Abstract
Recently, Sikora proposed a Hybrid block/object coding scheme, which is many times faster than existing segmented image coding techniques, and which is based on the shape-adaptive discrete cosine transform (SADCT). This paper shows that the rate distortion characteristics of this method can be significantly improved by replacing the SADCT with a weakly-separable (WS) polynomial transform, at the expense of some extra computations. The paper introduces different versions of these WS transforms and shows that the best one typically requires a 10% lower bit rate than the SADCT on non-square regions. It also points out a few theoretical disadvantages of the SADCT.
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