Abstract: The non-interferometric phase retrieval technique based on the transport of intensity equation (TIE) is employed to calculate the missing phase information from the intensity measurement. However, since the limiting effect of the lens aperture is existed in the actual imaging system, a certain effect on the resolution of the recovery phase is under consideration. In this paper, the concept of tilted illumination is introduced into the phase retrieval based on the TIE, the modulation function is loaded on the spatially modulated light (SLM), and the plane wave accompanies with various different wave vectors oblique impinging onto an object, then the pass band of the lens aperture cover the frequency spaces with different parts. Summing the fields covered by these shifted passbands yields, and obtain a synthesized field with an enlargened passband, which improve the imaging ability of the system in the field of high frequencies. At the same time, the multi-angle tilt light modulation system based on 4f and single lens is constructed, and the better phase results are obtained by the measured intensity images combined with the TIE. The experimental results show that the proposed method can improve the resolution of recovery phase without compromising the numerical error of the recovery results.

Key words: headrelated transfer function, independent component analysis, median-plane spectrum, sound reproduction