AR0833 Datasheet, PDF (34/64 Pages) ON Semiconductor – 8 Mp CMOS Digital Image Sensor

AR0833: 1/3.2-Inch 8 Mp CMOS Digital Image Sensor
Integration Time for Interlaced HDR Readout
Subsampling
The AR0833 supports subsampling to reduce the amount of data processed by the signal
chains in the AR0833, thereby allowing the frame rate to be increased and power
consumption reduced. Subsampling is enabled by setting x_odd_inc and/or y_odd_inc.
Values of 1, 3, and 7 can be supported. Setting both of these variables to 3 reduces the
amount of row and column data processed and is equivalent to the 2 x 2 skipping
readout mode provided by the AR0833. Setting x_odd_inc = 3 and y_odd_inc = 3 results
in a quarter reduction in output image size. Figure 22 on page 34 shows a sequence of 8
columns being read out with x_odd_inc = 3 and y_odd_inc = 1.
Figure 22: Effect of x_odd_inc = 3 on Readout Sequence
LINE_VALID
x_odd_inc = 1
DOUT[9:0]
G0[9:0] R0[9:0] G1[9:0] R1[9:0] G2[9:0] R2[9:0] G3[9:0] R3[9:0]
LINE_VALID
x_odd_inc = 3
DOUT[9:0]
G0[9:0] R0[9:0] G2[9:0] R2[9:0]
A 1/16 reduction in resolution is achieved by setting both x_odd_inc and y_odd_inc to 7.
This is equivalent to 4 x 4 skipping readout mode provided by the AR0833. Figure 23
shows a sequence of 16 columns being read out with x_odd_inc = 7 and y_odd_inc = 1.
Figure 23: Effect of x_odd_inc = 7 on Readout Sequence
LINE_VALID
x_odd_inc = 1
DOUT[9:0]
LINE_VALID
x_odd_inc = 7
DOUT[9:0]
G0[9:0] R0[9:0] G1[9:0] R1[9:0] G2[9:0] ... G7[9:0] R7[9:0]
G0[9:0] R0[9:0] G4[9:0] R4[9:0]
The effect of the different subsampling settings on the pixel array readout is shown in
Figure 24 through Figure 26 on page 36.
AR0833_DS Rev. H Pub. 4/15 EN
34
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