The results indicate that the discrete cosine transform has a good compressibility to NIR spectra of tea.

结果表明，离散余弦变换对近红外光谱具有较强的压缩能力。

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The discrete cosine transform (DCT) is an important mathematical tool in digital image processing and many other fields.

离散余弦变换(DCT)是数字图像处理等许多领域的重要数学工具。

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So the fast algorithms of discrete sine transform, the discrete cosine transform and the discrete W transform are unified.

这样，离散余弦、离散正弦、离散w变换快速算法就有了一个统一的格式。

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