Homomorphic filtering textural analysis technique to reduce multiplicative noise in the 11Oba nano-doped liquid crystalline compounds

Abstract

The compound undecyloxy benzoic acid (11Oba) exhibits nematic and smectic-C phases while a nano-doped undecyloxy benzoic acid with ZnO exhibits the same nematic and smectic-C phases with reduced clearing temperature as expected. The doping is done with 0.5% and 1% ZnO molecules. The clearing temperatures are reduced by approximately 4 ° and 6 °, respectively (differential scanning calorimeter data). While collecting the images from a polarizing microscope connected with hot stage and camera, the illumination and reflectance combined multiplicatively and the image quality was reduced to identify the exact phase in the compound. A novel technique of homomorphic filtering is used in this manuscript through which multiplicative noise components of the image are separated linearly in the frequency domain. This technique provides a frequency domain procedure to improve the appearance of an image by gray level range compression and contrast enhancement.

Keywords:

• homomorphic filtering
• polarizing microscope
• nano-doped compound
• illumination
• multiplicative noise
• reflectance

Acknowledgements

The authors would like to express their deep gratitude towards the Department of ECE, K L University, Vaddeswaram, and The Hindu College, Machilipatnam, for their continuous support and encouragement during this work. Dr R.K.N.R. Manepalli (Dr M. Ramakrishna Nanchara Rao) wants to express his gratitude to the UGC for grant 42-784/2013 (SR).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

UGC [grant number 42-784/2013 (SR)].