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使用提升的方法 ,利用 FFT( fast Fourier transform)的蝶型构造 ,完成了 FFT与 DCT( discrete cosinetransform)的从整数到整数的变换 .变换本身是可逆的 ,因此非常适合于无失真图像压缩
Using the lifting method, FFT (fast Fourier transform) butterfly structure is used to transform from integer to integer in discrete cosine transform (FFT) and DCT (transform in itself is reversible), so it is very suitable for distortionless image compression