A deblocking filter similar to the one used in H.264/MPEG-4 AVC is operated within the inter picture prediction loop. However, the design is simplified in regard to its and filtering processes, and is made more friendly to parallel processing [1]. 3.8 Sample adaptive offset (SAO) A nonlinear amplitude mapping is introduced within the interpicture prediction loop after the deblocking filter. Its goal is to better reconstruct the original signal amplitudes by using a look-up table that is described by a few additional parameters that can be determined by histogram analysis at the encoder side [1]. 4. BLOCK ARTIFACT ANALYSIS Block-based transform coding is popularly used in image and video compression standards such as JPEG, MPEG and H.26x because of its excellent energy compaction capability and low hardware complexity [14]. These standards achieve good compression ratio and quality of the reconstructed image and video after quantization is not very coarse. However, in very low bit rates, the annoying artifacts in image and video compression coding occur and degrade the quality. This artifact is called blocking artifact [14]. Blocking is known as one of the most visual and objectionable artifacts of block-based compression methods [16]. In a coding scheme that uses block-based prediction and transform coding, discontinuities can occur in the reconstructed signal at the block boundaries. Visible discontinuities at the block boundaries are blocking artifacts [15]. Figure 10 : Example of block boundary with blocking artifact [15]
A deblocking filter similar to the one used in H.264/MPEG-4 AVC is operated within the inter picture prediction loop. However, the design is simplified in regard to its and filtering processes, and is made more friendly to parallel processing [1]. 3.8 Sample adaptive offset (SAO) A nonlinear amplitude mapping is introduced within the interpicture prediction loop after the deblocking filter. Its goal is to better reconstruct the original signal amplitudes by using a look-up table that is described by a few additional parameters that can be determined by histogram analysis at the encoder side [1]. 4. BLOCK ARTIFACT ANALYSIS Block-based transform coding is popularly used in image and video compression standards such as JPEG, MPEG and H.26x because of its excellent energy compaction capability and low hardware complexity [14]. These standards achieve good compression ratio and quality of the reconstructed image and video after quantization is not very coarse. However, in very low bit rates, the annoying artifacts in image and video compression coding occur and degrade the quality. This artifact is called blocking artifact [14]. Blocking is known as one of the most visual and objectionable artifacts of block-based compression methods [16]. In a coding scheme that uses block-based prediction and transform coding, discontinuities can occur in the reconstructed signal at the block boundaries. Visible discontinuities at the block boundaries are blocking artifacts [15]. Figure 10 : Example of block boundary with blocking artifact [15]
Bhargav_report_proposal.docx