@inproceedings {333,
	title = {Deblocking of block-transform compressed images using phase-adaptive shifted thresholding},
	booktitle = {IEEE International Symposium on Multimedia},
	year = {2008},
	abstract = {<p>Many popular image compression schemes are based on block-transform coding, a technique where images are broken into small blocks of pixels prior to transformation and compression. Block-transform coding often introduces blocking artifacts which are particularly prevalent at low bit-rates due to quantization errors. A novel algorithm for deblocking block-transform compressed images is proposed in this paper. This algorithm is based on a phase-adaptive, shifted thresholding technique that estimates the original uncompressed image as the weighted sum of shifted versions of the decompressed image subjected to a threshold. An efficient integer transform is used to construct the shifted versions of the decompressed image. The aggregation weights are obtained adaptively using the local phase moment characteristics of the underlying image content. The proposed algorithm utilizes important human perceptual characteristics to provide effective image deblocking while preserving image detail. Experimental results show that the proposed algorithm is more efficient than comparable methods and yields both subjective results and peak signal-to-noise ratio (PSNR) results comparable to existing methods.</p>
},
	keywords = {aggregation weight, block-transform coding, block-transform image compression deblocking, data compression, human perceptual characteristics, image coding, image segmentation, integer transform, local phase moment, phase-adaptive shifted thresholding, quantisation (signal), quantization error, transforms},
	doi = {http://dx.doi.org/10.1109/ISM.2008.74},
	author = {A Wong and W Bishop}
}
@inproceedings {364,
	title = {A hardware implementation of real-time video deblocking using shifted thresholding},
	booktitle = {20th Canadian Conference on Electrical and Computer Engineering},
	year = {2007},
	abstract = {<p>Video compression has become very important as demand has increased for the storage and transmission of digital video content. Popular video compression schemes like MPEG encoding make use of block-transform coding techniques which are susceptible to blocking artifacts. Recently, an efficient deblocking algorithm based on the concept of shifted thresholding has been proposed. This algorithm uses only integer arithmetic and replaces division operations with bit shifting. This paper proposes a new hardware architecture for the implementation of video deblocking using shifted thresholding. A prototype system for high performance video deblocking using a FPGA (field programmable gate array) board is described. The prototype system leverages the reduced hardware complexity of the shifted thresholding algorithm to cost-effectively implement video deblocking on a FPGA board.</p>
},
	keywords = {bit shifting operation, block codes, block-transform coding technique, computer architecture, data compression, digital arithmetic, digital video content transmission, division operation, field programmable gate array board, field programmable gate arrays, FPGA board, hardware architecture, hardware complexity, integer arithmetic operation, MPEG encoding, multimedia communication, real-time video deblocking algorithm, shifted thresholding algorithm, transform coding, video coding, video communication, video compression},
	doi = {http://dx.doi.org/10.1109/CCECE.2007.14},
	author = {M Hansen and A Wong and W Bishop}
}
