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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 01 | Jan-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 754 Image Denoising Analysis over Wireless Networks Hamidreza Yazdizadeh Alborz Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Image denoising is one of the most challenging issue in image processing. It further amplifies when an image send through a wireless network. Many reasons can affectthe image such as rain, fog, snow, sensors. This paper investigate aforesaid effects and the potential solutions are used in order to denoising. Key Words: Wireless, Network, Image, Denoising 1. INTRODUCTION Wireless networks have many applications in order to send the data. The type of networks are different which are included satellite communication, different wireless communication and integrated wireless networks. The integrated wireless networks have a combined architecture. It is a combination of two or more networks which can be different from each other such as WLAN, WiMAX and Adhoc [1]-[4]. Figure 1 shows these types of networks. Fig -1: Integrated wireless The other type of network can be satellite communication which is used for different purposes [5][6]. One of its usage is disaster management [7][8], In this case the data can be interpreted in order to help the people or evaluate the area in which the disaster is happened. The most important data is image which can be used in this process. Figure 2 shows the satellite communication architecture. Fig -2: Satellite network architecture Also, satellite communication can be GPS which is used frequently in communication systems [9] [10]. The data which are sent over these types of networks are different. They can be text, voice, video and image. One of these data is images. When image is sent over the wireless networks, some noise can affect it. These noise caused by channel noise, sensor noise or any other types of noise source. There are some works on image denoising through wireless networks [11] [12]. Therefore, at the receiver side, the degraded noise is obtained. Type of noise is depend on the channel condition. The channel has different effects which creates different random distributions for noise. Also there are some denoising methods in order to restore the image. These methods are based on the type of noise as well as its mathematical distribution [13]. The methodsalso based on the wireless channel condition in which the image is sent. The denoising and the conditions are discussed later in this paper. The bock diagram of the process is shown in figure 3. The input image data goes through a wireless channel and the degraded image is obtained on the other side, then, the image is restored by the different techniques based on aforesaid conditions.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 01 | Jan-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 755 Fig -3: Block diagram 2. CHANNEL 2.1 Natural noise The channel in the wireless networks is the air. When the data is transmitted through the channel, some noise affect the channel. These types of noise are due to air conditions. One of these types of noise is atmospheric noise whichisdue to natural process. The lightening, rain, fog, snow and other natural events can be a reason. They are radio noise and can be observed as a combination of white noise and impulse noise. Also, it is dominant in low frequencies. Figure4shows the atmospheric noise relationship [14]. One of the important data which can be degraded is the image. The image data can be affected due to these types of noise when it is received at the receiver side. In this condition,two common types of noise that may appear in the image are impulse and periodic noise [15]. These types of noise randomly affect the image. Then, the image can be restored properly after acquisition based on the related denoising techniques. 2.2 Transmission error This kind of noise is based on errorswhich appear during the transmission. These errors can be caused by thermal Fig -4: Atmospheric noise relationship noise [16], signal distortion, cross talk [17], companding which is voice amplitude signal compression, interference, PCM(pulse code modulation) [18], jitter whichisvariationin signal timings [19] and synchronization. It can be detected and corrected. There are several techniques for error detection and correction. The image data can be affected due to these types of noise when it is received at the receiver side. In this condition, a common type of noise that may appear in the image is impulse noise. This noise randomly affect the image. Then, the image can be restored properly after acquisition based on related denoising techniques. This is an important problem in ICT [20] issues. 3. SENSOR Camera sensor is one of major problem which is produced many types of noise. It causes random variation of color in the image. The common type of that is a charged couple device (CCD) [21] and complementary metal oxide semiconductor (CMOS) [22]. The newer one is Foveon X3 sensor which is based on CMOS technology. All of them are based on RF technology [23]. The image data can be affected due to these noise when it is received at the receiver side. In this condition, many common types of noise that may appear in the image are 1) impulse noise [15] 2) Gaussian noise [24] which is additiveand independent and the amplifierisamajorsource of that. At higher frequency, it changesto shot noise whichis not independent. Shot noise [15] can be defined as a variation in the number of photons which are sensed at a given exposure level. It has Poisson distributionandalso,can appear asdark shot noise [25] in which additionalshotnoise from the dark leakage in the sensor is produced 3) quantization noise [26] [27] which caused by quantizing the pixels of an image to a number of discrete levels. Its distribution is normal. It is independent, if other noise
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 01 | Jan-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 756 sources are big enough. 4) Film grain noise [28] which is dependent and has distribution similar to shot noise. Also, it is called isotropic (non-oriented) source. 5) Anisotropic noise [28] which has significant orientation in the image. These noise randomly affect the image. Then, the image can be restored properly after acquisition based on related denoising techniques. 4. DENOISING In the denoising block, the image will be denoised based on various denoising methods. It should be done in the receiver side after receiving the data. All noise types have their own denoising process. Impulse noise which appearsasblackand white pixels [30] [31]. Gaussian noise appears as Gaussian distribution in the image histogram [32]. Shot noise which appearsas Poisson distribution intheimage histogram.Also, other types of noise have their own distribution and consequently their own denoising method. There are some algorithmswhich isused aspreprocessingin order to denoising through wireless networks. These algorithms areincludedDual-treecomplexwavelettransform (DT-CWT) in wirelessmultimedia sensor networks(WMSN) [11]. It is based on wavelet coefficient estimation and apply an optimal hard threshold function using MAD strategy. It claimsthat has better performance than 2D-DWT toenhance the WMSN images. Another denoising is clustering-based sparse denoising in wireless multimedia sensor networks (WMSN)[33] [34]. In this algorithm,the WMSN imagesare clustered and based on pixel intensity of regions of interest (Bayesian), then, non- local self similarityis used and a new sparse denoisingmodel is created by clustering based sparse representation. It uses both non-local self similarity and sparsity. Finally, inorderto solve the l1 norm optimization problem, a surrogate shrinkage function is used iteratively. This paper suggests a denoising block as a post-processing method. After the image receives by the receiver, a post- processing is applied on theimage and the denoised imageis obtained. This can be done by regular denoising methods based on the type of noise. Also, it is possible to add extra steps in order to improve the restored image, for example, multiple denoising steps. 5. CONCLUSIONS This paper reviewed the previous processes and showed a new procedure for the image denoising through wireless networks. It exploited several blocks including: input data block, a wireless channel, denoising block as a post- processing, an output data block. These blocks have their own process and methods. Then a new procedure proposed asdenoising with regard to wirelesschannel condition.Also, its flexible nature can be improved in the future to add and improve extra blocks. 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