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Huge quantities of suspended particles in our atmosphere, cause scenes to appear hazy or foggy, this reduces visibility of objects and their contrast, and makes detection of objects within the scene more difficult. Most existing algorithms are based on a strong, statistically based prior, the dark channel prior. We introduce an improved Dark Channel Prior method for dehazing image. The transmission map is refined by opening (eroding and dilating) it, thus reducing the halo and block effect.Our method recovers the true radiance of distant objects and the problem of bluishness is reduced.On the basis of color information has been made adaptive.The results show that our method is effective in comparison with other methods.

High performance filters in GHz range are required in communication systems. The Group-Type Unidirectional Transducer (GUDT) has an inherent property of having the low l o s s and passband ripple, which is advantageous in the design of filters. SAW filters on 128' rotated Y-cut LiNbO3 have been built at cetner frequencies between 1-3 GHz. The filters are analysed by using the equivalent circuit model including the phase shifter. The fine electrodes of the order of 0.2,um width have been fabricated using electron beam lithography, normal lift-off techniques and 02-plasma cleaning system. The insertion loss and the passband ripples are considerably less than the earlier reported ones. Experimental results of weighted transducer filters are also presented.A new Group-Type of Unidirectional Interdigital Transducer (New GUDT) and a new type of phase shifter employing the inter-layer thin film capacitance of the feeding electrode strips as one of its essential elements are reported in this paper.

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