The thesis introduced principle and effect of DCT/IDCT in image processing at first, and further elaborated the advantages of DCT transform.

• 本文首先介绍了DCT和IDCT在图像处理中的作用和原理,详细说明了DCT变换实现图像压缩的过程,并与其它变换比较说明了用DCT变换实现图像压缩的优势。