Multiwavelength surface contouring from phase-coded diffraction patterns
Katkovnik, Vladimir; Shevkunov, Igor; Petrov, Nikolay V.; Eguiazarian, Karen (2018-01-01)
Katkovnik, Vladimir
Shevkunov, Igor
Petrov, Nikolay V.
Eguiazarian, Karen
SPIE
01.01.2018
Unconventional Optical Imaging 2018. Strasbourg, France
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202001231493
https://urn.fi/URN:NBN:fi:tuni-202001231493
Kuvaus
Peer reviewed
Tiivistelmä
We propose a new algorithm for absolute phase retrieval from multiwavelength noisy phase coded diffraction patterns in the task of surface contouring. A lensless optical setup is considered with a set of successive single wavelength experiments. The phase masks are applied for modulation of the multiwavelength object wavefronts. The algorithm uses the forward and backward propagation for coherent light beams and sparsely encoding wavefronts which leads to the complex-domain block-matching 3D filtering. The key-element of the algorithm is an original aggregation of the multiwavelength object wavefronts for high-dynamic-range profile measurement. Numerical experiments demonstrate that the developed approach leads to the effective solutions explicitly using the sparsity for noise suppression and high-accuracy object profile reconstruction.
Kokoelmat
- TUNICRIS-julkaisut [16726]