Appeal No. 1998-1334
Application No. 08/350,141
The invention relates to a method for performing a
correct motion estimation by preventing the adverse effects
due to variation in lighting conditions.
Independent claim 1 is reproduced as follows:
1. A method for estimating a motion by dividing an image
frame represented by a luminance signal into a plurality of
predetermined size blocks and for detecting a most similar
block in a previous frame with a block in a current frame and
producing a corresponding movement distance as a motion
vector, comprising the steps of:
producing a mean value of the luminance signal with
regard to a block of the current frame;
producing a mean value of the luminance signal with
regard to a block to which a motion estimation of the previous
frame is applied;
compensating the luminance signal of the block to which
the motion estimation of the previous frame is applied such
that the first and second mean values are equal to each other;
and
selecting a block having the minimum sum of differences
between the luminance signals of each pixel, with regard to
the block of the current frame and the block to which a motion
estimation of the previous frame is applied, respectively, and
producing a movement distance between these blocks as a motion
vector.
The reference relied on by the Examiner is as follows:
Iu 5,361,105 Nov. 1,
1994
2
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