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PYTHON480 データシート(PDF) 30 Page - ON Semiconductor

部品番号 PYTHON480
部品情報  Megapixel Global Shutter CMOS Image Sensor
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
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PYTHON 480
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Figure 27 illustrates a practical example of a
configuration with four windows. The current position of
the read pointer (ys) is indicated by a red line crossing the
image array. For this position of the read pointer, three
windows need to be read out. The initial start position for the
x−kernel pointer is the x−start configuration of ROI0.
Kernels are scanned up to the ROI2 x−end position. From
there, the x−pointer jumps to the next window, which is
ROI3 in this illustration. When reaching ROI3’s x−end
position, the read pointer is incremented to the next line and
xs is reinitialized to the starting position of ROI0.
Notes:
The starting point for the readout pointer at the start of
a frame is the y−start position of the first active
window.
The read pointer is not necessarily incremented by one,
but depending on the configuration, it can jump in
y−direction. In Figure 27, this is the case when reaching
the end of ROI0 where the read pointer jumps to the
y−start position of ROI1
The x−pointer starting position is equal to the x−start
configuration of the first active window on the current
line addressed. This window is not necessarily window
#0.
The x−pointer is not necessarily incremented by one
each cycle. At the end of a window it can jump to the
start of the next window.
Each window can be activated separately. There is no
restriction on which window and how many of the 4
windows are active.
Figure 27. Scanning the Image Array with
Four Windows
ROI 0
ROI 3
ys
ROI 2
ROI 1
Subsampling
Subsampling is used to reduce the image resolution. This
allows increasing the frame rate. Two subsampling modes
are supported: for monochrome sensors (LVDS/CMOS) and
color sensors (LVDS/CMOS).
Monochrome Sensors
For
monochrome
sensors,
the
read−1−skip−1
subsampling scheme is used. Subsampling occurs both in x−
and y− direction.
Color Sensors
For color sensors, the read−2−skip−2 subsampling
scheme is used. Subsampling occurs both in x− and y−
direction. Figure 28 shows which pixels are read and which
ones are skipped.
Figure 28. Subsampling Scheme for Monochrome and Color Sensors
Reverse Readout
Reverse readout in y−direction can be done by toggling
reverse_y (reg 194[8]). The reference for y_start and y_end
pointers is reversed.
Reverse readout in x−direction can be done by toggling
reverse_x (reg 194[9]).


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