小波变换在数字机顶盒的应用研究

Application Research of Wavelet Transform in the Digital STB

以小波变换在工程中的应用特点和数字电视知识为铺垫,叙述了数字机顶盒的原理及其解码过程。介绍了离散余弦变换在图像压缩中的正变换及其逆变换,其基本原理是将信号从时域变换到频率域,然后进行量化、存储和传输。讨论了二维离散小波变换在图像压缩中的正变换和其逆变换。

In view of the applying characteristics of wavelet and digital TV of wavelet transform, the principle and the decoding process of digital set top box is described. Then it introduces the forward transform and the backward transform of DCT in picture compress whose principle is transforming the signal form the time-field to frequency-field, then storaging and transforming. The emphasis is to discuss the two dimensional discrete wavelet forward transform and backward transform in picture compress.