Research Of Image Zoom Algorithm And Its Implementation On FPGA

Image zooming plays an important role in the field of image processing. Both image resolution adjustment and format conversion need the image zooming technique. With the rapid advancement of multimedia and integrated circuit, video zooming in arbitrary expansion has been an important subject in image processing field.Interpolation techniques are always used to realize image zooming. Because of the limitations in classical interpolation theory, ringing artifacts and edge blurring near edges will be introduced using these classical interpolation techniques. Lots of improved methods are proposed to enhance edge processing, while only 2k zooming can be carried out. In other words, arbitrary expansion based on edge improvement can't be completed using these methods.In order to realize arbitrary expansion based on edge improvement, 5 parts of research work have been done in this paper:1. Image zooming techniques have been reviewed systematically including classical image zooming techniques and multi-edge detection zooming technique. The relative merits of these algorithms have been analyzed in this paper.2. Oriented polynomial interpolation algorithm has been researched, which can realize arbitrary expansion based on special edge processing.3. IOPI algorithm (Improved oriented polynomial interpolation algorithm) has been proposed in this paper. For FPGA implementation, two improvements have been made basing on oriented polynomial interpolation algorithm. The first improvement is using EDV method (Edge direction vector, proposed by this paper) to simplify the edge orientation. In order to improve non-oriented...