US 12,306,045 B2
Image capture using radiation-sensitive elements having a memory effect
Jean-Claude Krapez, Pelissanne (FR)
Assigned to OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES, Palaiseau (FR)
Appl. No. 17/779,956
Filed by OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES, Palaiseau (FR)
PCT Filed Nov. 14, 2020, PCT No. PCT/EP2020/082167
§ 371(c)(1), (2) Date May 25, 2022,
PCT Pub. No. WO2021/104905, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 1913415 (FR), filed on Nov. 28, 2019.
Prior Publication US 2023/0010469 A1, Jan. 12, 2023
Int. Cl. G01J 5/10 (2006.01); G01J 5/08 (2022.01); H04N 23/23 (2023.01); H04N 25/626 (2023.01); H04N 25/76 (2023.01); G01J 5/00 (2022.01)
CPC G01J 5/10 (2013.01) [G01J 5/0853 (2013.01); H04N 23/23 (2023.01); H04N 25/626 (2023.01); H04N 25/76 (2023.01); G01J 2005/0077 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for capturing images, the method comprising:
successively capturing a plurality of images using a same matrix of sensitive elements, each of the sensitive elements exhibiting a memory effect which makes a raw detection signal of said sensitive element depend on an amount of radiation received by said sensitive element at a read-out time at which the raw detection signal is read and depend on amounts of radiation received by said sensitive element before said read-out time; and
separately assigning an image point intensity value to each of the sensitive elements of the matrix to form a corrected image which is at least partially corrected for the memory effect, said image point intensity value being proportional to a difference between the raw detection signal of the sensitive element as read for a new raw image that is captured, and a part of the raw detection signal of the same sensitive element as read for a prior raw image, which was captured before said new raw image was captured,
wherein the image point intensity value which is attributed to each of the sensitive elements in order to form the corrected image is proportional to a result of dividing by [1−exp(−Δ/τ)] a difference between the raw detection signal of the sensitive element as read for the new raw image, and the result of multiplying by exp(−Δ/τ) the raw detection signal of the same sensitive element as read for the prior raw image, where exp(.) designates an exponential function, τ is a characteristic response time of the sensitive element, and Δ is a non-zero duration between the read-out times of said sensitive element respectively for the new raw image and the prior raw image.