Television – Bandwidth reduction system – Data rate reduction
Patent
1997-03-21
1999-08-10
Lee, Richard
Television
Bandwidth reduction system
Data rate reduction
348420, 348699, H04N 732
Patent
active
059366729
ABSTRACT:
A half pixel motion estimator, wherein a first search window having a constant size is formed with pixels stored in a previous buffer, and a first motion estimation is performed on the first window generating an integer vector and absolute errors, and a second search window having a constant size is formed by centering candidate blocks determined by an integer pixel motion vector, a second motion vector is outputted by comparing pixels of a reference block having a constant size to half pixels generated by interpolating the integer pixels in the second search window. The half pixel motion estimator comprises an interpolator, which performs an operation for couples of pixels inputted at a previous clock and couples of pixels inputted at a current clock to generate half pixels, in which the pixel couples in horizontal direction on the second search window are sequentially inputted in vertical direction; and a half pixel motion estimating unit. In the half pixel motion estimating unit: the pixels are sequentially inputted in vertical line direction of the reference block; the pixels of one vertical line-delayed reference block are sequentially inputted in horizontal line direction; an absolute errors are generated by performing operations for outputs from the interpolator; a half pixel motion vector or an integer motion vector having the minimum absolute error is selected by respectively comparing the absolute errors to the absolute error from the integer pixel motion estimation; and an integer pixel motion vector or a motion vector resulting from summing the integer pixel motion vector with the half pixel motion vector is outputted.
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Daewoo Electronics Co. Ltd.
Lee Richard
LandOfFree
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