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- W2060365081 abstract "Study of strata movement and geological discontinuities of rock surfaces in and around mining excavations is of prime importance to optimize safety, production, and productivity. The dynamic nature of the heterogeneous rock mass creates dangerous conditions so a fast remote measuring system having the capability of providing dense amounts of information may be suitable for such measurements. The real time measuring potential of CCD based digital photogrammetry is one of the best options for such a situation but the large depth of field in the object space and the lack of sufficient features on the surface of sedimentary rocks creates serious problems for conventional stereomatchers during automatic measurement. Diode laser based active triangulation is used to solve the correspondence problem but a number of practical problems arose during the design of a portable digital photogrammetric system for mining measurement. This paper addresses these problems with their possible solutions along with the initial results of the proposed measuring system. Subpixel target/features location is a prerequisite criteria for precise photogrammetric measurements from CCD images. A template matching technique is well suited for subpixel centroid location of measuring points in a textured image but it failed to provide the required level of accuracy for such images of physical model sude to changing textures of different off-the-shelf available measuring points." @default.
- W2060365081 created "2016-06-24" @default.
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- W2060365081 date "1995-09-13" @default.
- W2060365081 modified "2023-09-23" @default.
- W2060365081 title "<title>CCD-based active triangulation for rock surface measurement</title>" @default.
- W2060365081 doi "https://doi.org/10.1117/12.220904" @default.
- W2060365081 hasPublicationYear "1995" @default.
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