Lens Shading Correction Overview
The Lens Shading Correction algorithm is useful when testing image sensor assemblies that contain optical lenses. There is inevitably some intensity fall-off at the edges of the image sensor, due to the lens system. This intensity fall-off can adversely affect some of the characterization measurements, and for this reason, this lens shading correction algorithm is embedded in many of the other algorithms included with Image Sensor Lab.
An Nth order filter is used for determining the background and the filter order and percentile (rank) is user-configurable.
Lens Shading Correction Input Parameters
Name |
Description |
 |
Input Image |
A Bayer image type or 8-bit monochrome luminance plane image is required for this test. |
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Background Subtraction On/Off |
Specifies if the background subtraction algorithm is enabled. |
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Background Subtraction Filter Nth Order Kernel Size |
Specifies the X and Y grid size of the kernel used for the Nth order filter. |
|
Background Subtraction Filter Nth Order Percentile Threshold |
Specifies the percent threshold used to the order classification of the filter. |
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