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Fusion of Images using DWT and fDCT Methods
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 489 Fusion of images using DWT and fDCT methods 1Shivanand R. Kollannavar 1PG student, M.tech in Digital Electronics, Department of E&CE, SDM college of Engineering and Technology,Dharwad, ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Image fusion methods has played an important role in the development of extracting inherent image information. The applications of image fusion are considered in fields pertaining to medical imaging, military applications, commercial applications and satellite imagery. This necessitates the development of more robust and effective image fusion techniques. However, when it comes to practicality of these techniques such as noise considerations (AWGN based channel noise, etc.), many these methods suffer limitations. In this paper, two stages are considered, the first stage consists of pre-processing where the Gaussian noise is considered along with the removal of noise using median based filtering approach. The second stage consists of image fusion using DWT and fDCT based methods. A comparative analysis is performed of the two methods. Image quality assessment concerning measures such as PSNR, SNR, SSIM, MAE, Gradient and standard deviation were performed. Itwas observed that the fDCT based image fusion methodperformed with comparatively higher measures than the DWT given the similar initial conditions. Experimental results show that the coefficients considering the scale and orientation of fDCT provides a higher accuracy than compared to coefficients obtained from DWT method. Key Words: Gamma correction, DWT, fDCT, Median Filtering, Gaussian noise,static filtering, fDCTwrapping. 1. INTRODUCTION Image fusion plays a significant role in many of pre-sent’s day’s applications ranging from military applica-tions, healthcare industries, satellite imagery and wireless systems. The requirement of effectiveandrobusttechniques for the process of fusion of image is more than necessary in present day’s scenario. Some of the applications in medical image fusion include detection and diagnosis of modular related disorders and conditions. In military applications, image fusion helps in identifying enemy intrusion through advanced surveillance system. However, a major limitation observed in the process of image fusion is that of practicality in real time applications. In the context of wireless systems, the data undergoes transmission stage, channel and receiver stages where it encounters many types of noise and its effects. For example, in the transmission stage, during the sampling and quantization, the image is affected by what is known as aliasing and quantization noise which is caused due to sampling errors. When it sent for the encoding process, the image is affected by certain noise. When the data is transmitted through a channel, the image is affected what is known as Additive White Gaussian Noise (AWGN) which alters the characteristics of the image significantly. Another major limitation is that of the illuminationiscaused due to short dynamic range that results from the type of image acquisition device. Many methods for im-age enhancement considering the spatial domain is pro-posed, however, in the context of image fusion, the scope of image enhancement remains to be dealt with. Image fusion methods considering the noise factor and the illumination conditions are limited which otherwise has a greater scope of applications and significance. Methods of image fusion mainly involve temporal based methods which applies imaging techniques on a time se-ries domain. The implication of transformation function such as Discrete Wavelet Transformation (DWT), Curve let transformation, etc are yet to be explored in the context of image fusion. It is observed that, though there are many methods which are available in the context of image fusion, the practicality associated with these techniques are very li-mited. Hence in the proposed work, image fusion tech-niques are implemented considering the aspects of image illumination and noise factors of the image. A comparative analysis is performed based on the two methods proposed in the previous section. The paper is structured as follows; the first section deals with the introduction which signifiestheimportanceandthe limitations pertaining to image fusion methods. The second section deals with the literature survey, the third section deals with the proposed system and implementation. The fourth section deals with the results and discussions followed by conclusion. 1.1 LITERUTURE SURVEY Image fusion is a process of combining relevant informa- tion of images into single image information in view to enhance the image quality assessment. Deepak Kumar et. al [1] proposes a generalized techniques that are involved in image fusion process. Some of the methodsmentionedinthis paper are averaging method, principal component analysis
