Patent ID: 6295322
Filing Date: 2001-09-25
Classification: G06T,G09G,H04N

Abstract:
Image processing apparatus for extending the frequency bandwidth of an original video image that is spatially-sampled at a first sampling frequency and is represented by an input data stream comprising successive pixel values that define said frequency bandwidth; said apparatus comprising:first means for deriving, from said pixel values of said input data stream, (1) a first data stream that comprises successive pixel values of a first image component that has substantially the same frequency bandwidth as said original video image and is spatially sampled at a second sampling frequency which is sufficiently higher than the highest frequency component of said frequency bandwidth of said original video image to result in said first image component being significantly oversampled, and (2) a second data stream that comprises synthetically-derived successive correction-waveform pixel values of a second image component that is spatially-sampled at said second sampling frequency, said synthetically-derived successive correction-waveform pixel values defining spatial frequencies of said second image component that are higher in frequency than said highest frequency component of said original video image; andsecond means for summing the corresponding pixel values of said first and second data streams to thereby derive a third data stream of successive pixel values that define the frequency-extended bandwidth of an output video image from said second means with respect to said frequency bandwidth of said original video image.