Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Wavelet Pair Noise Removal for Increasing the Classification Accuracy of a Remotely Sensed Image

  • Jin, Hong-Sung (Applied Mathematics Department, Chonnam National University) ;
  • Yoo, Hee-Young (Earth Science Education Department, Seoul National University) ;
  • Eom, Joo-Young (Earth Science Education Department, Seoul National University) ;
  • Choi, II-Su (Applied Mathematics Department, Chonnam National University) ;
  • Han, Dong-Yeob (Applied Mathematics Department, Chonnam National University)
  • Published : 2009.06.28
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Abstract

The noise removal as a preprocessing was tried with various kinds of wavelet pairs. Wavelet transform for 2D images generally uses the same wavelets as basis functions in horizontal and vertical directions. A method with different wavelets was tried for each direction separately, which gives more precise interpretation of the classification. Total 486 pairs of wavelets from nine basis functions were tried to remove image noises. The classification accuracies before and after the noise removal were compared. Although all kinds of wavelet pairs showed the increased accuracies in classification, there were best and worst wavelet pairs depending on the data sets. Wavelet pairs with low energy percentage of LL band showed the high classification accuracy. A pattern was found in the results that very similar vertical accuracy was distributed for each horizontal ones. Since Haar is the shortest length filter, Haar could be a predictor wavelet to find the good wavelet pairs.

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References

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