Method and apparatus for changing or mapping video or digital images from one image density to another

摘要

A method and apparatus for resizing digital or stored images initially retrieves a one-dimensional sample of the image, such as a line of pixels. A final image size D is determined so that the absolute value of the original sample size M-2.sup.N *D is a minimum, and where N is an integer greater than or equal to 0. The discrete series of pixels in the line are then converted to a continuous function under a cubic convolution interpolation technique. From the continuous function, intermediate pixel values are determined. Pyramid filtering is employed to filter the intermediate pixel values to a final series of pixel values D. The routine is performed along the opposite dimension so as to alter the size of a two-dimensional stored image.