International Journal of Engineering Research in Electronics and Communication Engineering(IJERECE)

Monthly Journal for Electronics and Communication Engineering

Volume3,October 2016,

Topic : Contrast Enhancement of Satellite Images Using Dual- Tree Complex Wavelet Transforms Technique

Authors:M.Hemalatha || Dr.S.Varadarajan , A.V.Kiranmai

Abstract:this paper forwards enhancement of satellite picture using Discrete Time Complex Wavelet Transform Technique. The discrete-wavelet-transform-based (DWT) contrast image scheme generates artifacts (due to a DWT shift-variant property). A wavelet-domain approach based on dual-tree complex wavelet transform (DT-CWT) proposed for contrast of the satellite images. A satellite input image is decomposed by DT-CWT (which is nearly shift invariant) to obtain high-frequency subbands. The highfrequency subbands and the low-resolution (LR) input Iím-age are interpolated using the Lanczos interpolator. The highfrequency subbands are passed through an NLM filter to cater for the artifacts generated by DT-CWT (despite of its nearly shift invariance). The filtered high-frequency subbands and the LR input image are combined using inverse DT-CWT to obtain a resolution-enhanced image. The contrast enhancement method uses the analysis of excellent glaze levels and appropriate flexible radiant transfiguration which performs DWT in reducing the rate of image which is given as input, into a group of band bounded constituents by a sampling factor, called High-High, High-Low, Low-High, and Low-Low sub bands. The brightness propaganda is contained in the Low-Low sub-band where the input image with the superlative glaze level is computed. According to the superlative glaze level the Low-Low sub band is disintegrated into trilayer. The suitable flexible radiant transfiguration is processed in the disintegrated trilayer of the sub-band using knee shift function, dominant glaze level and gamma adjustment function. For preserving the texture of contrast suitable enhanced flexible radiant transfiguration is processed. The final enhanced image is acquired by means of the use of inverse DWT. In this method, the distant sensed image is bifurcated into petite blocks, and then each block is improvised using advanced block based discrete wavelet transform. The enhanced blocks are then fused together and by using inverse DWT, the emanated image is obtained. The glaze and radiance of the satellite image will be better when compared with the image used in the Existing systems. Haar Wavelet Transform (HWT) is used for disintegrating the pictures into sub-bands. Trilayer is formed using preeminent glaze level analysis. From the preeminent glaze, each disintegrated layer there is a generation of suitable radiance transfer function..

Keywords: Complex Wavelet Transform, Discrete wavelet transform (DWT), Preeminent glaze level analysis, Flexible radiant transfiguration.

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DOI: 01.1617/vol3iss10pid477


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Editor-in-Chief

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Dr.Zhongfu Tan
National Professor,
North China Electric Power University,
CHINA


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ISSN(Online): 2394-6849

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Thomson Reuters ID : q-6288-2016.
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