1980
DOI: 10.1364/ao.19.003396
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Hills and valleys analysis in optical mapping and its application to moiré contouring

Abstract: The information content of a contour map is calculated and compared with the information required for determining the relative position of the contours. We have found that usually the information required for arranging the contours in the right order is small as compared with that of producing the map. To demonstrate this finding we introduce two novel methods for ordering the contours. The first makes use of two colors, double exposure, moire mapping. The second analyzes the relative motion of hills and valle… Show more

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Cited by 17 publications
(4 citation statements)
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“…In 1980 A. Livnat, O. Kafri, and G. Erez defined and analyzed the so called "hill or valley" issue, caused by the ambiguity in the surface direction using the conventional black and white moiré gratings. 13 In 1992 K. Wenzel solved this problem by applying a bicolor projection grating. 14 The color sequence formed by the moiré fringes defines the direction of the surface unequivocally.…”
Section: Moiré Techniquementioning
confidence: 99%
“…In 1980 A. Livnat, O. Kafri, and G. Erez defined and analyzed the so called "hill or valley" issue, caused by the ambiguity in the surface direction using the conventional black and white moiré gratings. 13 In 1992 K. Wenzel solved this problem by applying a bicolor projection grating. 14 The color sequence formed by the moiré fringes defines the direction of the surface unequivocally.…”
Section: Moiré Techniquementioning
confidence: 99%
“…The fringe carrier method is restricted by its carrier fringe frequency. Several methods with application of colour to moiré methods have been already proposed [6], [7], [8]. However the main disadvantage of the earlier presented methods is complication of mechanical and/or analyzing process.…”
Section: Introductionmentioning
confidence: 99%
“…Η διπλή έκθεση με περισσότερες πηγές ή με σχετική μετακίνηση της πηγής ως προς το φακό αποτέλεσε ακόμα μιά εκδοχή (Takasaki, 1979). Πιό εξεζητημένες μέθοδοι χρησιμοποίησαν φίλτρα, έγχρωμο φιλμ και φωτισμό (Livnat et al, 1980) ή ακόμα και έγχρωμα πλέγματα (Honda et al, 1976 / Eschbach andBryngdahl, 1983).…”
Section: το ζήτημα της φοράς του ανάγλυφουunclassified
“…Για τη μέθοδο της προβολής έχουν αναπτυχθεί ανάλογες μέθοδοι μέ ειδικά ασυνεχή πλέγματα προβολής (Benoit et al, 1975) και με σχετική στροφή ή μετατόπιση των δυό πλεγμάτων κατά την υπέρθεση τους (Miles and Speight, 1975/ Livnat et al, 1980/ Roger et al, 1981 στην περίπτωση της εκ των υστέρων δημιουργίας των κροσσών που αναφέρθηκε σε προηγούμενη ενότητα.…”
Section: το ζήτημα της φοράς του ανάγλυφουunclassified