參數(shù)資料
型號： TMC2302A
廠商： Fairchild Semiconductor Corporation
英文描述： Image Manipulation Sequencer
中文描述： 圖像處理序列
文件頁數(shù)： 21/36頁
文件大?。?/td> 188K
代理商： TMC2302A
PRODUCT SPECIFICATION
TMC2302A
21
P
Table 6. Relative Bit Weighting – Source Address
2
47
2
46
… 2
40
Transform
Parameters
Internal Source
Address Generator
Source Address
Output SADR
23-0
Extended Mode Only
TADR
11-0
KADR
7-0
FOV = 0001
FOV = 0002
FOV = 8000
Note:
1. A minus sign indicates a sign bit.
Weight Word
2
39
32
39
… 32
2
31
… 2
25
2
24
2
23
… 2
16
31
… 25
24
2
15
… 2
12
… 2
8
2
7
… 2
0
-47 46
… 40
23
… 16
7
… 0
-47 46
… 40
39
… 32
31
… 25
24
23
… 16
7
… 0
-23 22
… 16
15 … 8
11 … 4
3
… 0
2
7
2
6
… 2
0
… 2
1
2
0
…
2
7
2
7
… 2
1
2
0
Utilization of the Image Boundary
Flags SVAL and TVAL
As mentioned above, the TMC2302A provides two program-
mable valid address, or boundary flags. The source valid flag
SVAL is asserted when the current source image address
output for that device's source image dimension is within the
space defined by the configuration parameters XMIN and
XMAX, or YMIN and YMAX, or ZMIN and ZMAX, as
appropriate. Also, the target valid flag TVAL is available to
indicate when the current target image address values fall
within the space defined by the configuration parameters
UMINI, UMAXI, VMINI, VMAXI, and also WMINI and
WMAXI in three-dimensional systems. Note that all of these
parameters are each programmed into each individual
TMC2302A. Thus, the user could define two (or three) dif-
ferent working spaces, one indicated by each IMS device.
Figure 8 may help clarify the relationships among (X
0
,
Y
0
, Z
0
), (UMIN, VMIN, WMIN), and (UMAX, VMAX,
WMAX), for the two-dimensional case. With positive first
derivatives, (X
0
, Y
0
) and (UMIN, VMIN) represent the upper
left corners of the original image and the new destination
field, respectively. The lower right corner of the new trans-
formed image is located at (UMAX, VMAX); the location of
the corresponding corner of the original image depends on
the values of the derivatives.
Not to be confused with (X
0
, Y
0
), the points (XMIN, YMIN)
and (XMAX, YMAX) define the “usable” rectangular por-
tion of the original image which is indicated by the valid
address flag SVAL; points (X, Y) lying outside this region
are ignored in most resampling and filtering applications.
Specifically, the point (X
0
, Y
0
) is the location from which the
TMC2302A system begins the image resampling sequence.
Every step beyond that point in the source image space is
defined by the address generators implementing the image
transformation polynomials.
The valid source address flag feature permits one to con-
struct a mosaic of several abutting subimages in the (X, Y)
plane, without danger of edge effect interference between
adjacent subimages. Note in the figure that the upper right
corner of the resampled source image lies outside the admis-
sible region; in practice, the values fetched at these locations
will not be included in the convolutional sums. One might,
for instance, program these boundary values to alert the
system that an edge is being approached and to modify the
interpolation coefficients appropriately, or simply to ignore
pixel values outside the defined space.
The TVAL however is utilized somewhat differently. Work-
ing in unison with the target address working space defined
by UMIN/UMAX, etc. the target address valid flag could be
programmed to delineate image areas other than the immedi-
ate working space, and the flag of each TMC2302A to indi-
cate the unique regions anywhere within the target image.
With this flexibility, the user can generate windows, “pic-
ture-in-picture” composite multiple images, or simply switch
to a background image or border color. To make TVAL func-
tion properly, the used must set UMIN < UMINI < UMAXI
< UMAX; likewise for V and, if used, W.
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