中文说明：找到图像的离散余弦变换。Dct 转换图像空间域转换到频率域的多个应用程序。因为只有真正的部分涉及它优于 foureir 变换技术。
English Description：
To find the Discrete cosine transform of an image. Dct converts the spatial domain image into frequency domain for several applications.Since only real part is involved it is better than the foureir transform technique.