Camera-array Fourier ptychography with speckle suppression for reflective macroscopic imaging

Reflective macroscopic Fourier ptychography enables synthetic-aperture high-resolution imaging of opaque and diffuse objects, but its practical performance is limited by inefficient single-camera scanning and speckle-induced inter-frame measurement inconsistency under coherent illumination. In this work, we present a camera-array Fourier ptychographic method with speckle suppression for reflective macroscopic imaging, which combines parallel sub-aperture acquisition with reconstruction guided by frequency-selective statistical consistency. On the acquisition side, a four-camera array reduces the number of mechanical scan positions from 169 to 49 under the same effective spatial-frequency coverage. On the reconstruction side, statistically consistent amplitude projection and frequency-selective residual fusion suppress frame-dependent speckle fluctuations while preserving high-frequency details. Experiments on a reflective USAF resolution object show that the proposed method increases the resolvable spatial frequency from 2.52 lp/mm to 8.98 lp/mm and reduces the mean speckle contrast from 0.763 ± 0.087 to 0.140 ± 0.048. Compared with standard ePIE and ePIE followed by BM3D post-filtering, the proposed method better preserves high-frequency details while suppressing speckle. Experiments on metallic and paper-based reflective objects further demonstrate its applicability to practical reflective surfaces.