Progressive transmission and reconstruction of coded images allows an approximate image to be reconstructed based upon partially received information and adds details as additional information becomes available. This technique has various potential applications in the area of image communications, such as interactive picture retrieving, variablerate video conferencing, and quick display for freeze-frame image transmission. An optimal progressive transmission and reconstruction scheme is proposed for transformed images. The proposed scheme is embedded coding via bitsliced bit assignment. The bit-sliced progressive scheme requires the quantizer to be embedded. A threshold-aligned nonuniform quantizer is designed for this particular application. Simulation results show that the bit-sliced progressive scheme is at least twice as efficient as the zigzag scanned scheme.
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