Application of a wavelet thresholding algorithm for contrast enhancement of mammograms

2013 ◽  
Author(s):  
Amutha Somasundaram ◽  
Amaresha Shridhar Konar ◽  
Radhakrishna Anantha Padmanabha ◽  
Ramesh Babu D.R ◽  
Sairam Geethanath
Keyword(s):  
Contrast Enhancement ◽  
Wavelet Thresholding ◽  
Thresholding Algorithm

scholarly journals New Wavelet Thresholding Algorithm in Dropping Ambient Noise from Underwater Acoustic Signals

2015 ◽  
Vol 07 (03) ◽  
pp. 53-60 ◽  
Author(s):  
Mohammad Monirujjaman Khan ◽  
Ratil Hasnat Ashique ◽  
Badrun Naher Liya ◽  
Md. Mohsin Sajjad ◽  
Md. Anisur Rahman ◽  
...  
Keyword(s):  
Ambient Noise ◽  
Acoustic Signals ◽  
Wavelet Thresholding ◽  
Underwater Acoustic ◽  
Thresholding Algorithm

Application of Adaptive Wavelet Thresholding to Ultrasonic Signal Compression of Aluminum Alloy Forgings

2013 ◽  
Vol 658 ◽  
pp. 89-92
Author(s):  
Shou Shan Liu ◽  
Chuan Jiang Wang ◽  
Li Jun Bi ◽  
Chang Zhi Lv
Keyword(s):  
Aluminum Alloy ◽  
Ultrasonic Signal ◽  
Wavelet Thresholding ◽  
Signal Compression ◽  
Hard Thresholding ◽  
Coherent Noise ◽  
Adaptive Wavelet ◽  
Effective Signal ◽  
Thresholding Algorithm ◽  
The Mathematical Model

In this paper, for the purpose of ultrasonic signal compression and the coherent noise depressing in nondestructive test of aluminum alloy forging, the mathematical model of defect echoes is discussed and confirmed. And then the wavelet kernel is also confirmed according the waveform of the defect echoes. As the algorithms of standard hard thresholding and soft thresholding of wavelet transform can not bring out effective compression and depression to the coherent noise, an adaptive wavelet thresholding algorithm is introduced. Experimental results indicate that the adaptive wavelet thresholding algorithm can offer effective signal compression and depression to the coherent noise.

An Energy Analyser for Contrast Enhancement in STEM

1974 ◽  
Vol 32 ◽  
pp. 434-435
Author(s):  
H.T. Pearce-Percy
Keyword(s):  
Contrast Enhancement ◽  
Bending Angle ◽  
Magnetic Sector ◽  
Conventional Design ◽  
Bending Radius ◽  
Sector Type

Recently an energy analyser of the uniform magnetic sector type has been installd in a 100KV microscope. This microscope can be used in the STEM mode. The sector is of conventional design (Fig. 1). The bending angle was chosen to be 90° for ease of construction. The bending radius (ρ) is 20 cm. and the object and image distances are 42.5 cm. and 30.0 cm. respectively.

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