M65727FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M65727FP

MPEG2 MOTION ESTIMATION LSI

MITSUBISHI ELECTRIC  

DISTRIBUTION RESTRICTED. COPYRIGHT RESERVED 1995

1. Outline

1.1 Outline

The M65727 is a highly efficient motion estimation LSI used to estimate motion vectors for real-time

encoding of dynamic images. M65727 can be used together with the frame memory, the M65721

(Controller LSI) and the M65722 (Pixel Processor LSI). It operates under the control of the M65721.

M65727 accepts the template macro block (MB) data inputs from the M65721 and accepts the search

window image data from the frame memory. It estimate the motion vectors by searching the minimum

value of the mean absolute error between template block data and search window image data. It outputs

the result to the M65721. The M65721 and the M65722 are able to generate prediction image using the

above mentioned motion vector. The M65727 is designed so that it is applicable to MPEG2, the

international video compression standard.

[Main Specifications]

Field Mode (per field)

*Block size

16x16 and 16x8 (Upper), 16x8 (Lower) simultaneously

*Search range

Vertical direction: ±7.5(*A) / ±15.5 pixel (Switchable)

However, ±8.0(*A) / ±16.0 are used during expansion respectively

Horizontal direction: ±7.5 / ±15.5 / ±31.5 / ±63.5 / ±127.5 pixel

(Selectable)

*Search methods Integer-pel precision exhaustive search

Half-pel precision 9 points around the best integer-pel precision vector

(Including the integer precision location)

*Evaluation function Full sampled mean absolute error

*Execution cycle Dependent on the search range

The execution cycle mentioned here refers to the throw-in period of MB,

not the 1MB processing time.

ex. 1 (Horizontal ±7.5, vertical ±7.5) (550) cycles / ΜΒ

ex. 2 (Horizontal ±15.5, vertical ±7.5) (550) ∗2 cycles / ΜΒ

ex. 3 (Horizontal ±7.5, vertical ±15.5) (806) cycles / ΜΒ

ex. 4 (Horizontal ±15.5, vertical ±15.5) (806) ∗2 cycles / ΜΒ

*Search window image inputs

When vertical ±7.5 is searched: 512 pixels / (550) cycles

When vertical ±15.5 is searched: 768 pixels / (806) cycles

*Processing capability

27MHz operation: Processing the search range over horizontal ±7.5 and

vertical ±7.5 for the ITU-R 601 image size is possible.

40MHz operation: Processing the search range over horizontal ±7.5

and vertical ±15.5 for the ITU-R 601 image size is possible.

*A: The mode of vertical search range is ±7.5 can be used only under 27MHz

operation.

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