Selective Weighting of Undecimated Wavelet Coefficients for Noise Reduction in SAR Interferograms
نویسندگان
چکیده
منابع مشابه
Selective Weighting of Undecimated Wavelet Coefficients for Noise Reduction in SAR Interferograms
This paper describes a technique for noise reduction in synthetic aperture radar interferometry. The noisy interferogram is decomposed using undecimated wavelet transform and the coefficients are weighted. A novel method for computing the weights for each subband, based on an estimate of the relative noise content in them, is presented with a median filter used as the noise estimator. The propo...
متن کاملNoise Reduction Using an Undecimated Discrete
A new nonlinear noise reduction method is presented that uses the discrete wavelet transform. Similar to Donoho and Johnstone, we employ thresholding in the wavelet transform domain but, following a suggestion by Coifman, we use an undecimated, shift-invariant, nonorthogonal wavelet transform instead of the usual orthogonal one. This new approach can be interpreted as a repeated application of ...
متن کاملAssessment of the Wavelet Transform for Noise Reduction in Simulated PET Images
Introduction: An efficient method of tomographic imaging in nuclear medicine is positron emission tomography (PET). Compared to SPECT, PET has the advantages of higher levels of sensitivity, spatial resolution and more accurate quantification. However, high noise levels in the image limit its diagnostic utility. Noise removal in nuclear medicine is traditionally based on Fourier decomposition o...
متن کاملFilm grain reduction on colour images using undecimated wavelet transform
The presence of film grain often imposes the crucial quality choice between film enlargement and speed. In this work we present an automatic technique for reducing the amount of grain on film images. The technique reduces the noise by thresholding the wavelet components of the image with parameterised family of functions obtained with an initial training on a set of images. The training produce...
متن کاملAn Insitu Single-pointed Wavelet-based Method for Noise Reduction in Sar Images
Speckle noise caused by interference of electromagnetic waves complicates Synthetic aperture radar (SAR) images to be interpreted and further practical application, therefore reducing speckle noise and preserving more detailed information are indispensable tasks in pre-processing. In this paper, a new insitu single-pointed (ISPW) method based on wavelet decomposition to several scales to suppre...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: EURASIP Journal on Advances in Signal Processing
سال: 2008
ISSN: 1687-6180
DOI: 10.1155/2008/378092