A Discrete Approach to Image Zooming

A discrete algorithm for grayscale image resizing through binary image zooming in 3D space is presented.The method can help to keep the edges and borders in the zoomed image as clear and natural as possible,with arbitrary real positive scaling factors.When an image is enlarged,it can be still with vivid color,and express the appearance of original image faithfully.When the size of an image is reduced,the most important features of the image can also be preserved.Experiments show that the new method is effective,stable and convenient for image zooming,and it is also more advantageous in border and edge preserving compared to many common commercial software.We have applied the algorithm in our medical image processing system.