Matrix Quantizationof Horonoorphically Processed Imtages
Mahesh Viswanathan · 1986
This paper discussesthe design of a tree-searchmatrix quantizerto be used to encode homiomorphically processed im,ages. An image obtained by optical nmeansis modeled as a product of the illumtination and reflectance contponents.The illuminationpart is lowpass and the reflectance part which reveals the edge and texture details, is highpass. The homomiorpphic system as applied to inmage processing consistsof a logarithmtic point transformiation followed by linear filtering. Homomorphicprocessingachieves a sinmultaneous dynamticrange reductionand contrast enhancenment. A matrix quantizer operating on such processed imtagesis shown to achievebit rates as low as 0.16 bpp with acceptable quality.