MT9D131 Datasheet, PDF (117/132 Pages) ON Semiconductor – CMOS Digital Image Sensor

MT9D131: 1/3.2-Inch 2-Mp SOC Digital Image Sensor
Start-Up and Usage
The expressions
 x x2 and  y y2 are defined independently for each dimension. These can
be expressed further as:
 x x2= ai x2+ bix + ci
(EQ 3)
and
 y y2= di y2+ eiy + fi
(EQ 4)
To implement the function F (x, y) for each zone, the MT9D131 provides a set of registers
that allow flexible definition of the function F (x, y). These registers contain the following
parameters:
• Operation mode R0x80:2
• Zone boundaries and center offset R0x81:2–R0x87:2
• Initial conditions of:
 x x2 and  y y2
for each color (12-bit wide) R0x88:2–R0x8D:2
• Initial conditions of the first derivative of:
 x x2 and  y y2
for each color (12-bit wide) R0x8E:2–R0x93:2
• The second derivatives of:
 x x2 and  y y2
• The second derivatives of
for each color and each zone (8-bit wide) R0x94:2–R0xAB:2
• Values for k(10-bit wide) and G(8-bit wide) in (2) for all colors and zones are specified
in R0xAD:2 and R0xAE:2. Sign for k is specified in R0x80:2.
There are x2 factor that can be applied to the second derivatives inside each zone
(R0xAC:2) if correction curvature in the particular zone is to be increased. There are also
global x2 factors for all zones in X and Y direction located in R0x80:2. The first derivative
(for both X and Y directions) can be divided by a number (devisor) specified in R0x80:2
before it is applied to the F function. Higher numbers result in more precise curve (full-
scale expanse).
MT9D131_DS Rev. J 5/15 EN
117
©Semiconductor Components Industries, LLC,2015.