High-speed subpixel image sensing technique and its applications

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1. A high-accuracy image matching technique using Phase-Only Correlation (POC) function was developed. The newly developed technique can improve matching performance by fitting the closed-form analytical model of the correlation peak to actual two-dimensional numerical data. This technique can also be extended to a spectrum weighting POC technique, where we modify cross-phase spectrum with some weighting functions to enhance registration accuracy. We provided systematic experimental analysis of the matching performance of the proposed technique by evaluating the errors in estimating the translational displacements, the rotation angle and the scale factor.2. Some applications of the POC-based image matching/registration technique to (i) high-accuracy scale estimation for electron microscopes, (ii) high-accuracy measurement for metal component inspection, (iii) super-resolution processing for video sequences, (iv) high-quality background sprite generation, (v) video object segmentation, and (vi) fingerprint/3D face recognition were studied.3. System implementation techniques were investigated for developing the above applications. We studied the implementation of the application (i) on a general-purpose processor since it handles only 2D still images. On the other hand, we studied the implementations of the applications (ii)-(vi) on a digital signal processor and specific hardware.