Histogram equalisation technique to analyse induced cholesteric phase in nanodoped liquid crystalline compound

Abstract

The 1% Fe₃O₄ nanodoped in dodecyloxy benzoic acid induces cholesteric phase quenching the nematic phase that the pure compound exhibits. Further, the solid–solid transition also occurs when compared to the pure compound and the transition temperatures are reduced along with the cholesteric thermal ranges of LC phases. The histogram is the operation by which the occurrences of intensity value in the image is shown. Further, histogram equalisation is the technique through which the dynamic range of the histogram of an image can be increased. Histogram equalisation method is used in this article to analyse the 12Oba + 1% Fe₃O₄ nanodoped liquid crystalline textures by considering global and local image information and for the adjustment of image intensities to enhance the contrast. The basic idea of histogram equalisation is to remap the grey levels of the image, and this method is used to identify the uniform regions and detect the defects that are not clearly observed from the textures that are recorded by polarising microscope.

Keywords:

• histogram equalisation; image processing
• nanodoped LCs
• contrast
• image enhancement

Acknowledgements

The authors like to express their deep gratitude towards the department of ECE, K L University, Vaddeswaram, The Hindu College, Machilipatnam, for their continuous support and encouragement during this work.

ORCID

V.G.K.M. Pisipati http://orcid.org/0000-0003-2382-4400

B.T.P. Madhav http://orcid.org/0000-0002-6893-6978

Additional information

Funding

Dr RKNR Manepalli (Dr M. Ramakrishna Nanchara Rao) wants to show his gratitude to UGC through grant 42-784/2013 (SR).