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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 02 | Feb-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 131 COMPARISON ON AVERAGE, MEDIAN AND WIENER FILTER USING LUNG IMAGES Mukesh Chandra Arya 1, Ashish Semwal2 Mukesh Chandra Arya & Ashish Semwal ,Ex M.tech Scholar G.B.P.E.C,Pauri Garhwal,Uttarakhand,India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Image is a prone which have a variety of noise is Digital images. i.e. Poisson noise , Gaussian noise. To get a significant results, Filters like Median filters , Averaging filters, Weiner filter have been proposed to remove noise from Lung Images .This Paper deals with comparison of various filters for noise removing by accounting Peak Signal to Noise Ratio, Mean Square Error and Root Mean Square Error as performance parameters. This Paper proves that wiener filter is best filter for removing noise from the lung images. Results of this paper have been simulated on MATLAB. Key Words: Image Denoising, MSE , PSNR , RMSE, Lung Image. 1.INTRODUCTION Image denoising is an important & significant image processing task for both as a process itself and as a component in other processes. The main properties of a good image denoising model is that it will remove noise while preserving edges.[4]. A very many ways to denoise an image or a set of data exists.Traditionally,linearmodelshave been used. One common approach s to equivalently solving the heat-equation with the noisy image or use a Gaussian filter as input-data, i.e. a linear, 2nd order PDE-model. One big advantage of linear noise removal models is the speed.For some purposes this kind of denoising is adequate. But a backdraw of the linear models is that they are not able to preserve edges in a good manner. Denoisingofimageisan essential part of reconstruction an image process.Noisegets introduced during transmission, acquisition &receptionand storage & retrieval processes. Noise may be classified as substitutive noise (impulsive noiselikepepperandsaltnoise etc), additive noise like Gaussian noise and multiplicative noise like speckle noise[1]. The property of an denoising model of image , it should absolutely eliminate noise with preserving edges. Basically the image qualityismeasured by the peak signal to noise ratio (PSNR) and root mean square error (RMSE).In this paper use the real data form the hospital. all lung images are taken by the hospital. 2. IMAGE DENOISING The principle approach of denoising of image is filtering. To remove noise used filters are- 2.1 Median filters 2.2 Average filters 2.3 Wiener filters. 2.1. Median filters The median filter is non-linear filter. It remove noise effectively as well as preserving sharp edges.[3] A convolution filter is less effective than median filtyer. When the goal is to simultaneously reduce noise and preserve noise. It simply replaces each pixel value by the median of the intensity level in the neighborhood of the pixel. It proves to be best in removing salt and pepper noise . Instead of taking the mean ,rank of pixel values in the window use order statistics filter, take the nth order value 2.2. Average Filter Average filter or mean filter is simple and easy to understand.it perform images smoothing (i.e sinking variation of intensity between one pixel and next)[3]. Average filter replaces each pixel by the average of pixel in a square window surroundingthesepixels.,largerwindow can noise removimg more effectively, but also blur image 2.3. Wiener Filter Wiener filter is a linear filter. It provides linear estimation of a desired signal sequence fromanotherrelatedsequence[3]. Wiener filter provide solution in finding signal estimation troubles for stationary signals. It provides successful results in removing noise from images .Wiener filter is based on statistical approach 3. PERFORMANCE PARAMETER The performance parameters are most important criteria to justify the simulation results. Peak signal to noise ratio (PSNR) and mean square error (MSE) are considered parameters[6]. Where MSE is the mean square error between original and denoised image with M*N size and R is maximum value of pixel present in an image. The quality of denoised image is measured by
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 02 | Feb-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 132 Where , x( i , j) is original image and y(i , j ) is denoised image . RMSE is defined as : RMSE =sqrt(MSE) 4. RESULTS TABLE 1- The following table shows the value of PSNR,RMSE,MSE Of Lung Images Using AVERAGE Filter. IMAGE NAME PSNR RMSE MSE IMAGE 1 37.42 3.45 11.87 IMAGE 2 37.59 3.38 11.42 IMAGE 3 36.96 3.63 13.20 IMAGE 4 36.45 3.85 14.86 IMAGE 5 36.32 3.91 15.28 IMAGE 6 34.60 4.77 22.72 TABLE 2- The following table shows the value of PSNR,RMSE,MSE Of Lung Images Using Median Filter. IMAGE NAME PSNR RMSE MSE IMAGE 1 42.31 1.96 3.85 IMAGE 2 40.75 2.35 5.51 IMAGE 3 41.39 2.18 4.76 IMAGE 4 39.12 2.83 8.03 IMAGE 5 40.55 2.40 5.77 IMAGE 6 37.40 3.45 11.92 TABLE 3 The following table shows the value of PSNR,RMSE,MSE Of Lung Images Using Wiener Filter. IMAGE NAME PSNR RMSE MSE IMAGE 1 42.97 1.82 3.31 IMAGE 2 41.68 2.11 4.45 IMAGE 3 42.47 1.93 3.71 IMAGE 4 40.73 2.35 5.53 IMAGE 5 41.65 2.12 4.48 IMAGE 6 38.32 3.11 9.65 The following lung images are using in this paper- Fig 1: Image Fig 2: Image
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 02 | Feb-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 133 Fig 3. Image Fig 4: Image Fig 5: Image Fig 6:Image 3. CONCLUSION In this paper, Above the results are show the best performance of the wiener filter. Wiener filter are the best filter to use the removing noise in comparison to Average and median filter. Wiener filter performs better in removing noise than other filters. Median filter also provide better results for removing noise. PSNR MSE, and RMSE has been used as comparison parameters. Results have been simulated on MATLAB . REFERENCES [1] R.C. Gonzalez and R.E.Woods“DigitalImage Processing.” [2]C.Saravanan, R. Ponalagusamy”GaussianNoiseEstimationTechniquefor Gray Scale Images Using MeanValue”.Journal of Theoretical and Applied Information technology. 2005-2007 [3] Suresh Kumar, Papendra Kumar, ManojGupta,AshokKumarNagawat, “Performance Comparison of Median and Wiener Filter in Image De- noising”, International Journal of Computer Application, Vol.12 – No.4, November 2010. [4] Shi Zhong, Vladimir Cherkassky, “ Image De-noising using Wavelet Thresholding and Model Selection ”, IEEE, Proceedings 2000 [5] Raymond H. Chan, Chung-Wa Ho, Mila Nikolova, “Saltandpepper noise removal by median-type noise detectors and detail preserving regularization”. [6] Charles Boncelet, “Image Noise Models” in Alan C.Bovik, Handbook of Image and Video Processing, 2005. [7] B. Zhang and J. P. Allebach, “Adaptive bilateral filter fo sharpness enhancement and noiseremoval,” IEEE Trans. Image Process., vol. 17no. 5, pp. 664–678, May 2008. [8] L. Yucheng and L. Yubin, "An algorithm of image segmentation based on fuzzy mathematical morphology," in International Forum on Information Technology and Applications, IFITA'09, pp. 517-520, 2009. [9] W. Haider, M. Sharif, and M. Raza, "Achieving accuracy in early stage tumor identification systems based on image segmentation and 3D structure analysis," Computer Engineering and Intelligent Systems, vol. 2, pp. 96-102, 2011.
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