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    JPEG Compression History Estimation for Color Images

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    Author
    Neelamani, Ramesh; de Queiroz, Ricardo; Fan, Zhigang; Dash, Sanjeeb; Baraniuk, Richard G.
    Date
    2006
    Abstract
    We routinely encounter digital color images that were previously JPEG-compressed. En route to the image's current representation, the previous JPEG compression's various settings—termed its JPEG compression history (CH)—are often discarded after the JPEG decompression step. Given a JPEG-decompressed color image, this paper aims to estimate its lost JPEG CH. We observe that the previous JPEG compression's quantization step introduces a lattice structure in the discrete cosine transform (DCT) domain. This paper proposes two approaches that exploit this structure to solve the JPEG Compression History Estimation (CHEst) problem. First, we design a statistical dictionary-based CHEst algorithm that tests the various CHs in a dictionary and selects the maximum a posteriori estimate. Second, for cases where the DCT coefficients closely conform to a 3-D parallelepiped lattice, we design a blind lattice-based CHEst algorithm. The blind algorithm exploits the fact that the JPEG CH is encoded in the nearly orthogonal bases for the 3-D lattice and employs novel lattice algorithms and recent results on nearly orthogonal lattice bases to estimate the CH. Both algorithms provide robust JPEG CHEst performance in practice. Simulations demonstrate that JPEG CHEst can be extremely useful in JPEG recompression; the estimated CH allows us to recompress a JPEG-decompressed image with minimal distortion (large signal-to-noise-ratio) and simultaneously achieve a small file-size.
    Description
    Journal Paper
    Citation
    R. Neelamani, R. de Queiroz, Z. Fan, S. Dash and R. G. Baraniuk, "JPEG Compression History Estimation for Color Images," IEEE Transactions on Image Processing, 2006.
    Published Version
    http://dx.doi.org/10.1109/TIP.2005.864171
    Keyword
    JPEG; compression; color; history; recompression; More... lattice; quantization; Image Processing and Pattern analysis; JPEG; compression; color; history; recompression; lattice; quantization Less...
    Type
    Journal article
    Citable link to this page
    https://hdl.handle.net/1911/20147
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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map