Knowledgebase, Subpixel and Object-based classification methods you can explore but more than methods, results matter.

There is also semi-supervised classification.

Hello Abhilasha, at present date there has been a number of classification techniques in the literature. The following review is a good summarisation:

http://www.tandfonline.com/doi/abs/10.1080/01431160600746456#.UxHCP-OSyCU

If you are open for object-based image analysis, various segmentation methods can be also proposed.

Image segmentation and Object Oriented Image Analysis in Matlab or E-cognition, Knowlege classifier in ERDAS, Decision tree Classifier in ENVI, Linear Spectral unmixing or Mixture tuned map filtering(MTMF) and ANN etc. But depend upon results you want.

i here from my supervisor there is a technique called subpixel classification . it is better than others