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Separation of overlapping dental arch objects using digital records of illuminated plaster casts

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Academic year: 2020

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Figure

Figure 1 Digital data acquisition of the orthodontic plaster cast by a digital camera for a, b top illumination, c right hand side illumination, and d left hand side illumination.
Figure 2 Image enhancement including a combination of images with side illumination, b merging of images with central/outside illumination, c merging of images with top wide/narrow angle illumination, and d fusion of merged images resulting in the final image.
Figure 3 Block diagram of the proposed methodology including a image acquisition and data fusion, b image de-noising and the use of Hough transform for detection of individual objects, c segmentation based on the region growing method, and d evaluation of dental arch parameters.
Figure 4 Identification steps of common boundary detection presenting a selected area of the original image, b dental subimage with two connected neighbouring regions, c, d details of areas (A) and (B) with smoothed boundaries, e, f vectors related to the second derivative of the boundaries showing local convexity in areas (A) and (B), and g resulting segmentation.
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