Ring Image Analyzer
- Created on Sunday, 01 January 2012
Ring Image Analyzer software analyzes images to recognize elliptical patterns. It determines the ellipse parameters (axes ratio, centroid coordinate, tilt angle). The program attempts to recognize elliptical fringes (e.g., Newton Rings) on a photograph and determine their centroid position, the short-to-long-axis ratio, and the angle of rotation of the long axis relative to the horizontal direction on the photograph. These capabilities are important in interferometric imaging and control of surfaces. In particular, this program has been developed and applied for determining the rim shape of precisionmachined optical whispering gallery mode resonators.
The program relies on a unique image
recognition algorithm aimed at recognizing
elliptical shapes, but can be easily
adapted to other geometric shapes. It is
robust against non-elliptical details of the
image and against noise.
Interferometric analysis of precisionmachined surfaces remains an important technological instrument in hardware development and quality analysis. This software automates and increases the accuracy of this technique. The software has been developed for the needs of an R&TD-funded project and has become an important asset for the future research proposal to NASA as well as other agencies.
This work was done by Dmitry V. Strekalov of Caltech for NASA’s Jet Propulsion Laboratory.
This Brief includes a Technical Support Package (TSP).
Ring Image Analyzer (reference ) is currently available for download from the TSP library.
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