An imroved image demodulation algorithm based on Teager-Kaiser operator

In this paper a new wideband image demodulation algorithm based on the Teager-Kaiser operator is proposed. A Gabor filter bank is first used to decompose the wideband image into multiple narrow band components. Directly applied on these components, the demodulation yields many artifacts on both the amplitude and the frequency modulation counterparts. To reduce these artifacts, a low-pass filter in the demodulation process is introduced. An approximation of the Teager-Kaiser filtered image energy is proposed. A proposition related to that fact, along with the associated proof are provided. As illustrated by various examples, our demodulation approach is more robust to noise, and drastically improves the visual quality of the demodulation results. A direct consequence post-filtering or/and post-processing are not necessary.