//Clear default text of emty text areas on focus function tFocus(element) { if (element.value == ' '){element.value='';} } //Clear default text of emty text areas on submit function tSubmit(form) { var defaultedElements = document.getElementsByTagName("textarea"); for (var i=0; i != defaultedElements.length; i++){ if (defaultedElements[i].value == ' '){ defaultedElements[i].value='';}} } //Disable pressing 'enter' key to submit a form (otherwise pressing 'enter' causes a submission to start over) function disableEnterKey(e) { var key; if(window.event) key = window.event.keyCode; //Internet Explorer else key = e.which; //Firefox and Netscape if(key == 13) //if "Enter" pressed, then disable! return false; else return true; } Hidden Markov Tree Modeling of Complex Wavelet Transforms
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Hidden Markov Tree Modeling of Complex Wavelet Transforms

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Multiresolution signal and image models such as the hidden Markov tree aim to capture the statistical structure of smooth and singular (edgy) regions. Unfortunately, models based on the orthogonal wavelet transform suffer from shift-variance, making them less accurate and realistic. In this paper, we extend the HMT modeling framework to the complex wavelet transform, which features near shift-invariance and improved angular resolution compared to the standard wavelet transform. The model is computationally efficient (with linear-time computation and processing algorithms) and applicable to general Bayesian inference problems as a prior density for the data. In a simple estimation experiment, the complex wavelet HMT model outperforms a number of high-performance denoising algorithms, including redundant wavelet thresholding (cycle spinning) and the redundant HMT.
Title: Hidden Markov Tree Modeling of Complex Wavelet Transforms
Author: Choi, Hyeokho; Romberg, Justin; Baraniuk, Richard G.; Kingsbury, Nicholas G.
Type: Conference Paper
Keywords: multiresolution signal; image; hidden markov tree (HMT); model; Bayesian; wavlet
Citation: H. Choi, J. Romberg, R. G. Baraniuk and N. G. Kingsbury,"Hidden Markov Tree Modeling of Complex Wavelet Transforms," in IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP),, pp. 133-136.
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Date Published: 2000-06-01

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  • ECE Publications [1043 items]
    Publications by Rice University Electrical and Computer Engineering faculty and graduate students
  • DSP Publications [508 items]
    Publications by Rice Faculty and graduate students in digital signal processing.