參數(shù)資料
型號(hào)： SCM20014
廠商： Motorola, Inc.
英文描述： VGA Digital Image Sensor(VGA數(shù)字圖像傳感器)
中文描述： VGA數(shù)碼圖像傳感器（顯卡數(shù)字圖像傳感器）
文件頁(yè)數(shù)： 6/54頁(yè)
文件大?。?/td> 911K
代理商： SCM20014
MOTOROLA
SCM20014
6
Preliminary!! Last Update: 12/14/99
used in still video while complementary are used in real
time video applications.
Figure 4. Optional on-chip Bayer CFA
Applications requiring higher sensitivity can benefit from
the optional micro-lens arrays shown in
Figure 5
. The
lenslet arrays can improve the fill factor (aperture ratio)
of the sensor by 1.5-2x depending on the F number of
the main lens used in the camera system. Microlenses
yield greatest benefits when the main lens has a high F
number. As a caution, unoptimized F numbers can lead
to optical aberrations hence, care should be taken when
incorporating microlens equipped imagers into camera
systems/heads. The fill factor of the pixels without mi-
crolenses is 35%.
Figure 5. Improvement in pixel sensitivity results
from focusing incident light on photo sensitive por-
tions of the pixel by using microlenses.
2.1.3 Frame Capture Modes
Depending on the application the user may choose be-
tween the two available Frame Capture Modes (FCMs).
An overview of the operation of the two modes and sug-
gested guidelines for selection are given in this section.
The default mode of image capture is the Continuous
Frame Capture Mode (CFCM). This mode is most suit-
able for full motion video capture and will yield VGA
sized frame rates up to 36fps at 13.5 MHz MCLK. In this
mode the image integration and row readout take place
in parallel. While a row of pixels is being integrated, an-
other row is being readout. Since the integration time
(T
int
) is equal for all rows, the start of the integration pe-
riods for rows is staggered out. This mode relies on the
integration periods of the rows being long enough to
produce a reasonable overlap of the sequential rows. If
this is not the case then image artifacts may be pro-
duced in instances where the target is moving very fast
or the illumination is varying.
The second available capture mode is called Single
Frame Capture Mode (SFCM). This mode consists of
global integration of all pixels, next a simultaneous
transfer to the Floating Diffusion (FD) node of all pixels
followed by a sequential read out of all rows. This mode
is best suited for still or “single snap shot” capture of an
image where a flash illumination is utilized.
SFCM should only be used when the ambient lighting
will not cause the pixels to saturate during the readout
time.
The user chooses the scan mode via the
Capture Mode
Control Register, (Table 24), on page 32
.
2.1.4 Image Scan Modes
The SCM20014 has two available image scanning
modes: interlaced and progressive.
Interlacing is a technique used in TV systems that is
used to enhance the vertical resolution of the picture
without increasing the bandwidth of the transmission
system. A spatial offset is introduced on the display sys-
tem between the odd and even fields. An odd field con-
sists of rows 1,3,5,7,9.... while an even field comprises
rows 2,4,6,8..... Since the spatial offset is exactly half
the vertical pitch of the sensor, the even and odd fields
appear interdigitated when displayed on top of one an-
other, thus appearing to improve the sensor’s vertical
resolution. By definition two interlaced fields comprise a
frame. It should be noted that at high frame rates, mo-
tion between fields in interlaced video can cause smear
and/or serrations to appear in the image.
Progressive scanning refers to non-interlaced or se-
quential row by row scanning of the entire sensor in a
single pass. The image capture happens at one instant
of time. This mode is primarily used in applications
where vertical resolution is of prime importance and
available bandwidth of the transmission system does
not impose any limitations.
R
R
R
R
G1
G1
G1
G1
G2
G2
G2
B
B B
B
G2
B
B
Iris
microlenses
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