MT9D015 Datasheet, PDF (44/75 Pages) ON Semiconductor – CMOS Digital Image Sensor

MT9D015: 1/5-Inch 2 Mp CMOS Digital Image Sensor
Features
Vertical Flip
When the vertical_flip bit is set in the image_orientation register, the order in which
pixel rows are read out is reversed, so that row readout starts from y_addr_end and ends
at y_addr_start. Figure 19 shows a sequence of 6 rows being read out with
vertical_flip = 0 and vertical_flip = 1. Changing vertical_flip causes the Bayer order of the
output image to change; the new Bayer order is reflected in the value of the pixel_order
register.
Figure 19: Effect of vertical_flip on Readout Order
FRAME_VALID
vertical_flip = 0
DOUT(9:0)
Row0 [9:0] Row1 [9:0] Row2 [9:0] Row3 [9:0] Row4 [9:0] Row5 [9:0]
vertical_flip = 1
DOUT(9:0)
Row5 [9:0] Row4 [9:0] Row3 [9:0] Row2 [9:0] Row1 [9:0] Row0 [9:0]
Subsampling
The MT9D015 supports subsampling. Subsampling reduces the amount of data
processed by the analog signal chain in the MT9D015 thereby allowing the frame rate to
be increased. Subsampling is enabled by setting x_odd_inc and/or y_odd_inc. Values of
1 and 3 can be supported. Setting both of these variables to 3 reduces the amount of row
and column data processed. Figure 20 shows a sequence of 8 columns being read out
with x_odd_inc = 3 and y_odd_inc = 1.
Figure 20: 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]
MT9D015_DS Rev. M Pub. 4/15 EN
44
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