A POSTPROCESSING TECHNIQUE FOR COMPRESSION ARTIFACT REMOVAL IN IMAGES

nirmal kaur

Abstract


Abstract- Image processing is used to process  information according to limited bandwidth of transmission media and limited capacity of storage devices. Digital image and video are mostly coded using discrete cosine transform(DCT) and discrete wavelet transform(DWT) which provide visual distortion called Artifact.   Due to the huge data requirements for multimedia, it is required to get more compression with less visual defects. The visual artifacts in highly compressed images can be reduced by post processing technique. BDCT is adopted by widely used image/video compression standards such JPEG, MPEG-1, MPEG-2, MPEG-4, H.263 due to its high energy compression, low computational complexity and its ease of implementation. The popular international standard for compression, the Joint Photographers Expert Group (JPEG) can lead to noticeable discontinuities along the boundaries called the ‘blocking artifacts’. In this paper  an analysis is provided for different type of Post-processing techniques and proposes a  simple approach to reduce blocking artifact which occur during the compression in image processing.

 


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