Image processing is any form of signal processing for which the input is an image, such as a photograph or video frame; the output of image processing may be either an image or a set of characteristics or parameters related to the image. On the other hand, the digital image has been treated by various scenes in not only the industry and the society but also people's daily life today, and there have been a lot of equipments that treat the digital images. Thus, converting the resolution of the image according to the size of image on the display of the equipment has been meaningful. In this paper, we investigate the technique for the enlargement of the images by using the DCT, and show some experimental results.