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 490 and discretewavelet transformation(DWT) to name afew.A comparative analysis is also performed re-garding the significance and limitations of each method in view of the image quality. Y. Zhang et. al [2] performed a study inunderstandingthe process of image fusion along with its significance and limitations. Among the various image fusion techniques, the significant techniques involve HIS (Intensity, Hue and Saturation) based image fusion, PCA (Principal Component Analysis) based image fusion arithmetic combinations and wavelet fusion. Major limitations in these methods involved variations in parameters concerning spherical distribution, band combination and colour distortion problems. Hence, there is a requirement to enhancement the quality of the image. Harry NGross et. al [3] proposed an applicationinvolving the improvement of image enhancement by considering a spectral mixture analysis and image fusion techniques. The spectral mixture analysis is performed to obtain higher spatialaccuracy which is implementedthroughconventional unmixing to generate fraction images. Further fusion methodsareimplementedtocombinethespectralandspatial images to form a single image which provides more information to the user. Methods of evaluation for to assess the performance of image fusion techniques was proposed by Alparone et. al [4] concerning the multispectral high resolution pan chromatic images, The radiometric anddistortionmeasurementswhich are observed in the pan images are encapsulated in a specific measurement whichaccounts for factors such as variationin contrast, mean bias and spectral distortion. Comparitive analysis is performed among different image fusionmethods using this quality assessment metrics. M. Gonzalez et. al [5] proposed a new method involving fusion of multispectral and panchromatic images using IHS and PCA based methods which is performed on a wavelet based decomposition technique. The image is first decomposed using the wavelet transformation to extract the detail coefficients which is then processed usingIHSandPCA methods which consecutively merges both spectral and spatial aspects of the image leading to higher resolution of the image. Experimental results showed that when using undecimated algorithm is used in wavelet transformation, improved performance in the methods was observed. Myungjin Choi [6] proposed a new method involving IHS based image fusion, the significance of this method was to fuse massive amount of images which are obtained from the satelliteimages, further a trade-off is performedbetweenthe spectral and spatial aspects of the image to improve the image qualityassessments. The significanceofthisapproach is easy and fast implementation of the image fusion process. C. Pohl and J. L Van Genderen [7]performedanevaluation on the different methods involving image fusion along with its possible applications. The methods of image fusion in this works mainly involve pixel based image fusion. The geometric correction of the image data concernsfactorssuch as geometric model, groundcontrol points,digitalevaluation model and resampling methods. The objectives of image fusion involves sharpening of images, improving the geometric corrections and enhancing featuresnotvisibleina single data alone. Another aspect observed in thisworkisthe significance of band selection and its role in the image fusion process. Yoonsuk Choi and Shahram Latifi [8] performed a review on the different image fusion techniquesforsatelliteim-ages. The main focus of the work is the reviewing of the background of the transformation theory, analysis of standard colours and contour-let based schemes, hybrid schemesandwavelettransformationbasedschemes.Ofthese methods, the wavelet transformation based image fusion produced improved results in context of standardizationand minimization of colour distortion. This inturn has better performance as compared to IHS and PCA based methods. This is further signified in the following work. Krista Amolins et. al [9] performed astudyofapplications of image fusion considering the wavelet based transformations. It was observed that the standard image fusion methods such as IHS and PCA based methods that though the spatial information is improved in the image information, the colour distortion was produced which significantly deteriorates the quality of the image data. Various