Chung Ang University Industry Academic Cooperation

Sang-Hee Lim

Joonki Paik

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&#xd7;N forward DWT transform matrix and an N&#xd7;N matrix that has diagonal components corresponding to a transpose matrix of an 8&#xd7;8 DCT transform matrix and the remaining components corresponding to an 8&#xd7;8 matrix with all elements being zero. The second fundamental matrix calculating unit calculates a second fundamental matrix by multiplying an M&#xd7;M matrix, which has diagonal components corresponding to an 8&#xd7;8 DCT transform matrix and the remaining components corresponding to an 8&#xd7;8 matrix with all elements being zero, and a transpose matrix of an M&#xd7;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&#xd7;8 DCT transform coefficient, and the second fundamental matrix.

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Seoul, South Korea

Sang-Hee Lim