MT9V032 Datasheet, PDF (63/74 Pages) ON Semiconductor – Inch Wide-VGA CMOS Digital Image Sensor

MT9V032: 1/3-Inch Wide-VGA Digital Image Sensor
Electrical Specifications
Test 4: Dynamic Range
A temporal noise measurement is made with the image sensor in the dark and analog
gain changed to the maximum setting of 4X. Signals are measured in LSB on the sensor
output. Two consecutive dark frames are captured. Temporal noise is calculated as the
average pixel value of the difference frame:
N_p
 ^S1i ^{– S}2i^2
_i =
i_---=_----1_{-----------------------------}
2  N_p
(EQ 20)
Where S_1i is the signal measured for the i-th pixel from the first frame, S_2i is the signal
measured for the i-th pixel from the second frame, and N_p is the total number of pix-
els contained in the array.
The dynamic range is calculated according to the following formula:
DynamicRange
=
20  log
-4----^-----1---0---2---2-
_t
Where _t is the temporal noise measured in the dark at 4X gain.
Test 5: Signal-to-Noise Ratio
(EQ 21)
A flat-field light source (90 lux, color temperature 4400K, broadband, with IR cut filter) is
used as an illumination source. Signals are measured in LSB on the sensor output. Two
consecutive illuminated frames are captured. Temporal noise is calculated as the
average pixel value of the difference frame (according to the formula shown in Test 4).
The signal-to-noise ratio is calculated as the ratio of the average signal level to the
temporal noise according to the following formula:
 ^Np  
 ^

S_{1i}  N_{p}
Signal – to – Noise – Ratio = 20  log -^--^---ⁱ---⁼----¹----_----_t-^--------------^-
(EQ 22)
Where _t is the temporal noise measured from the illuminated frames, S_1i is the signal
measured for the i-th pixel from the first frame, and N_p is the total number of pixels
contained in the array.
MT9V022_DS Rev. G 6/15 EN
58
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