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### 1.1 Detection of the particles (discs) from white light imaging
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For particles of disc shape, a picture with white light transmitted through particles is usually taken to record their positions.
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For particles of disc shape, a picture with white light transmitted through particles is usually taken to record their positions. The general idea to detect particles then is to . The procedure can be summarized as follows:
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* From one channel of the white light image, a mapping of the intensities to new values by suppressing low and high intensities is employed to increase the contrast of the image.
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