caa a22 4500 465750842 CHVBK 20180323111833.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF02322821 doi (NATIONALLICENCE)springer-10.1007/BF02322821 Yao Jonathan Washington University, 63130, St. Louis, MO aut Digital image processing and isoclinics [Elektronische Daten] [Jonathan Yao] Isoclinics contain very important information about the direction of principal stresses. Unfortunately, it is frequently found that the isoclinics are vague or vanish altogether in certain regions of a plate. The isoclinic lines representing stress direction and the isochromatic lines representing stress magnitude are superimposed on each other. It is extremely difficult to separate them and to get isoclinics. In 1985, Zhang and Su introduced the TX-1 digital-image-processing system and sought new ideas to track isoclinics. In 1986, Yao developed a new image-division method (IDV) which is easy to apply in the digital image processing techniques to track isoclinics. This paper introduces other new methods: an image-differentiation method (IDF) and an image-division and differentiation method (IDD), and discusses some image-processing techniques. Experiments with a disk in diametral compression and with a slice from a three-dimensional frozen model are used to demonstrate such methods. Society for Experimental Mechanics, Inc., 1990 Experimental Mechanics Kluwer Academic Publishers 30/3(1990-09-01), 264-269 0014-4851 30:3<264 1990 30 11340 https://doi.org/10.1007/BF02322821 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02322821 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Yao Jonathan Washington University, 63130, St. Louis, MO aut NATIONALLICENCE 773 0- Experimental Mechanics Kluwer Academic Publishers 30/3(1990-09-01), 264-269 0014-4851 30:3<264 1990 30 11340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer