NearFieldPtychographyGeometry

class deepinv.physics.NearFieldPtychographyGeometry(wavelength, object_detector_distance, detector_shape, detector_pixel_size)

Bases: PtychographyGeometry

Near-field ptychography geometry using same-grid propagation.

Fresnel transfer-function and angular-spectrum propagation keep the sampling grid, so the object-plane pixel size equals the detector pixel size, \(\Delta_o = \Delta_d\).

Parameters:

• wavelength (float) – Illumination wavelength \(\lambda\), in metres.

• object_detector_distance (float) – Object-to-detector propagation distance \(z\), in metres.

• detector_shape (tuple[int, int]) – Number of detector pixels (height, width).

• detector_pixel_size (tuple[float, float]) – Effective detector pixel size (dy, dx) \(\Delta_d\), in metres, equal to the object-plane pixel size.