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SWIR Line Camera Series User’s Manual
(OM150000013H-EN)
－ 9 －
2-2
InGaAs Sensor’s Characteristic
InGaAs sensor has unique characteristics and limitations
accordingly, and while using SWIR camera you may see
the phenomenon as described below due to the sensor’s
characteristic and operating principles.
NOTE This chapter is describing about InGaAs sensor and
some of contents are not relevant to camera’s specification.
Blooming
When shooting a bright light source, the source of the
light may appear as a bright halo around the highlight.
Horizontal Smear
When shooting a bright light source, it may appear the
horizontal stripe.
Blooming & Horizontal Smear
Aliasing
It comes especially with continuous(geometrc) model
such as stripes, line, etc., and makes moire patterns
or jaggies in the image.
Defect Pixel
It is the pixel that does not have linearity in regard to
light intensity to video level. Generally, InGaAs sensor
has more defect pixels compared to Si Sensor.
Black Spot
This is the pixel that output luminance is lower than
surrounding pixels, and it is caused by that the
electron is leaked to the pixels top or down, left or
right.
White Spot
This is the pixel that output luminance is higher than
surrounding pixels, and it may appear with long
exposure.
Other Pixel Defect
・ Several defect spots adjacent each other
(Cluster defect)
・ Linearity of output luminance is considerably low
・
Defect pixels appear on specific frame only
White Spot & Black Spot
Video Level & Light Intensity
White Pixel
Occasionally white pixel may appear caused by cosmic ray.
This comes with the principle of InGaAs sensor’s operation.
Horizontal Channel Difference
The sensor is able to output by 2 or 4 channels at once.
In case of this operation, it may cause luminance level
difference horizontally due to each channel’s performance.
This case is resolved by shading correction function.
Etc.,
In case of using the camera under one of below
environment, it may occur degradation of image quality.
・
Operation in high temperature
・ Gain offset
・
Long Exposure
NOTE
When the bright light source is exposed to the sensor, it
makes the image darker. Bright light direct exposure may
cause sensor damage. So, avoid the sensor to be exposed
such light or adjust the light intensity by lens.
White Spot
Average Pixel
Black Spot
Light Intensity
V
id
e
o L
ev
e
l(1
4b
it)
White Stpot
Black Spot
Horizontal Smear
Blooming