关键词: 图像放大, 保持边缘, 内插算法, 行缓存

Abstract: In order to meet the need of low-cost digital video processing chip,the paper presented a new edge preserving enlargement algorithm using two line buffers．First, a representation point was found to present interpolation point. Next, relevant direction of the representation point was found. Then, four points of this direction and new position relationship were calculated. Last, interpolation algorithm was used. The experimental results demonstrate that the algorithm can not only preserve the edge effectively，but also remove the edge blur． It can be used in the low-cost chip of digital video processing．

Key words: image enlargement, edge preserving, interpolation algorithm, line buffer