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Poster Session 1
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Colour Palette Compression via Vector Quantization
for Colour Image Transmission
3. Experiments
The proposed method is applied to the three band images. The result are shown in figure 2. it is clearly that the proposed technique gives a higher colour quality comparing with the method of colour ration by 3:3:2 of red, green and blue colour. The table of mean square error confirms the results.
Table of mean square error from each band
| Inage Band |
Proposed method |
Colour ratio |
| Red |
7.4425 |
173.3916 |
| Green |
7.9714 |
173.77069 |
| Blue |
7.994 |
276.4466 |
| Average |
7.8029 |
207.8697 |
Figure 2. Colour palette compression via Vector Quantization
Figure 3. Error of proposed method of red green and blue band
Figure 4. Error of RGB type 3:3:2 of red green and blue band
4.Conclusion
For [MxN] pixels of colour image , the proposed method provides only nx[MxN] bits instead of 24x[MxN] bits of original colour image. n is the selected number of binary bit for 2n different code vectors. However, the proposed techniques needs 2nx24 bits for representing the palette of 2n different colour. Therefore, the total number of bits for this proposed method is nx[MxN]+2nx 24 bits.
Acknowledgement
The Authors would like to thank the National Research Council of Thailand providing the satellite images.
Reference:
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N.M.Nasrabadi and R.A.King , " Image coding using vector quantization; A Recview , " IEEE Trans. Commun., Vol . COM-36, pp. 957-971, Aug. 1980
- Y.Linde, A . Buzo , and R.M.Gray, " An algorithm for vector quanitzer design ," IEEE Trans. Commun., vol.COM-28, pp. 84-95, Jan 1980.
- A.Gersho and R.M. Gray, " Vector Quantizaiton and Signal compression ", Kluwer Academic Publishers, Boston , London, 1991.
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