Analysis of low bit rate image transform coding

Analysis of low bit rate image transform coding

Calculations based on high-resolution quantizations prove that the distortion rate D( R) of an image transform coding is proportional to 2 2 R when R is large enough. In wavelet and block cosine bases, we show that if R < 1 bit/pixel, then D( R) varies like R1 2 , where remains of the order of 1 for most natural images. The improved performance of embedded codings in wavelet bases is analyzed. ...

Analysis of Low Bit Rate Image Transform Coding - Signal Processing, IEEE Transactions on

Calculations based on high-resolution quantizations prove that the distortion rate D( R) of an image transform coding is proportional to 2 2 R when R is large enough. In wavelet and block cosine bases, we show that if R < 1 bit/pixel, then D( R) varies like R1 2 , where remains of the order of 1 for most natural images. The improved performance of embedded codings in wavelet bases is analyzed. ...

Hybrid transform coder for low bit rate speech coding

Low Bit Rate Video Coding with Geometric Transform

This paper describes how the combination of geometric transformations in both the spatial and pixel domains can be used for video coding. The geometric transformation applied in the spatial domain is able to track movements such that, for low bit rate video coding, the motion vectors alone can be used to represent a complex motion of moving objects. The introduction of such a transformation in ...

On Low Bit-Rate Coding Using the Contourlet Transform

In this work, we study and analyze the contourlet transform for low bit-rate image coding. This image-based geometrical transform has been recently introduced to efficiently represent images with a spars set of coefficients. In order to explore the potentiality of this new transform as a tool for image coding, we developed a direct coding scheme that is based on using non-linear approximation o...