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參數(shù)資料
| 型號： | M65727FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | MPEG2 MOTION ESTIMATION LSI |
| 中文描述： | 大規(guī)模集成電路的MPEG2運動估計 |
| 文件頁數(shù)： | 26/55頁 |
| 文件大?。?/td> | 242K |
| 代理商： | M65727FP |
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DISTRIBUTION RESTRICTED. COPYRIGHT RESERVED 1995
CONTACT MITSUBISHI ELECTRONICS REGARDING DISTRIBUTION
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* Priority order of the distortion equivalent vector for expansion lower
During the expansion lower range mode, the distortion equivalent vector uses Vector (0, -8/-16)
location as the top priority and uses the priority order given by the following equation.
P (X, Y) = |X| + (Y+16)
The smaller the value of P (X,Y), the higher the priority.
Each mode has vectors having the same priority. However, among them, if the motion vector in
horizontal direction is close to negative infinity or the same, the side whose dynamic vector in vertical
direction is closer to the negative infinity has the priority.
Fig. 5.2-1 shows the order of priority for the distortion equivalent vector.
5.3 Detail of Vector Search Range
In case of the non-expansion mode, the motion vector search range of M65727 is ±7.5/±15.5
displacement in vertical direction. When integer precision search mode is specified, the search range is
±7/±15.
When the integer precision search mode is specified, the horizontal search ranges become as follows:
±15.5 -> ±15.0, ±31.5 -> ±31.0, ±63.5 -> ±63.0, ±127.5 -> ±127.0
5.4 Formats for External Frame Memory (Search Window Image Memory)
The external frame memory (Search window image memory) used by M65727 has two formats.
One is field format and the other is frame format. Field format indicates the state in which field images
are stored in succession. One word (32 bits) stores 4 pixels lined up in succession vertically in one
field. Frame format indicates that frame images are stored in succession. Within one word (32 bits),
four continuous pixels are stored vertically within one frame. (Field pixels of different parity are
alternately stored.) It is necessary that the boundary of 4 pixels stored in one word must agree with the
boundary of macro block no matter which format is used.
The format for external frame memory depends on the mode as follows:
*Field mode
Field format only
*Frame mode
Field format or frame format
*Field Dual-Prime mode
Field format only
*Frame Dual-Prime mode
Field format only
5.5 Expansion of Search Range and Controlling the Validity of Search Range
One M65727 chip is capable of searching ±7.5 pixels in horizontal direction and ±7.5/±15.5 in
vertical direction. Fig. 5.5-1 shows the controlling conditions necessary for one chip operation.
When the horizontal search range is expanded (±15.5 ~ ±127.5), the following number of chips is
needed.
±15.5:
2 chips
±31.5:
4 chips
±63.5:
8 chips
±127.5:
16 chips
Fig. 5.5-2 shows the conditions needed for the search range control when horizontal search range is
expanded.
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