Mean of Median Absolute Derivation Technique for Speckle Noise Variance Estimation in Computerised Tomography Images
نویسندگان
چکیده
منابع مشابه
Speckle Noise Reduction for the Enhancement of Retinal Layers in Optical Coherence Tomography Images
Introduction One of the most important pre-processing steps in optical coherence tomography (OCT) is reducing speckle noise, resulting from multiple scattering of tissues, which degrades the quality of OCT images. Materials and Methods The present study focused on speckle noise reduction and edge detection techniques. Statistical filters with different masks and noise variances were applied on ...
متن کاملNoise Variance Estimation in Images
Figure 3: The distribution of the estimated noise in an image (Lenna) to which noise with a uniform shaped distribution is added. Also shown are the true noise distribution and the theoretically estimated distribution. The latter is obtained by convolving the (truncated) uniform function with a normal function.
متن کاملAutomatic estimation of the noise variance in SAR images for use in speckle filtering
Synthetic Aperture Radar (SAR) is an active imaging system widely used in remote sensing applications. SAR systems are characterized by their high image resolution and all-weather operating ability, but suffer from the notorious speckle noise [1], which is a random multiplicative phenomenon that results from coherent imaging. In this paper we propose several heuristic methods for the estimation...
متن کاملspeckle noise reduction for the enhancement of retinal layers in optical coherence tomography images
introduction one of the most important pre-processing steps in optical coherence tomography (oct) is reducing speckle noise, resulting from multiple scattering of tissues, which degrades the quality of oct images. materials and methods the present study focused on speckle noise reduction and edge detection techniques. statistical filters with different masks and noise variances were applied on ...
متن کامل- Neighbourhood Median Filters to Remove Speckle Noise from CT – Images
Removal of noise from the medical images is very challenging in image processing. In recent years, technological development has improved significantly in analyzing medical imaging. This paper proposes different filtering techniques for the removal of speckle noise from CT medical images by topological approach. The filters are constructed based on metric topological neighbourhood. The quality ...
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: Nigerian Journal of Technology
سال: 2015
ISSN: 2467-8821,0331-8443
DOI: 10.4314/njt.v34i2.22