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Compression of colour image data using histogram analysis and clustering techniques

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2 Author(s)
McColl, R.W. ; Warwick Univ., Coventry, UK ; Martin, G.R.

Digitised colour images quantised at 24 bits per pel represent a considerable storage requirement. For many applications a coarser quantisation is allowable or even necessary. The authors describe three variations on a method to quantise RGB data at approximately 4 bits per pel. The main criterion in the scheme is that of a minimum perceptual distortion in the reproduced data. The MacAdam chromaticity domain is used as a perceptually metric space in which equal Euclidean distances may be assumed to represent equally perceived colour differences. Histogram and cluster analysis methods are used to quantise the RGB data at 4 bits luminance and 0.75 bits chromaticity. The results appear acceptably close to the originals

Published in:

Electronics & Communication Engineering Journal  (Volume:1 ,  Issue: 2 )