Separated Component-Based Restoration of Speckled SAR Images Report Title Many coherent imaging modalities such as Synthetic Aperture Radar (SAR) suffer from a multiplicative noise commonly referred to as speckle which often makes the interpretation of data difficult. An effective strategy for speckle reduction is to use a dictionary that can sparsely represent the features in the speckled imag...

A new technique based on superposition of two speckle patterns is proposed and demonstrated for controlled modulation of the spatial polarization distribution of the resultant speckle. It is theoretically and experimentally demonstrated that controlled modulation of the spatial polarization distribution of laser speckle can be achieved by proper choice of the polarization states as well as the ...

Ultrasound-modulated optical tomography based on the measurement of laser-speckle contrast was investigated. An ultrasonic beam was focused into a biological-tissue sample to modulate the laser light passing through the ultrasonic column inside the tissue. The contrast of the speckle pattern formed by the transmitted light was found to depend on the ultrasonic modulation and could be used for i...

The SAR and SAS images are perturbed by a multiplicative noise called speckle, due to the coherent nature of the scattering phenomenon. If the background of an image is uneven, the fixed thresholding technique is not suitable to segment an image using adaptive thresholding method. In this paper a new Adaptive thresholding method is proposed to reduce the speckle noise, preserving the structural...

We present a novel fluorescence microscopy technique that provides depth sectioning in thick tissue. The technique relies on dynamic speckle illumination, and depth sectioning is obtained from an a priori knowledge of speckle statistics. We demonstrate nearconfocal imaging in a mouse brain labeled with green fluorescent protein. Confocal microscopy [1] is a popular technique in the bioimaging c...

BACKGROUND A method capable of determining atherosclerotic plaque composition and measuring plaque viscoelasticity can provide valuable insight into intrinsic features associated with plaque rupture and can enable the identification of high-risk lesions. In this article, we describe a new optical technique, laser speckle imaging (LSI), that measures an index of plaque viscoelasticity. We evalua...

Nowadays Noise is a major factor reducing quality of Medical images like MRI CT Scan Ultrasound etc. various types of Noise present in all medical images like Speckle, Additive noise. Speckle noise is a most commonly present in all medical images including ultrasound images. To extract useful information in the original form so transformations are used. DWT (Discrete wavelet transform) is the N...

The objective of this study was to compare tissue Doppler imaging and speckle tracking ultrasound to assess the relative motion of flexor tendon and surrounding subsynovial connective tissue (SSCT). Twenty normal human wrists were imaged with an ultrasound scanner. The two ultrasound methods measured the excursion and maximum velocity of the tendon and SSCT while subjects gripped three differen...

Use of a copula for generating a sequence of correlated speckle patterns is introduced. The chief characteristic of this algorithm is that it generates a continuous speckle sequence with a specified evolution of the correlation and does so with just two arrays of random numbers. Thus, physically realistic temporally varying speckle patterns with proper first- and second-order statistics are eas...