ICX274 SONY [Sony Corporation], ICX274 Datasheet - Page 17

• Manufacturer Part Number: ICX274
• Description: Diagonal 8.923mm (Type 1/1.8) Progressive Scan CCD Image Sensor with Square Pixel for Color Cameras
• Manufacturer: SONY [Sony Corporation]

Description of Center Scan and AF Mode Operation
The center scan and AF modes realize high frame rates by sweeping the top and bottom of the picture with
high-speed transfer and cutting out the center of the picture.
The various readout modes during center scan and AF operation are described below.
• AF modes
• Center scan modes
The readout method, frame rate, number of output lines and other information for each readout mode are
shown in the table below.
Progressive scan mode
2/8-line readout mode
2/4-line readout mode
2-line addition mode
Center scan mode (1)
Center scan mode (2)
Center scan mode (3)
AF mode (1)
AF mode (2)
Center scan and AF modes
AF mode (1), (2): The output method is the same as readout in 2/8-line readout mode.
Center scan mode (1): The output method is the same as 2/4-line readout mode.
Center scan mode (2): The output method consists of 2-line addition readout whereby the signals for only
Center scan mode (3): The output method is the same as progressive scan mode.
Mode
two out of four lines (3rd and 4th lines, 7th and 8th lines, and so on) are read out,
the vertical register is shifted by 2 bits, and then the signals of the remaining two
out of the four lines (1st and 2nd lines, 5th and 6th lines, and so on) are read out
and added within the vertical register.
Progressive scan
2/8-line readout
2/4-line readout
2/4-line readout
2/4-line readout
2-line addition readout
Progressive scan
2/8-line readout
2/8-line readout
Readout method
Undesired portions (Swept by vertical register high-speed transfer)
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Vertical 2-line
Vertical 2-line
Addition
method
Picture center cut-out portion
None
None
None
None
None
None
None
Frame rate (frame/s)
28.6MHz
119.88
29.97
19.98
19.98
29.97
29.97
29.97
59.94
9.99
36MHz
14.985
119.88
29.97
19.98
19.98
29.97
29.97
29.97
59.94
28.6MHz
Number of output
effective pixel data
lines
1220
1220
305
610
434
434
444
170
43
ICX274AQF
36MHz
1220
1220
305
610
568
568
580
235
75