Apparatus for generating a motion vector with half-pixel precisi

Details Apparatus for generating a motion vector with half-pixel precisi Apparatus for generating a motion vector with half-pixel precisi

1993-11-04

1995-10-24

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348402, 348405, 348407, 348409, 348412, 348699, 348700, H04N 746, H04N 726

Patent

active

054614236

ABSTRACT:
Apparatus for generating a motion vector for use in compressing a digital motion picture signal. The apparatus comprises a circuit for obtaining a primary motion vector with one pixel precision between a picture block of the current picture and a designated block of the reference picture. The apparatus also includes a parallelizing circuit for convening the pixel data of the reference picture into parallel pixel data. The apparatus also includes a search area selecting circuit for selecting the parallel pixel data of a search area of the reference picture in response to the primary motion vector. The search area surrounds and includes the designated block. An interpolating circuit generates parallel half-pixel data from the parallel pixel data of the search area by interpolation in plural parallel paths. The interpolating circuit also selects sets of parallel half-pixel data from the parallel half-pixel data generated in the plural parallel paths, and serializes the sets of parallel half-pixel data to provide parallel matching blocks of half-pixel data. The matching blocks have shifts relative to the designated block of -1/2, 0, and +1/2 pixel, horizontally and vertically. The apparatus further includes a circuit for identifying the one of the matching blocks that most closely matches the picture block as a reference block. Finally, a motion vector calculating circuit calculates the motion vector with half-pixel precision from the primary motion vector and the shift of the reference block.

REFERENCES:
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patent: 4862267 (1989-08-01), Gillard
patent: 4897720 (1990-01-01), Wu et al.
patent: 4937666 (1990-06-01), Yang
patent: 4982285 (1991-01-01), Sugiyama
patent: 4985768 (1991-01-01), Sugiyama
patent: 5030953 (1991-07-01), Chiang
patent: 5083202 (1992-01-01), Parke
patent: 5142360 (1992-08-01), Niihara
patent: 5173771 (1992-12-01), Kitazato
patent: 5173772 (1992-12-01), Choi
patent: 5226093 (1993-07-01), Iwase
"Very High Efficiency VLSI Chip-Pair for Full Search Block Matching With Fractional Precision," Kun-Min Yang et al., pp. 2437-2440, CH2673-2/0.80/0000-2437-1989 IEEE.

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