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Details of the algorithm are found in this paper:
Deringing and deblocking DCT compression artifacts with
efficient shifted transforms, R. Samadani, A. Sundararajan and
A. Said, IEEE Int. Conf. on Image Processing (ICIP),
Singapore, October 2004 (pdf).
Estimating the Q tables when they are not available in the image
file is described in this paper:
Characterizing and estimating block DCT image compression
quantization parameters
R. Samadani., 39th Asilomar Conference on Signals, Systems and
Computer, 30 Oct.-2 Nov. 2005, Pacific Grove, CA, USA, pp. 1230-4
(technical report
pdf).
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