Design Of Image Stitching System Based On FPGA

Image stitching is an approach that splices several images with a certain degree of overlap into a single image. In recent years, as this approach is widely used in remote sensing images, military affairs, medical science, indoor multimedia, entertainment venues, the image stitching algorithms have gotten developed rapidly.The whole system is realized on Altera’s FPGA. Around the FPGA, there are several DDR2 SDRAM chips used for image date cache.In this paper, the image date is processed by several classical approaches, like coordinate transformation, image stitching and then displayed the processed image on LCD.The coordinate transformation is to transform a kind of coordinate to another kind of coordinate. There are three main methods of coordinate transformations: spherical projection, cylindrical projection and cubic projection. However, the spherical projection and cubic projection will cause high cost because the algorithms of them are very complex and they require a large view angle of the camera, which is difficult to achieve. Therefore, in this project, the cylindrical projection is focused on and then it is realized on FPGA.Image registration is mainly about to process images which covered the same areas and then get some data like translation and rotation. In this paper, two algorithms about image registration are introduced. One is based on Phase-Matching Method and the other is based on Gray Feature Matching Method.Image fusion is an approach that aims at fusing several images with the same scene and different characteristics into an image. In this paper, the method of image fusion is used to remove the pixel values on joint together place. And then it realize the purpose that smooth transition from one image to another.FPGA-based image stitching system is easy algorithm, lower cost and more real-timeand this approach described in this paper will have significant applications in security and tracking systems.