Title :
Blocking effect reduction of JPEG images by signal adaptive filtering
Author :
Lee, Y.L. ; Kim, H.C. ; Park, H.W.
Author_Institution :
Dept. of Inf. & Commun. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea
fDate :
2/1/1998 12:00:00 AM
Abstract :
A postprocessing algorithm is proposed to reduce the blocking artifacts of Joint Photographic Experts Group (JPEG) decompressed images. The reconstructed images from JPEG compression produce noticeable image degradation near the block boundaries, in particular for highly compressed images, because each block is transformed and quantized independently. The blocking effects are classified into three types of noises in this paper: grid noise, staircase noise, and corner outlier. The proposed postprocessing algorithm, which consists of three stages, reduces these blocking artifacts efficiently. A comparison study between the proposed algorithm and other postprocessing algorithms is made by computer simulation with several JPEG images
Keywords :
adaptive decoding; adaptive filters; digital filters; image reconstruction; interference suppression; noise; JPEG images; block boundaries; blocking effect reduction; corner outlier; decompressed images; grid noise; highly compressed images; image degradation; postprocessing algorithm; reconstructed images; signal adaptive filtering; staircase noise; Adaptive filters; Data compression; Degradation; Discrete cosine transforms; Filtering algorithms; Image coding; Image storage; Noise reduction; PSNR; Transform coding;
Journal_Title :
Image Processing, IEEE Transactions on
