Image Magnification based on Directed Linear Interpolation

The technology of computer graphics and digital cameras are prevalent. High-resolution display and printer are available. High-resolution images are needed in order to produce high quality display images and high quality prints for use in desktop publishing, large artistic printing, mobile phone etc. However, since high-resolution images are not usually provided, there is a need to magnify the original images. This paper proposes an algorithm for image magnification by linear interpolation, which is better than some of the prevalent methods such as pixel replication, bilinear interpolation and bicubic interpolation. The proposed algorithm uses linear interpolation method to magnify pixels that lie in the perimeter, whereas it uses directed bilinear interpolation method to magnify the interior region inside the magnified blocks. Determination of the right direction for interpolation is the key for achieving better performance of the proposed algorithm.