M65727FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M65727FP

MPEG2 MOTION ESTIMATION LSI

MITSUBISHI ELECTRIC  

DISTRIBUTION RESTRICTED. COPYRIGHT RESERVED 1995

3. Outline of Functions

3.1 Outline

M65727 is configured as shown in Fig. 3.11. Its main components are the Input Unit, the Integer-pel

Unit, the Motion detection Unit, the Half-pel / Dual-Prime Unit, and the Output Unit. When the

Field/Frame mode is selected, the search window image data and template MB data are inputted to the

Input Unit from their respective input ports. The data is used as the source data of the Integer-pel Unit

after its order is changed. Then, the mean absolute error is calculated for each cycle at the Integer-pel

Unit and the result is given to the Motion detection Unit and the best integer-pel precision motion

vectors are estimated. Then, at the Half-pel Unit, the best half-pel precision motion vectors are

estimated. The results are output from the Output Unit. When the Field/Frame Dual-Prime mode is

selected, the template MB data and the search window image data of the first field and the second field

are sent to the Input Unit from their respective input ports and become the source data of the Dual-Prime

Unit. Then, the motion vector estimation is conducted at the Dual-Prime Unit and the results are

output from the Output Unit. The functions of each unit are outlined below.

3.2 Block Configuration

3.2.1 Input Unit

The function of Input Unit is to output the search window image data and the template MB data to the

Integer-pel Unit or Dual-Prime Unit with the necessary sequence and timing.

Having this block enables the user to input comparatively freely the needed search window image data,

using the sync signal (SSYNC) and the data enable signal (DENSWC), without regard to the motion

estimation sequence. Similarly, necessary template MB data can be inputted fairly freely using the sync

signal (MSYNC) and the data enable signal (DENMBC).

The search window image data is inputted from the highest line towards the lowest line scanning left to

right. The output sequence, on the other hand, starts from the leftmost column to the rightmost column

and scans top to bottom. The input and output sequence of the search window image data for Dual-

Prime are from the highest line to the lowest line and scanning from left to right. The search window

image data is inputted as 4 vertical continuous pixels using the 32 bit input port. The Input Unit outputs

a pixel per cycle by parallel-serial conversion.

3.2.2 Integer-pel Unit

The function of this block is to calculate the mean absolute error using the template MB data and the

search window image data coming from the Input Unit. The Integer-pel Unit is composed of

processing elements arranged in parallel, allowing high speed processing of the data to be evaluated.

Three sets of calculated mean absolute error (corresponding to 16x16 block and two sets of 16x8 block)

are given to the Motion detection Unit. Three sets of search window image data and the template MB

data that correspond to the three sets of vectors are transferred from the integer-pel Unit to the Half-pel

Unit.

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