Results 321 to 330 of about 1,689,718 (367)

Speckle noise reduction for ultrasonic images

SMC'03 Conference Proceedings. 2003 IEEE International Conference on Systems, Man and Cybernetics. Conference Theme - System Security and Assurance (Cat. No.03CH37483), 2004
This paper presents a method to enhance ultrasonic images that are commonly plagued with a special type of acoustic noise called speckles. To reduce the noise effect, filters such as the weighted median filter, adaptive trimmed mean filter, two dimensional weighted Savitzky-Golay filter (2D-WSGF) have been studied.
null Chung-Chang Wu, null Chun-Jun Huang, null Jung-Hua Wang   +2 more
openaire   +1 more source

Speckle noise reduction for digital holographic images using multi-scale convolutional neural networks.

Optics Letters, 2018
In this Letter, we propose a fast speckle noise reduction method with only a single reconstructed image based on convolutional neural networks. The proposed network has multi-sized kernels that can capture the speckle noise component effectively from ...
Wonseok Jeon, Wooyoung Jeong, Kyungchan Son, Hyunseok Yang   +3 more
semanticscholar   +1 more source

Evaluation of denoising techniques to remove speckle and Gaussian noise from dermoscopy images

Comput. Biol. Medicine, 2023
Evgin Göçeri
semanticscholar   +1 more source

Speckle noise reduction in digital speckle pattern interferometric fringes by nonlocal means and its related adaptive kernel-based methods.

Applied Optics, 2018
Digital speckle pattern interferometry (DSPI) is widely used in many scientific and industrial applications. Besides its several advantages, one of the basic problems encountered in DSPI is the undesired speckle noise existing in the fringe pattern.
Y. Tounsi, Manoj Kumar, A. Nassim, F. Mendoza-Santoyo   +3 more
semanticscholar   +1 more source

Edge detection in ultrasound speckle noise

Proceedings of 1st International Conference on Image Processing, 2002
Presents a statistical approach to edge detection in ultrasound speckle, and uses actual noise statistics to derive an expression for an optimal detection rule. The authors compute the optimal detector for the special case of uncorrelated speckle, and an approximation to the optimal detector for the case when signal-to-noise ratio (SNR) is high.
R.N. Czerwinski, D.L. Jones, W.D. O'Brien   +2 more
openaire   +1 more source

Non-Gaussian statistics of speckle noise of Young's fringes in speckle velocimetry

Applied Optics, 1985
In speckle velocimetry, Young's fringes observed during analysis of the multiple-exposure photographs of tracer particles seeding a fluid flow are embedded in a speckle noise that renders their analysis difficult. Some first- and second-order statistical properties of this speckle background are considered in this paper.
openaire   +2 more sources

Speckle Noise Reduction Using PM Pulses

1989
The ultrasonic diagnostic equipment using the pulse echo method has recently come into wide use, and it is used at most hospitals now. It has such advantages as (l)involving no fear of being exposed to X-ray, and (2)making it possible to obtain the tomogram of the living body in real time.
Akihisa Ohya, Shin’ichi Yuta, Iwaki Akiyama, Takashi Itoh, Masato Nakajima   +4 more
openaire   +1 more source

Speckle noise removal by robust modeling

Proceedings 2003 International Conference on Image Processing (Cat. No.03CH37429), 2004
A robust modeling approach is applied to remove speckle noise in synthetic aperture images. Conventional adaptive filtering approaches in speckle filtering smoothes the image selectively depending on the details of underlying textures, and tend to blur details after speckle removal.
openaire   +1 more source

Intrinsic speckle noise in off-axis particle holography

Journal of the Optical Society of America A, 2004
In holographic imaging of particle fields, the interference among coherent wave fronts associated with particle scattering gives rise to intrinsic speckle noise, which sets a fundamental limit on the amount of information that particle holography can deliver.
Ye, Pu, Hui, Meng
openaire   +2 more sources

Speckle noise in highly corrected coronagraphs

SPIE Proceedings, 2004
Speckles in a highly corrected adaptive optic imaging system have been studied through numerical simulations and through analytic and algebraic investigations of the Fourier-optical expressions connecting pupil plane and focal plane, which simplify at high Strehl ratio.
openaire   +1 more source