MT9P001 Datasheet, PDF (23/48 Pages) ON Semiconductor – CMOS Digital Image Sensor

MT9P001: 1/2.5-Inch 5Mp Digital Image Sensor
Features
These settings result in the same array layout as above, but only 22 dark rows are avail-
able at the top of the array; the first eight are used in the black level algorithm, and there
should be a two-row buffer between the black region and the active region.
Window Control
The output image window of the pixel (the FOV) is defined by four register fields.
Column_Start and Row_Start define the X and Y coordinates of the upper-left corner of
the FOV. Column_Size defines the width of the FOV, and Row_Size defines the height of
the FOV in array pixels.
The Column_Start and Row_Start fields must be set to an even number. The Column_-
Size and Row_Size fields must be set to odd numbers (resulting in an even size for the
FOV). The Row_Start register should be set no lower than 12 if either Manual_BLC is
clear or Show_Dark_Rows is set.
If no special resolution modes are set (see below), the width of the output image, W, is
Column_Size + 1 and the height, H, is Row_Size + 1.
Readout Modes
Subsampling
Skipping
By default, the resolution of the output image is the full width and height of the FOV as
defined in “Window Control”. The output resolution can be reduced by two methods:
Skipping and Binning.
Row and column skip modes use subsampling to reduce the output resolution without
reducing FOV. The MT9P001 also has row and column binning modes, which can reduce
the impact of aliasing introduced by the use of skip modes. This is achieved by the aver-
aging of 2 or 3 adjacent rows and columns (adjacent same-color pixels). Both 2X and 4X
binning modes are supported. Rows and columns can be binned independently.
Skipping reduces resolution by using only selected pixels from the FOV in the output
image. In skip mode, entire rows and columns of pixels are not sampled, resulting in a
lower resolution output image. A skip 2X mode skips one Bayer pair of pixels for every
pair output. Skip 3X skips two pairs for each one pair output. Rows and columns are
always read out in pairs. If skip 2X mode is enabled with otherwise default sensor
settings, the columns in the output image correspond to the pixel array columns 16, 17,
20, 21, 24, 25... .
Figure 14: Eight Pixels in Normal and Column Skip 2X Readout Modes
LV
Normal readout
DOUT[11:0]
LV
Column skip 2X readout
DOUT[11:0]
G0
R0
G1
R1
G2
R2
G3
R3
[11:0] [11:0] [11:0] [11:0] [11:0] [11:0] [11:0] [11:0]
G0
R0
G2
R2
[11:0] [11:0] [11:0] [11:0]
MT9P001_DS Rev. L 4/15 EN
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