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该文简要介绍了四类离散余弦变换,以第二类离散余弦变换的快速算法为基础,从公式上推出了第四类离散余弦变换的快速算法,在运算次数上与直接计算进行了比较,并给出了相应的C程序.“,”Four types of Discrete Cosine Transform was presented in this paper. The fast algorithm of DCT IV was developed from the fast algorithm of DCT II and the ratio reduced on the computational time was given. At last, the C code for the algorithm was provided.