The Dim Region Detection algorithm is designed to detect larger circular smudges or areas of darker intensities. The filter width and minimum circle width for detection are user configurable parameters. The maximum number of allowable detected dim regions is also configurable.
The algorithm is very similar to the dust and particle detection algorithm. The outputs of this test are also reported in a table of detected regions with region area, width, height, and the (X, Y) coordinates of the region’s center of mass.
Dim Region Detection Input Parameters
Name |
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Description |
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Input Image |
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An 8-bit monochrome luminance image is required for this test. |
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Filter Width |
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An integer specifying the filter width in pixels. |
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Minimum Circle/Region Width |
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Specifies, in pixels, the detected circle width lower threshold diameter. |
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Maximum Number of Dim Regions |
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Specifies the maximum number of allowable dim circles or regions in the image. |
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Dim Region Detection Outputs
Name |
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Description |
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Detected Dim Region Table |
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A table report output contains statistics on every detected dim region including particle area, width, height, center of massX and center of massY. |
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Detected Dim Region Image |
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An output binary image is available with a black background and every detected dim region is shown in white. Text with the total dim region count is also overlaid on the image. |
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