US 10,891,716 B2
Process allowing the removal through digital refocusing of fixed-pattern noise in effective images formed by electromagnetic sensor arrays in a light field
Carlos Saavedra Rubilar, Concepcion (CL); Sergio Neftali Torres Inostroza, Concepcion (CL); Pablo Antonio Coelho Caro, Concepcion (CL); Jorge Eduardo Tapia Farias, Concepcion (CL); and Francisco German Perez Venegas, Concepcion (CL)
Assigned to UNIVERSIDAD DE CONCEPCION, Concepcion (CL)
Appl. No. 15/780,135
Filed by UNIVERSIDAD DE CONCEPCION, Concepcion (CL)
PCT Filed Aug. 25, 2016, PCT No. PCT/CL2016/000049
§ 371(c)(1), (2) Date May 30, 2018,
PCT Pub. No. WO2017/091914, PCT Pub. Date Jun. 8, 2017.
Claims priority of application No. 3495-2015 (CL), filed on Nov. 30, 2015.
Prior Publication US 2018/0365806 A1, Dec. 20, 2018
Int. Cl. G06K 9/40 (2006.01); G06T 5/00 (2006.01); H04N 5/365 (2011.01); G06T 7/557 (2017.01); G06T 5/10 (2006.01)
CPC G06T 5/002 (2013.01) [G06T 5/10 (2013.01); G06T 7/557 (2017.01); H04N 5/365 (2013.01); G06T 2207/10048 (2013.01); G06T 2207/10052 (2013.01); G06T 2207/20182 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A process for removal of fixed-pattern noise in images formed by electromagnetic sensor arrays in a light field, comprising the following steps:
a. forming a digital image from an electromagnetic sensor array;
b. forming a light field defined as an image matrix having a plurality of at least 2×2 digital images of a scene, wherein each digital image of the matrix has a separation distance of at least a size of an effective area of an electromagnetic sensor which is built up through a single array of electromagnetic sensors and multiple focusing systems of electromagnetic radiation; and
c. reconstructing an image by means of digital refocusing from the light field on two different refocus planes, a first plane being a near focal plane and a second plane being a far plane corresponding to an infinity, and by converting spatial information of the light field to information in frequency space using a digital refocusing algorithm where noise is progressively eliminated as the refocus planes are brought closer together with respect to an observer.