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Gradient-based block truncation coding

Gradient-based block truncation coding

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A new gradient-based block truncation coding (BTC) algorithm is presented. Combined with a simple two-way classification, the algorithm shows a substantial improvement in the visual image quality demonstrated by edge preservation and reduction of the staircase effect. At the same time, significant reduction in bit rate is achieved. A user-defined threshold allows bit rates in the range 0.70 – 1.5, depending on the quality level desired.

References

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      • N. Nasiopoulos , R.K. Ward , D.J. Morse . Adaptive compression coding. IEEE Trans. , 1245 - 1254
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      • M.D. Lema , O.R. Mitchell . Absolute moment block truncation coding and its applications to colourimages. IEEE Trans. , 1148 - 1157
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      • V.R. Udpikar , J.P. Raina . Modified algorithm for block truncation coding of monochrome images. Electron. Lett. , 901 - 902
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      • E.J. Delp , O.R. Mitchell . Image compression using block truncation coding. IEEE Trans. , 1335 - 1342
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      • J. Kittler , J. Illingworth . Threshold selection based on a simple image statistic. Comput. Graphics Image Process. , 125 - 147
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