methods of wavelet based transformation was applied for image fusion process and it was observed that even the simplest of wavelet based image fusion produced improved quality of performance in the context of image quality assessment as compared to the standard methods of fusion techniques such as IHS and PCA. This is especially prevalent in panchromatic satellite imagery. Myungjin Choi et. al [10] emphasied the use of curvelet transformation forimage fusion. A comparativeanalysiswas compared to other standard methods such as IHS, PCA and wavelet based methods. The main objective of image fusion was to obtain good details of the spectral and spatial information of the image data. However, the DWT method produced better accuracy in the context of spatial information by representing the edges. The proposed curvelet transformation resulted in better accuracy in terms of representing the edges in the image which further improved the accuracy of the image spatial information. Filippo Nencini et. al [11] proposed an image fusion me- thod using curvelet based transformation considering the panchromatic images. First, the directional detail edge coefficients were derived which further soft thresholded to reduce the noise. It was observed that the noise reduction
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 491 was better when compared to Discrete Wavelet Transformation (DWT). Experimental results showed an improved result in image quality such as image sharpening and reduction in local inaccuracies. 1.2 PROPOSED SYSTEM The proposed system is basically divided into three modules involving pre-processing, image fusion using Discrete Wavelet Transformation and image fusion using Discrete Curvelet Transformation. The pre-processingstage consists of addition of noise and noise removal me-thod.The fusion method concerning the DWT considers the image fusion method based on the haarwaveletandthedaubechies basis function, and finally the curvelet based method considers the wrapping and usage of 2nd order static filter for fusion of image. Gamma correction Gaussian Noise Median filtering Image 1 Image 2 Select region to blur image Image 1 Image 2 Select basis function Select level of decomposition AC DC Perform mean based image fusion Perform fDCT wrapping Set scale and orientation Perform 2nd order static filtering Select level of decomposition Perform inverse fDCT wrapping Image Pre-processing Discrete Wavelet Transform Discrete Curvelet Transform Fused image Fused image Fig 1: block diagram of proposed System Architecture The functionalities mentioned above will have an in depth analysis with respect to its working. This is given as follows. a. Pre-processing As mentioned in the previous section, the pre-processing stage consists of two stages involving image enhancement and noise removal process. The image enhancement is performed using gamma correction method which is based on spatial based image enhancement having an adjusting parameter of gamma factor that depends on the image considered. The gamma correction method is given as follows, (1) Where, I (x, y) input image, T(x, y) transformed image The gamma correction method considering thetransformed image is given as, (2) Where, gamma factor Once, the image is enhanced, it is further processed considering the noise removal process, the noiseconsidered in this context is the Gaussian noise, which reflects the channel noise (AdditivewhiteGaussianNoise:AWGN)thatis prevalent in the wireless communication system. The characteristic observed in the Gaussian noise is an implicit random distribution of high intensity values (1’s and 0’s) which makes distorts the respective histogram of the image. The Gaussian noise distribution considered is given in eq. X as follows, (3) Where, z gray level of the image Mean value Standard deviation The filtering method consideredinthiscontextisthemedian filter (also known as the averaging filter). Thesignificance of median filtering is its ability to preserve the edges in an image while maintaining minimum system and computational complexity. The median filter calculates the median which is obtained from the defined pattern from the adjacent pixels in numerical order, consequently the computed median value is replaced with the middle pixel value. The size of mask considered in this filter is of order 3 X 3 which is given as follows, b. Discrete Wavelet Decomposition In the decomposition stage, a preferable technique used in decomposition stage is the Discrete Wavelet Transformation (DWT), the selection criteria for DWT was based on its computational efficiency, practicality and simplicity. The pre-processed image data is further multiplied with the basis function considering the ‘haar’ and the ‘db4’. This results in two types coefficients mainly derived from low pass filter and the high pass filter known as Approximation Coefficients (AC) and the Detail Coefficients (DC) respectively. The decomposition is performed up to 3 level, however, this parameter could be adjusted considering the nature of image. The image fusion method consideredinthis context is the mean based image fusion. In this method, the mean of AC components of two images is performed, along with computing the mean of DC components of two images,
