Frequency guided methods for demodulation of a single fringe pattern with quadratic phase matching

► A quadratic phase matching and frequency-guided regularized phase tracker (QFGRPT) and a quadratic phase matching and frequency-guided sequential demodulation (QFSD) are proposed for single fringe pattern demodulation. ► Quadratic phase matching improves the accuracy of the demodulation. ► The size of the matching window for quadratic phase is more flexible than linear phase, where only small window can be used. ► The frequency guided scanning strategy improves the robustness of the demodulation.