with respect to the 3D image data set;
- and
- e) remapping pixels of the first 2D image to generate a remapped 2D image from the viewpoint of the second 2D image by:
- i. back projecting rays from the pixels of the first 2D image and determining the points of intersection of the back projected rays with the remapping surface;
- and
- ii. remapping the pixels of the first 2D image corresponding to the points of intersection to generate the 2D remapped image, whereby the pixels of the first 2D image are remapped according to the direction of rays projected from the viewpoint of the second 2D image via the intersection points corresponding to each pixel.
An imaging system, comprising:
- a 2D imaging system arranged in use to obtain 2D images;
- and
- a processor, arranged in use to:
- a) obtain single first and single second 2D images through an object to be imaged, wherein the images are from different viewpoints with respect to the object;
- b) obtain a 3D image data set of the object to be imaged;
- c) define a remapping surface within the 3D image data set;
- d) register the first and second 2D images with the 3D image data set and determine the viewpoint of the first and second 2D images with respect to the 3D image data set;
- and
- e) remap pixels of the first 2D image to generate a remapped 2D image from a viewpoint of the second 2D image by:
- i. back projecting rays from the pixels of the first 2D image and determining the points of intersection of the back projected rays with the remapping surface;
- and
- ii. remapping the pixels of the first 2D image corresponding to the points of intersection to generate the 2D remapped image, whereby the pixels of the first 2D image are remapped according to the direction of rays projected from the viewpoint of the second 2D image via the intersection points corresponding to each pixel.
Dependencies are inferred from the claim text.