一种减少DCT变换块效应现象的高效后处理方法
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摘要
基于DCT变换的图像压缩技术中,解码端重构图像时,图像块边界会出现块效应现象.针对DCT变换产生的块效应现象,提出一种减少块效应的后处理方法.在解码端将图像块构成新的组合块,然后根据组合块的图像特性进行区域划分,再根据区域的不同,分别采用不同系数的中值滤波器来减少块效应现象.实验结果表明,该算法速度快,效率高,实时性强,且有效地减少了DCT压缩算法造成的块效应现象.
In the image compression technology based on DCT transform,when the decoding end reconstructs the image,block boundary will appear block effect.In view of the block effect caused by DCT transform,an adaptive filtering algorithm is put forward.A new composite block of image is constituted at the decoding end.And then based on the characteristics of image combination,block area division is made.According to the area respectively,different coefficient of median filter is used to reduce the block effect.The experimental results show that the algorithm is fast,efficient and real-time.It can effectively reduce the block effect caused by the DCT compression algorithm.
In the image compression technology based on DCT transform,when the decoding end reconstructs the image,block boundary will appear block effect.In view of the block effect caused by DCT transform,an adaptive filtering algorithm is put forward.A new composite block of image is constituted at the decoding end.And then based on the characteristics of image combination,block area division is made.According to the area respectively,different coefficient of median filter is used to reduce the block effect.The experimental results show that the algorithm is fast,efficient and real-time.It can effectively reduce the block effect caused by the DCT compression algorithm.
引文
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[7]严珍珍,刘建军.基于离散余弦变换的图像压缩编码方法及改进[J].计算机技术与发展,2016,26(1):147-149+154.
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[2]赵洁,郭继昌,张艳.利用块效应特征的JPEG图像盲取证研究进展[J].中国图象图形学报,2013,18(6):613-620.
[3]LUO Y,WARD R K.Removing the Blocking Artifacts Ofblock-based DCT Compressed Images[J].IEEETrans on Image Process,2003,12(7):838-842.
[4]张二虎,孟颜,胡军州,等.基于块分类的低码率视频压缩技术中块效应消除算法[J].计算机工程与应用,2002(3):102-103+105.
[5]杨弋,王冠宇.一种改进的基于后处理去除块效应算法[J].电子科技,2012,25(10):93-96+100.
[6]王昆.一种基于变换域的图像压缩改进算法[J].微型电脑应用,2015,31(11):27-28+32+2.
[7]严珍珍,刘建军.基于离散余弦变换的图像压缩编码方法及改进[J].计算机技术与发展,2016,26(1):147-149+154.
[8]唐振华,梁聪,区骋,等.基于DCT域纹理特征的多聚焦图像融合[J].应用科学学报,2015,33(6):628-636.
[9]彭干涛,禹峰,林嘉居.基于DCT变换的图像压缩编码的MATLAB实现[J].通信电源技术,2015,32(6):235-238.