正交变换技术已在数字信号的各个领域中得到了多方面的应用，尤其在数据压缩压缩领域。
Quartered transform technique has been applied in many fields of digital signal especially in the field of data compression.
DCT是一种被广泛应用于图像压缩编码中的正交变换。
DCT is an orthogonal transformation widely used in image compression applications.
王中德(1989)推广了矩阵直积，给出了矩阵第二类直积和第三类直积运算，并将此运算应用于正交变换的构造。
The matrix direct product is generalized and two kinds of direct products are given by Wang Zhongde (1989). These two kinds of direct products are applied to the construction of orthogonal transforms.
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