Annotation
1. NUC (non-uniformity correction)
Because of special technic, a thermal camera without NUC will get the 4-1a image when
shooting at a target with uniform temperature. The spots in the image are called “bad
pixels”, and the shade (with uneven brightness) is generally called “ghost”. Both of them
will affect detection especially when detecting a long range target. After NUC, when
shooting at a target with temperature, the camera will get the 4-1b image. Thus, it is avoid
that the camera will get a false target.
Fig 4-1a before NUC Fig 4-1b after NUC
NUC is fulfilled for camera before delivering to customer. However, different temperature,
different electrical environment and different target will ask for different condition of thermal
camera, so we supply the most effective and efficient correction method, enabling you to
adjust the camera in work site
2. Bad Pixels
In 4-1a, the spots are bad pixels
，
they are caused by ultra-high or low response rate between
pixel and IR radiation. Their values are relative. It means that the response value from bad
pixel is higher or lower than the normal pixels around them which will affect detection. So,
general bad pixels have their response. Only part of them is “real” bad pixels because they
have no response at all, they are called dead pixels. Bad pixel is a spot in infrared image
whose coordinates doesn’t change along with target varies. When you do bad pixels
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Summary of Contents for IR136
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