US 12,250,473 B2
Method and system of swept coded aperture real-time femtophotography
Jinyang Liang, Boucherville (CA); François Légaré, Saint-Eustache (CA); Jingdan Liu, Longueuil (CA); Heide Ibrahim, Montreal (CA); Xianglei Liu, Longueuil (CA); and Yingming Lai, Longueuil (CA)
Assigned to INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Quebec (CA)
Filed by INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE490, Quebec (CA)
Filed on Feb. 17, 2023, as Appl. No. 18/170,887.
Claims priority of provisional application 63/268,938, filed on Mar. 7, 2022.
Prior Publication US 2023/0283917 A1, Sep. 7, 2023
Int. Cl. H04N 23/95 (2023.01); H04N 23/12 (2023.01); H04N 23/56 (2023.01)
CPC H04N 23/95 (2023.01) [H04N 23/12 (2023.01); H04N 23/56 (2023.01)] 15 Claims
OG exemplary drawing
 
1. A method for imaging of a dynamic scene, comprising data acquisition and image reconstruction from acquired data;
said data acquisition comprising imaging the scene using a single chirped pulse; time-spectrum mapping (M) when the single chirped pulse probes the dynamic scene and storing temporal information at different wavelengths, spectral shearing, spatial encoder and reverse spectral shearing; and spatiotemporal integration; and
said image reconstruction comprising processing a resulting captured snapshot by a computer;
yielding an image of the dynamic scene; by:
illuminating the scene with a single ultrafast probe pulse from a laser; a first spectral shearing(S) of the dynamics scene; spatial encoder (C), a second spectral shearing in a reverse direction (S′); and spatiotemporal integration of a resulting spatially encoded dynamic scene, yielding a captured snapshot E[m,n] linked with transmittance modulated by the dynamic scene a(x,y,t) as follows: E[m,n]=O a(x,y,t), (x,y,t) being a datacube of the dynamic scene, T being an exposure time, m and n being pixel indices of a detector, and O an operator O=TS′CSM.