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 492 upon reconstruction of the image (considering the updated AC and DC components) using the inverse DWT, the fused image is obtained. c. Fast Discrete Curvelet Transformation (fDCT) The pre-processed image is first transformed into real valued curvelet components, the probabilities for the curvelet at the finest level is type wavelet. The number of scales considering the coarsest wavelet level is givenin eq. X as shown below, The number of angles st the 2nd coarsest level considering a minimum of 8 must be a multiple of 4. The obtained curvelet coefficients consists of two types mainly ‘sine’ and ‘cosine’ components in the case of real valued curvelet components which is present in the first two quadrants and the last two quadrants respectively. The scaling is performed on the integer varying from finest to coarsest scale, and the orientation (angle) varies from top-lestcornerandincreases clockwise. At level 3 decomposition the scaled and oriented curvelet components are sent to the 2nd order static filtering which controls the way the matrix boundaries are added, This method is considered equivalent to the structuring element used in the morphological operations. The number of 1’s (considering the pixel intensities) in the imageisconsidered for which zeros and ones are padded consideringsymmetry. Finally an inverse fDCT wrapping is performed to reconstruct the fused image using the curvelet components post filtering process. 2. RESULTS AND DISCUSSIONS This section deals with the obtained simulation results along with its description and significance with respect to the project. The parametric evaluations along withitsdescription are also mentioned in this section. The pre-processing stage in the proposed system consists of image enhancement using gamma correction and noise removal process using the median based filtering method. The pre-processed image is measured by two measures namely Peak Signal to noise Ratio (PSNR)andSignaltoNoise Ratio (SNR). Peak signal to noise ratio (PSNR): Peak signal-to-noise ratio, often abbreviated PSNR, is an engineering termfor the ratio between the maximum possible power of a signal and the power of corrupting noise that affects the fidelity of its representation. Because many signals have a very wide dynamic range, PSNR is usually expressed in terms of the logarithmic decibel scale. Signal to Noise Ratio (SNR): Signal-to-noise ratio is defined as the ratio of the power ofa signal (meaningful information) and the power of background noise (unwanted signal) Where, P is average power. Both signal and noise power must be measured at the same and within the same system bandwidth. Structural Similarity Index (SSIM) The structural similarity (SSIM) index is a method for predicting the perceived quality of digital television and cinematic pictures, as well as other kinds of digital images and videos. SSIM is used for measuring the similarity between two images. The SSIM index is a full reference metric; in other words, the measurement or prediction of image quality is based on an initial uncompressed or distortion-free image as reference. Where, average of x Average of y Variance of x Variance of y Covariance of x and y , stabilization of division with weak denominator Mean Absolute Error (MAE): It is defined as the measure of two continuous variables which is given as follows, It is also measured as the average vertical and horizontal distance between each point Y-X. Measures of analysis for image fusion method, 1. Standard deviation: The standard deviation is used to measure the amount of variation which gives an estimate of the range of values that is prevalent in the image data. Italso gives an estimate of the validity of the population which is used to derive statistical conclusions. The overall observations for the images consideredaregiven in the following table X as shown below for controlling parameter as given in table 1
