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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Quantitative measurement of bubble textures in pumice clasts using a digital stereo microscope with low-angled ring illumination

Fig. 3

Digital stereo microscope images. Images a with the conventional light (Fig. 2a) and b with the adjustable low-angled ring illumination (Fig. 2b). c A green/transparent binary image overlying the image of b. The green-colored parts are bubbles recognized by image processing. ‘T’ indicates trace holes of crystals. d A white/black binary image of the recognized bubbles. Ellipses fitting the bubbles are shown in red. The white bar shows a 5-mm scale in all panels

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