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Can be used to reduce light shapes found in the input image. Details in the OpenCV documentation for erode and morphological transformations.
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Polar transform
Finds the biggest circle in the image (found circle can be seen in the left image showing the Stage 1 layer of polar transform), then transforms it using polar coordinates. Minimal distance between circles can be used to adjust how many circles will be found by defining a minimum distance that needs to be between their centers. The inverse ratio of the accumulator/image resolution is used to adjust accumulator resolution (the lower the ratio, the higher the accumulator resolution). Details in the OpenCV documentation for Hough circles and polar warp.
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Converts the image into a different color space (HLS, HSV, YUV, LAB, or GRAY). Details in the OpenCV documentation.
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Adjust gamma
This function lets you adjust the gamma value.
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Camera calibration
This function can be used to remove some camera-related distortions of the image.
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