Tampere University of Technology

TUTCRIS Research Portal

Multiwavelength surface contouring from phase-coded diffraction patterns

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationUnconventional Optical Imaging 2018. Strasbourg, France
ISBN (Print)978-1-5106-1880-0
Publication statusPublished - 1 Jan 2018
Publication typeA4 Article in a conference publication
EventUnconventional Optical Imaging -
Duration: 1 Jan 2000 → …

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Electronic)0277-786X


ConferenceUnconventional Optical Imaging
Period1/01/00 → …


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.


  • absolute phase retrieval, discrete optical signal processing, Multiwavelength phase retrieval, phase imaging, surface contouring

Publication forum classification

Field of science, Statistics Finland