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本文提出了一种新的二维奇余弦变换公式．这种二维奇余弦变换由Ｗ．Ｋ．Ｐｒａｔｔ提出，但原变换公式有误，对此本文进行了证明。
This paper presents a new two-dimensional cosine transform formula. This two-dimensional odd cosine transform by W. K. Pratt proposed, but the original transformation formula is wrong, this paper proves.