Mahalakshmi Venkataraman

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We present a fast, non-iterative technique for producing grayscale images from error di used and dithered halftones. The rst stage of the algorithm consists of a Gaussian lter and a median lter, while the second stage consists of a bandpass lter, a thresholding operation, and a median lter. The second stage enhances the rendering of edges in the inverse(More)
We present a new transform which, when applied to the denominator polynomial of the transfer function of an unstable multidimensional recursive digital filter (of a special class) will yield a stable polynomial with good preservation of the magnitude spectrum. In fact, the discrete Hilbert transform (DHT), used to stabilize 2-D and 1-D recursive digital(More)
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