Real-time rate-control requires fast, accurate characterization of the relationship between wavelet subband step-size and rate. A rate-control algorithm is presented based on local properties of the function parameterizing this relationship, the rate-quantization or R-Q curve, for each subband. The behavior of this function is characterized by using the coder once, with step-sizes close to those that achieve the desired rate, which are determined entirely by a model-based technique. This solution requires a coder, a performance metric (which implies a subband-quantization strategy), and continuously differentiable (C/sup 1/) R-Q curves. This approach differs from some previous approaches in that it is based on local structure of R-Q curves instead of a global property, and does not require any training. The proposed scheme produces step-sizes that achieve rates typically less than half a percent away from the target rate. This method is fast, accurate, coder independent, requires no training, and can be combined with any subband-based quantization scheme.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Fast, accurate rate-control for low-rate wavelet-based image coding via bootstrapping with local probability models


    Contributors:
    Gaubatz, M. (author) / Hemami, S.S. (author)


    Publication date :

    2005-01-01


    Size :

    227766 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




    Fast Rate-Distortion Estimation and Optimization for Wavelet Video Coding

    Jackson, E. S. / Peplow, R. / IEEE | British Library Conference Proceedings | 2003



    Visual data rate gain for wavelet foveated image coding

    Hyungkeuk Lee, / Sanghoon Lee, | IEEE | 2005


    Visual Data Rate Gain for Wavelet Foveated Image Coding

    Lee, H. / Lee, S. | British Library Conference Proceedings | 2005