Image analysis – Image compression or coding – Transform coding
Patent
1997-11-07
1999-03-23
Boudreau, Leo H.
Image analysis
Image compression or coding
Transform coding
382240, 382276, G06K 936, G06K 946
Patent
active
058870849
ABSTRACT:
A method or system for structuring an image which corresponds to an original array of pixels, as a forward discrete even cosine transform (DCT) pyramid having a predetermined number of levels where each level is associated with a different DCT frequency band, includes, respectively, the steps or functionality of: partitioning the original array into blocks of overlapped pixels; taking a DCT of each block of overlapped pixels to generate blocks of first level DCT coefficients forming a first level of the DCT pyramid; storing the first level of the DCT pyramid; selecting and storing at least one of the first level DCT coefficients of each block of first level DCT coefficients into a first temporary array; partitioning the first temporary array into blocks of overlapped coefficients; and taking a DCT of each block of overlapped coefficients of the first temporary array to generate blocks of second level DCT coefficients forming a second level of the DCT pyramid. Additional levels can be created by repeating the previous steps, and the processed image can be restored by reversing the above sequence of steps using inverse discrete even cosine transforms.
REFERENCES:
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patent: 5020120 (1991-05-01), Weldy
patent: 5327242 (1994-07-01), Naimpally et al.
patent: 5461655 (1995-10-01), Vuylsteke et al.
"The Lapacian Pyramid as a Compact Image Code" by Peter J. Burt & Edward H. Adelson IEEE Transactions on Communications, vol. Com-31, No. 4, Apr. 1983, pp. 532-540.
"Two-Dimensional Signal and Image Processing" by Jae S. Lim, 1990 Prentice-Hall Inc. pp. 527-549 and pp. 562-567.
Hajjahmad Ibrahim
Reisch Michael L.
Sunshine Lon E.
Wober Munib A.
Yang Yibing
Boudreau Leo H.
Mofford Donald F.
Novik Dmitry A.
Polaroid Corporation
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