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 493 Table -1: controlling parameter sl.no parameter value 1. Gamma factor 0.71 2. Noise scaling 2 3. compression scaling 0.62 4. image size 245 X 428 Table 2: Observations for DWT based image fusion sl.no Image PSNR SNR SSIM MAE Std. Dev. 1. Image_1 30.33 25.40 1.4 0.95 58.12 2. Image_2 27.20 17.92 7.3 0.86 63.15 3. Image_3 35.85 31.35 0.46 0.989 46.10 4. Image_4 30.56 24.14 2.95 0.899 65.82 5. Image_5 34.84 28.94 0.65 0.98 48.56 6. Image_6 36.24 32.20 0.518 0.98 51.45 7. Image_7 36.30 31.76 0.53 0.98 73.53 8. Image_8 37.8 32.28 0.294 0.992 65.82 9. Image_9 34.06 29.17 0.782 0.97 54.48 10. Image_10 36.25 32.78 0.429 0.990 67.80 Table 3: observations for fDCT based image fusion sl.no Image PSNR SNR SSIM MAE Std. Dev. 1. Image_1 32.66 27.68 1.25 0.97 58.15 2. Image_2 25.63 16.35 7.9 0.83 63.15 3. Image_3 37.25 32.74 0.368 0.993 43.03 4. Image_4 25.91 19.49 4.925 0.754 63.17 5. Image_5 36.05 30.15 0.56 0.98 47.92 6. Image_6 37.30 33.27 0.32 0.99 51.42 7. Image_7 39.05 34.50 0.24 0.99 73.53 8. Image_8 39.71 34.17 0.226 0.994 63.17 9. Image_9 36.90 32.01 0.474 0.99 54.45 10. Image_10 35.10 31.63 0.380 0.991 66.80 3. CONCLUSIONS The overall proposed method for image fusion method involves mainly pre-processing,imagefusionusingDWT and fDCT methods and a comparative analysis of the two methods. Image quality assessment concerning measures such as PSNR, SNR, SSIM, MAE, Gradient and standard deviation were performed. It was observed that the fDCT based image fusion method performed with comparatively higher measures than the DWT given the similar initial conditions. Therefore, the inference can be made that the coefficients considering the scale and orientation of from fDCT provides a higher accuracy than compared to coefficients obtained from DWT method. In future works, more image fusion techniques could be considered for a varietyofapplicationsrangingfrommedical diagnostics to satelliteimagery.Practicalityofthetechniques could be tested on real time imaging data to test the feasibility, performance and robustness of the image fusion techniques, finally different methods of obtaining the coefficients for image fusion could be identified which leads to more effective methods of image fusion given for a particular type of image. ACKNOWLEDGEMENT I am highly obliged to Department of Electronics and communication Engineering, SDM College of Engineer-ing and Technology. REFERENCES [1]Sahu, Deepak Kumar, and M. P. Parsai. "Different image fusion techniques–a critical review." International Journal of Modern Engineering Research (IJMER) 2.5 (2012): 4298- 4301. [2]Zhang, Yun. "Understanding image fusion." Photogrammetric engineering and remote sensing 70.6 (2004): 657-661. [3]Gross, Harry N., and John R. Schott. "Application of spectral mixture analysis and image fusion techniques for image sharpening." Remote Sensing of Environment 63.2 (1998): 85-94. [4]Alparone, Luciano, et al. "A global qualitymeasurementof pan-sharpened multispectral imagery."IEEEGeoscience and Remote Sensing Letters 1.4 (2004): 313-317. [5]González-Audícana, María, et al. "Fusion of multispectral and panchromatic images using improved IHS and PCA mergers based on wavelet decomposition." IEEE Transactions on Geoscience and Remote sensing 42.6 (2004): 1291-1299. [6]Choi, Myungjin. "A new intensity-hue-saturation fusion approach to image fusion with a tradeoff parameter." IEEE Transactions on Geoscience and Remote sensing 44.6 (2006): 1672-1682. [7]Pohl, Cle, and John L. Van Genderen. "Review article multisensor image fusion in remote sensing: concepts, methods and applications." International journal of remote sensing 19.5 (1998): 823-854. [8]Choi,Yoonsuk,andShahramLatifiErshadSharifahmadian. "Quality assessment of image fusion methods in transform domain." International Journal on Information Theory(IJIT) 3.1 (2014). [9]Amolins, Krista, Yuns. Zhang, and Peter Dare. "Applications of wavelet transforms in image fusion." Urban Remote Sensing Joint Event, 2007. IEEE, 2007. [10]Choi, Myungjin, Rae Young Kim, and Moon-Gyu Kim. "The curvelet transform for image fusion." International Society for Photogrammetry and Remote Sensing, ISPRS 2004 35 (2004): 59-64. [11]Nencini, Filippo, et al. "Remote sensing image fusion using the curvelet transform." Information Fusion 8.2 (2007): 143-156.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 494 BIOGRAPHIES Mr.SHIVANAND R. KOLLANNAVAR Graduated from Basaveshwar Engineering College Bagalkot, Karnataka, India in B.E (Instrumentaion Technology) in the year of 2015. He’s currently pursuing his master of technology in electronics and communication from SDMCET, Dharwad, Karanataka, India in 2016- 2017. And his specialization filed is digital electronics. And during his course in the masters he has done his internship in V V Technologies Tumakur.
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