Abstract: Bicubic interpolation is an effective way to get well-qualified high-resolution image, but with high calculation load. The common used interpolation methods are discussed. A new region-based bicubic interpolation is proposed. Without segmenting the image, the mean value of the four neighboring points of the interpolated point is calculated which is used to divide the image into two regions: the flat region and the complex region with more details. Two different interpolating algorithms are chosen for each region. Experimental results show that the proposed algorithm can keep the image quality equal to the original algorithm while reducing the calculation load more than 10 percents. It is useful for applications.

Key words: image zooming, bicubic interpolation, region-based

摘要： 采用双三次插值实现图像放大具有较高的图像质量，但运算量很大。在分析常用插值算法的基础上，提出一种基于区域的双三次插值算法。该算法避免进行图像分割，通过被插值点四邻域像素的均值来划分图像的平坦区域和纹理细节复杂区域，采用不同的插值算法进行计算。实验结果表明，与传统的双三次插值算法相比，该算法在保持放大后图像质量的同时，运算量降低10%以上，具有一定的实用价值。

关键词: 图像放大, 双三次插值, 基于区域

CLC Number: 

• TP391