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Proposed is an effective feature for colour image retrieval based on block truncation coding (BTC) and vector quantisation (VQ). Each input colour image is decomposed into Y, Cb and Cr components. BTC is performed on the 4×4 Y blocks, obtaining a mean pair sequence and a bitplane sequence, and then they are quantised with the contrast pattern codebook and visual pattern codebook to obtain the contrast...
The authors present a new recursive algorithm for solving linear algebraic equations Ax=b. With this algorithm, the ith step recursion can find one solution of the first i equations; the unique solution of the total n equations could be found after the nth step recursion. Because of this recursive property, the algorithm can be used not only in solving ill-conditioned equations but also in recursive...
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