中文说明：离散余弦变换（DCT）是用不同频率的余弦函数和来表示数据点的有限序列。离散余弦变换在科学和工程领域有着广泛的应用
English Description：
A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies. DCTs are important to numerous applications in science and engineering, from Click the file on the left to start the preview,please ！The preview only provides 20% of the code snippets, the complete code needs to be downloaded Loading Report