Abstract
AbstractWhen a telewriting signal of handwritten text and graphics shares a common telephone channel with voice, the data rate of the telewriting must be curtailed to maintain the quality of the audio portion. A fixed rate sampling method with linear interpolation has been used in telewriting because of its simplicity. However, this method does not perform well when distortions are caused by higher drawing speed of line strokes. To overcome such a shortcoming, this paper: (1) investigates the distortions associated with the fixed rate sampling method; (2) derives quantitative measures of interpolation distortion and truncation distortion; and (3) proposes an adaptive sampling algorithm. A writing tablet (4 dots/mm resolution) was used in the experiments to validate the objective measures, and to assess the performance of the adaptive algorithm. Experimental results indicate that while the data rates of the fixed rate sampling method and the adaptive method are almost the same, the adaptive method scores higher in the subjective image quality assessment tests.
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