Image analysis – Image compression or coding
Reexamination Certificate
2008-07-08
2011-12-06
Le, Vu (Department: 2624)
Image analysis
Image compression or coding
C382S250000, C382S248000, C375S240190, C375S240200
Reexamination Certificate
active
08073267
ABSTRACT:
Provided is an apparatus and method for transforming between a DCT coefficient and a DWT coefficient. The transforming apparatus includes a first fundamental matrix calculating unit, a second fundamental matrix calculating unit, and a DWT coefficient calculating unit. The first fundamental matrix calculating unit calculates a first fundamental matrix by multiplying an N×N forward DWT transform matrix and an N×N matrix that has diagonal components corresponding to a transpose matrix of an 8×8 DCT transform matrix and the remaining components corresponding to an 8×8 matrix with all elements being zero. The second fundamental matrix calculating unit calculates a second fundamental matrix by multiplying an M×M matrix, which has diagonal components corresponding to an 8×8 DCT transform matrix and the remaining components corresponding to an 8×8 matrix with all elements being zero, and a transpose matrix of an M×M forward DWT transform matrix. The DWT coefficient calculating unit calculates a 2-dimensional 1-level DWT coefficient by multiplying the first fundamental matrix, a 2-dimensional 8×8 DCT transform coefficient, and the second fundamental matrix.
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Lim Sang-Hee
Paik Joonki
Chung-Ang University Industry - Academy Cooperation Foundation
Ladas & Parry LLP
Le Ha
Le Vu
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