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1. (WO2018178104) METHOD AND DEVICE FOR ACQUIRING AND RESTORING DIGITAL IMAGES WITH EXTENDED DYNAMICS
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Pub. No.: WO/2018/178104 International Application No.: PCT/EP2018/057822
Publication Date: 04.10.2018 International Filing Date: 27.03.2018
IPC:
H04N 5/335 (2011.01) ,H04N 5/225 (2006.01) ,H04N 5/235 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
5
Details of television systems
30
Transforming light or analogous information into electric information
335
using solid-state image sensors [SSIS]
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
5
Details of television systems
222
Studio circuitry; Studio devices; Studio equipment
225
Television cameras
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
5
Details of television systems
222
Studio circuitry; Studio devices; Studio equipment
225
Television cameras
235
Circuitry for compensating for variation in the brightness of the object
Applicants: CENTRE NATIONAL D'ETUDES SPATIALES[FR/FR]; 2, Place Maurice Quentin 75001 PARIS, FR
Inventors: TOULEMONT, Arthur; FR
Priority Data:
17 5269930.03.2017FR
Title (EN) METHOD AND DEVICE FOR ACQUIRING AND RESTORING DIGITAL IMAGES WITH EXTENDED DYNAMICS
(FR) PROCÉDÉ ET DISPOSITIF D'ACQUISITION ET DE RESTITUTION D'IMAGES NUMÉRIQUES AVEC UNE DYNAMIQUE ÉTENDUE
Abstract:
(EN) The invention concerns a method for acquiring digital images with an extended dynamic range and an associated method for restoring digital images, as well as corresponding devices. The method for acquiring digital images comprises steps of: - determining (30) a plurality of different integration times, - and for each of the determined integration times, obtaining (32) an initial digital image acquired with the integration time, each initial digital image having a corresponding signal level, - for each initial digital image, applying (34) a clipping function with an associated clipping threshold to obtain a linear signal level according to the lighting, to obtain a processed digital image, and - combining (36) processed digital images to obtain a final image with extended dynamic range, said combination comprising a summation of the signals of the processed digital images, the final image having a linear signal level by fragments according to the lighting.
(FR) L'invention concerne un procédé d'acquisition d'images numériques avec une gamme dynamique étendue et un procédé de restitution d'images numériques associé, ainsi que des dispositifs correspondant. Le procédé d'acquisition d'images numériques comporte des étapes de : -détermination (30) d'une pluralité de temps d'intégration différents, -et pour chacun des temps d'intégration déterminés, obtention (32) d'une image numérique initiale acquise avec ledit temps d'intégration, chaque image numérique initiale ayant un niveau de signal correspondant, -pour chaque image numérique initiale, application (34) d'une fonction d'écrêtage avec un seuil d'écrêtage associé pour obtenir un niveau de signal linéaire en fonction de l'éclairement, pour obtenir une image numérique traitée, et -combinaison (36) des images numériques traitées pour obtenir une image finale de gamme dynamique étendue, ladite combinaison comportant une sommation des signaux d'images numériques traités, l'image finale ayant un niveau de signal linéaire par morceaux en fonction de l'éclairement.
front page image
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: French (FR)
Filing Language: French (FR)