Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Noise


Proposed Algorithm for Image Noise Detection Based on Recursive Matrix

Hassan Jaleel Hassan

Engineering and Technology Journal, 2016, Volume 34, Issue 5, Pages 900-911

The noise is any undesired signal that contaminates an image. This paper proposes an algorithm for color image noise detection of several types of noise, namely; Gaussian, Salt and Pepper and Speckle.
This algorithm uses a method of generating a square matrix from original image, called a Recursive Matrix (RM)
This RM was used successfully in detecting the noisy or noisy-free image. The first step is to analyze the three bands monochrome image (color image) to Red, Green and Blue images, then deal with each image as a grey-scale image which is represented as 2-Dimenssion matrix. The second Step is to construct the RM to each monochrome image, then to calculate the standard deviation (std.) for each RM to distinguish between noisy and pure image by using objective testdepending on Std. threshold. In the third step, the subjective test is used to the same image by plotting the image with its RM in 3-Dimensions, for both pure and noisy images. The proposed algorithm gives a perfect detection of noise in 50 color images as a case study used in this algorithm.

Design and Development Dynamic Functional Models of Radio Systems by Using the MATLAB System

Saad Z. Sekhi

Engineering and Technology Journal, 2016, Volume 34, Issue 2, Pages 322-333

In this study, we have presented brief theoretical information regarding the design of dynamic functional models of radio systems and practical recommendations for their development and investigation in the MATLAB system. The paper mainly concentrates on three points, as follows: 1. Development of a dynamic functional model filters shaping to obtain the Gaussian random processes with given correlation properties using the MATLAB environment. 2. A development study of a dynamic model rectangular pulse detector against the background self-noise.

Speckle Noise Removal for Synthetic Aperture Radar Imagery Based on Statistics Filters and Nonlinearing Function

E kbal H. Ali

Engineering and Technology Journal, 2012, Volume 30, Issue 13, Pages 2252-2264

Synthetic Aperture Radar (SAR) images are contaminated by multiplicative
noise, due to the coherence of the radar wavelength, labeled as speckle noise which
results in an important reduction in the efficiency of target detection and
classification algorithms . In this paper the corrupted pixels are replaced by an
estimated value using the simple filter based statistics filters with nonlinear
function which are worked at the same time to reduce the speckle noise without
blurring edges or other features in SAR imagery. Quantitative and qualitative
comparisons of the results obtained by the proposed method with the results
achieved from the other speckle noise reduction filters demonstrate its higher
performance for speckle reduction with preserving high frequency features (edges)
in SAR images.

Effects of Ethanol-Gasoline Blends on Exhaust and Noise Emissions from 4-Stroke S.I.Engine

Maher A.R. Sadiq; Yassar K. Ali; Aimen Rashad Noor

Engineering and Technology Journal, 2011, Volume 29, Issue 7, Pages 1438-1450

Considering pollution problems and energy crisis today, investigations
have been concentrated on lowering the concentration of toxic components in
combustion products and decreasing fuel consumption by using renewable
alternative fuels. In the present work, the effect of ethanol addition to gasoline on
the exhaust emissions and noise level has been experimentally investigated at
various engine loads.
Results of the engine test indicated that using ethanol-gasoline blended fuels
increases the power output of the engine dramatically (up to 50 %). While the CO
and HC emissions decrease as a result of the leaning effect caused by the ethanol
addition; and the CO2 emission increases because of the improvement of
combustion. Also, it was noted that the noise level emission increases slightly with
the increase of ethanol content. Finally, the results showed that ethanol can be used
as a supplementary fuel to gasoline in modern spark ignition engines without major
changes, and it can help to save our environment from toxic pollutants and to save
a considerable part of the available oil.