By Wahlin

ISBN-10: 0471912026

ISBN-13: 9780471912026

Booklet by means of Wahlin

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400 x Fig. 3-45 Contours of external boundary of sclera on scans A and B (Fig. 3-43) ) in a Cartesian coordinate system ANALYSIS OF ANTERIOR EYE SEGMENT To simplify the notation, let us further assume that the function determining necessary contours and the filtration angle will be defined as: [Ls,L22,xy_g_l, xy_d_l, xy_g_p, xy_d_p,linie_12]=OCT_angle_line(Ls); where the OCT image is an input parameter and at the output we obtain, in accordance with the previous section:  xy_d_l coordinates x and y of the filtration angle, left hand lower contour,  xy_g_l coordinates x and y of the filtration angle, left hand upper contour,  xy_d_p coordinates x and y of the filtration angle, right hand lower contour,  xy_g_p coordinates x and y of the filtration angle, right hand upper contour,  linie_12 contour lines.

To (Fig. 3-44). ANTERIOR CHAMBER Fig. 3-43 Anterior chamber position in eye cross-section B C 250 D A 200 150 z 50 100 50 0 400 400 200 200 0 0 -200 -200 -400 y Fig. 3-44 Arrangement of individual eye scans. -400 x Fig. 3-45 Contours of external boundary of sclera on scans A and B (Fig. 3-43) ) in a Cartesian coordinate system ANALYSIS OF ANTERIOR EYE SEGMENT To simplify the notation, let us further assume that the function determining necessary contours and the filtration angle will be defined as: [Ls,L22,xy_g_l, xy_d_l, xy_g_p, xy_d_p,linie_12]=OCT_angle_line(Ls); where the OCT image is an input parameter and at the output we obtain, in accordance with the previous section:  xy_d_l coordinates x and y of the filtration angle, left hand lower contour,  xy_g_l coordinates x and y of the filtration angle, left hand upper contour,  xy_d_p coordinates x and y of the filtration angle, right hand lower contour,  xy_g_p coordinates x and y of the filtration angle, right hand upper contour,  linie_12 contour lines.

The input image within approximated boundaries, red – the approximation result ANALYSIS OF ANTERIOR EYE SEGMENT marked blue, and green – the approximation result marked white, respectively. Fig. 3-28 The input image with detected boundaries of anterior eye segment marked red and green Fig. 3-29 OCT image of the anterior eye part with marked analysis area (red and turquoise) The next phases of algorithm operation consist in analysing the area situated under the contour marked red in Fig. 3-28. Because of that it is necessary to draw a straight line normal to the tangent at each point of the contour.

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Atmospheric Electrostatics by Wahlin


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