卫星解码数字图像块效应计算机后处理方法

Computer post-processing method for blocking-artifact in satellite decoded images

分块余弦变换 ( BDCT)已经被广泛应用于国际图像压缩标准并取得了良好的效果。然而 ,在有损图像处理中都存在着块效应问题。为了消除卫星数字图像块效应 ,这里结合卫星图像的特点 ,在文献 [4 ]的DCT后处理方法基础上进行改进 ,提出一种改进的解码图像块效应后处理方法。此方法不仅可以减少卫星图像块效应和提高图像质量 ,而且减少了 DCT块效应后处理时间 ,提高了解码图像后处理效率。

BDCT has been widely used for International Standard of image compression and achieved effective result. However, there exists blocking-artifact problem in loss decoded image processing. In order to reduce satellite image blocking-artifact, the improved blocking-artifact post-processing algorithm based on DCT post-processing method[4] has been proposed, according to the characteristic of the satellite image. The algorithm can not only reduce the blocking-artifact and improve the image quality, but can also save the post-processing time for DCT blocking-artifact and improve the efficiency. This algorithm is extensively useful.