Apparatus and method for determining measure of similarity between images
AssigneeAccuray Incorporated
InventorsDongshan Fu, Gopinath Kuduvalli
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Abstract
A method and system is presented in image-guided radiosurgery for determining the measure of similarity of two digital images, for example a 2D x-ray image and a 2D DRR synthesized from 3D scan data. A two-dimensional array of pixel values of a difference image may be formed by subtracting each pixel value of the second image from the corresponding pixel value of the first image. The pattern intensity function may be constructed by taking the summation of functions of the gradients of the difference image. The neighborhood R may be defined so as to allow the gradients of the difference image to be considered in at least one direction.
Claims20
A method in image-guided radiation treatment, comprising:
- determining a measure of similarity of a first image of an object and a second image of the object, wherein each of the first image and the second image has pixel values, and wherein determining the measure of similarity comprises:
- forming a difference image by subtracting corresponding pixel values of the second image from each pixel value of the first image;
- and
- forming a pattern intensity function over all the pixels in the difference image within a neighborhood.
A computer readable medium storing software that provides instructions which, if executed, performs operations comprising:
- determining a measure of similarity of a first image of an object and a second image of the object, wherein each of the first image and the second image has pixel values, and wherein determining the measure of similarity comprises:
- forming a difference image by subtracting corresponding pixel values of the second image from each pixel value of the first image;
- and
- forming a pattern intensity function over all the pixels in the difference image within a neighborhood.
Dependencies are inferred from the claim text.