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M65727FP

MPEG2 MOTION ESTIMATION LSI

MITSUBISHI ELECTRIC  

DISTRIBUTION RESTRICTED. COPYRIGHT RESERVED 1995

When the Frame Dual-Prime mode is used, the Dual-Prime vector specifying code, its distortion, and

distortions for each displacement point are output in the order shown in Table 4. It takes 21 cycles to

output data.

The integer-pel precision motion vector outputs as motion vector corresponding to 16x16 block even

for 16x8 block. Therefore, during the Frame Estimation Mode, the vertical component of the motion

vector for the 16x8 block must be changed outside.

When multiple chips are used to expand the vertical search range, the vertical components of the

motion vectors must be changed for all blocks.

Fig. 3.3.7-1 shows correspondence between 16x8 block and vectors.

Operational modes

Output sequence

1

2

3

4

5

6

7

Table 2

Integer-pel precision search

Half-pel precision search

Motion vector horizontal

Integer precision motion vector

component

horizontal component

Motion vector vertical

Integer precision motion vector

component

vertical component

Minimum evaluation value (upper 8bits) Minimum evaluation value (upper 8bits)

Minimum evaluation value (lower 8bits) Minimum evaluation value (lower 8bits)

(0, 0) evaluation value (upper 8bits) (0, 0) evaluation value (upper 8bits)

(0, 0) evaluation value (lower 8bits) (0, 0) evaluation value (lower 8bits)

all 0 (L) output

Half-pel indication code

Note 1:

Note 2:

Note 3:

Note 4:

The motion vector is a binary number in 2's complement. It is output after it is expanded to

8 bits.

Upper 8 bits of the evaluation value is first output and the lower 8 bits are output next in

natural binary

Half-pel indication code is specified by the lower 4 bits as shown below. The upper 4 bits

are for L output.

0000: Most suitable for integer-pel precision motion vector

(0.0, 0.0)

1010: Upper-left direction Half-pel of integer-pel precision vector

(-0.5, -0.5)

1001: Upper-right direction Half-pel of integer-pel precision vector

(+0.5, -0.5)

0110: Lower-left direction Half-pel of integer-pel precision vector

(-0.5, +0.5)

0101: Lower-right direction Half-pel of integer-pel precision vector

(+0.5, +0.5)

0010: Left direction Half-pel of integer-pel precision vector

(-0.5, +0.0)

0001: Right direction Half-pel of integer-pel precision vector

(+0.5, +0.0)

1000: Upper direction Half-pel of integer-pel precision vector

(+0.0, -0.5)

0100: Lower direction Half-pel of integer-pel precision vector

(+0.0, +0.5)

The (0,0) evaluation value is an evaluation value corresponding to the no-motion. When

specifying the upper range of expansion, the evaluation point of (X, Y) = (0, +8 / +16) is

used as the position; when specifying the lower range of expansion, the evaluation point of

(X, Y) = (0, -8 / -16) is used as the position.

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