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PYTHON480 データシート(PDF) 29 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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PYTHON480 データシート(HTML) 29 Page - ON Semiconductor

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PYTHON 480
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ADDITIONAL FEATURES
Multiple Window Readout
The PYTHON 480 image sensors support multiple
window readout, which means that only the user−selected
Regions Of Interest (ROI) are read out. This allows limiting
data output for every frame, which in turn allows increasing
the frame rate. Up to four ROIs can be configured.
Window Configuration
Figure 25 shows the four parameters defining a region of
interest (ROI).
Figure 25. Region of Interest Configuration
y-start
y-end
x-start x-end
ROI 0
x−start[8:0]
x−start defines the x−starting point of the desired window.
The sensor reads out 2 pixels in one single clock cycle. As
a consequence, the granularity for configuring the x−start
position is also 2 pixels for no sub sampling. The value
configured in the x−start register is multiplied by 2 to find
the corresponding column in the pixel array.
x−end[8:0]
This register defines the window end point on the x−axis.
Similar to x−start, the granularity for this configuration is
one kernel. x−end needs to be larger than x−start.
y−start[9:0]
The starting line of the readout window. The granularity
of this setting is one line, except with color sensors where it
needs to be an even number.
y−end[9:0]
The end line of the readout window. y−end must be
configured larger than y−start. This setting has the same
granularity as the y−start configuration.
Up to four windows can be defined, possibly (partially)
overlapping, as illustrated in Figure 26.
NOTE: The least significant configuration bits for x and
y parameters are located in separate registers
(refer to registers 264−265). One may decide not
to reconfigure these bits, in which case the
configuration granularity becomes 4 pixels for
both x− and y−configurations.
Figure 26. Overlapping Multiple Window
Configuration
y0_start
y1_start
y0_end
y1_end
x0_start
x1_start
x0_end
x1_end
ROI 0
ROI 1
The sequencer analyses each line that need to be read out
for multiple windows.
Restrictions
The following restrictions for each line are assumed for
the user configuration:
Windows are ordered from left to right, based on their
x−start address:
x_start_roi(i)
x_start_roi(j) AND
v
x_end_roi(i)
x_end_roi(j)
v
Where j i
>
Processing Multiple Windows
The sequencer control block houses two sets of counters
to construct the image frame. As previously described, the
y−counter indicates the line that needs to be read out and is
incremented at the end of each line. For the start of the frame,
it is initialized to the y−start address of the first window and
it runs until the y−end address of the last window to be read
out. The last window is configured by the configuration
registers and it is not necessarily window #3.
The x−counter starts counting from the x−start address of
the window with the lowest ID which is active on the
addressed line. Only windows for which the current
y−address is enclosed are taken into account for scanning.
Other windows are skipped.


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