Results 261 to 270 of about 52,858 (287)
Some of the next articles are maybe not open access.
Speckle reduction by energy time–frequency filtering
Ultrasonics, 2004Structural noise is a very important limitation to the visibility of flaw echoes in ultrasonic testing and evaluation of highly scattering materials. In order to enhance the signal-to-noise ratio, different algorithms have been developed. One of these techniques is based on filtering the spectrum low band of the received echo to obtain a significant ...
M A G, Izquierdo +3 more
openaire +2 more sources
Reduction of speckle noise in multiwavelength contouring
Applied Optics, 2012We report on a method that can be used to improve the result of multiwavelength contouring in the case of objects with rough surface. It is based on the combined evaluation of multiple measurements with varying direction of illumination. While the individual measurements share the same systematics with respect to the shape of the investigated object ...
Claas, Falldorf +3 more
openaire +2 more sources
Ultrasound speckle reduction using modified gabor filters
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2007B-mode ultrasound images are characterized by speckle artifact, which may make the interpretation of images difficult. One widely used method for ultrasound speckle reduction is the split spectrum processing (SSP), but the use of one-dimensional (1-D), narrow-band filters makes the resultant image experience a significant resolution loss.
Ricardo G, Dantas, Eduardo T, Costa
openaire +2 more sources
Speckle Noise Reduction by Random Phase Shifters
Japanese Journal of Applied Physics, 1974Experimental results are given that show that a random phase shifter (RPS) is effective in reducing speckle noise caused by optical defects in coherent imaging systems, including holographic imaging systems. Here the RPS is composed of many tiny transparent blocks, each of which gives a definite phase shift such as O or pi to the transmitting light ...
openaire +2 more sources
Speckle reduction in laser projection based on a rotating ball lens
Optics and Laser Technology, 2021Linxiao Deng, Wen-Tan Fang, Hai Ming
exaly
Opportunities and Strategies for Breast Cancer Prevention Through Risk Reduction
Ca-A Cancer Journal for Clinicians, 2008Eleni Linos
exaly
MuLoG, or How to Apply Gaussian Denoisers to Multi-Channel SAR Speckle Reduction?
IEEE Transactions on Image Processing, 2017Charles-Alban Deledalle +2 more
exaly