Real-time image subtraction using phase reversal technique

Vuyyuru Venkateswara Rao; Nandigana K. Krishna Mohan

doi:10.1117/12.365748

13 October 1999 Real-time image subtraction using phase reversal technique

Vuyyuru Venkateswara Rao, Nandigana K. Krishna Mohan

Proceedings Volume 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids; (1999) https://doi.org/10.1117/12.365748
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A simple coherent interferometric processing method for image subtraction in real-time is presented. The proposed method is based on interferometric principle using Mach- Zehnder interferometer. The phase reversal is accomplished by varying the pressure within an air-filled quartz cell inserted in one of the arms of the interferometer. Initially, the interferometer is aligned to obtain broad interference fringes in the cell region. Then the input imageries are introduced in both the arms of the interferometer and adjusted for exact registration as seen in the plane of observation. By introducing a phase change of (pi) -rad between the two arms of the interferometer, the difference between the inputs is detected in real-time on the monitor. Phase shift calibration and information processing of the proposed method is presented with the results.

Citation Download Citation

Vuyyuru Venkateswara Rao and Nandigana K. Krishna Mohan "Real-time image subtraction using phase reversal technique", Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, (13 October 1999); https://doi.org/10.1117/12.365748

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