Method for resizing an image

摘要

A method for resizing an image is disclosed. In a preferred embodiment, the method projects the image onto a lateral surface of a three-dimensional cylinder to transform the image into a three-dimensional image. Then, the method applies perspective projection (with a chosen viewpoint) to transform the three-dimensional image back to a two-dimensional image, based on which a final resized image is generated. By carefully choosing the diameter of the three-dimensional cylinder and the coordinate of the viewpoint, a rectangular shaped image may be resized into a square-shaped image.

主权项

1. A method performed by a processor for resizing a digital image comprising:
transforming the digital image into a 3D image by projecting the digital image onto a lateral surface of a 3D cylinder, wherein for each pixel (x, y) of the digital image the corresponding pixel of the 3D image is (R*sin(x/R), y, R*cos(x/R)), wherein R is the radius of the 3D cylinder; applying perspective projection to transform the 3D image into a 2D image, wherein the 2D image has a plurality of original edges; and calculating a plurality of new edges for the 2D image, wherein the plurality of new edges form a rectangular shape which fully covers the 2D image, and wherein the plurality of new edges and plurality of original edges of the 2D image form a plurality of areas.