MT9M114_16 Datasheet, PDF (18/62 Pages) ON Semiconductor – High-Definition (HD) System-On- A-Chip (SOC) Digital Image Sensor

MT9M114: 1/6-Inch 720p High-Definition (HD) System-On-A-Chip (SOC) Dig-
ital Image Sensor
Figure 11: Imaging a Scene
Lens
Sensor (rear view)
Scene
Column Readout Order
Row
Readout
Order
Pixel (0,0)
The sensor core supports different readout options to modify the image before it is sent
to the IFP. The readout can be limited to a specific window size of the original pixel array.
By changing the readout directions, the image can be flipped in the vertical direction
and/or mirrored in the horizontal direction.
The image output size is set by programming row and column start and end address
variables.
When the sensor is configured to mirror the image horizontally, the order of pixel
readout within a row is reversed, so that readout starts from the last column address and
ends at the first column address. Figure 12 shows a sequence of 3 pixels being read out
with normal readout and reverse readout. This change in sensor core output is corrected
by the IFP.
Figure 12: Three Pixels in Normal and Column Mirror Readout Mode
LINE_VALID
Normal readout
DOUT[7:0]
Reverse readout
DOUT[7:0]
G0
G0
R0
R0
G1
G1
(9:2) (1:0) (9:2) (1:0) (9:2) (1:0)
G1
G1
R0
R0
G0
G0
(9:2) (1:0) (9:2) (1:0) (9:2) (1:0)
When the sensor is configured to flip the image vertically, the order in which pixel rows
are read out is reversed, so that row readout starts from the last row address and ends at
the first row address. Figure 13 on page 19 shows a sequence of 3 rows being read out
with normal readout and reverse readout. This change in sensor core output is corrected
by the IFP.
MT9M114/D Rev. 11, 2/16 EN
18
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