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1. (WO1991018357) IMAGING METHOD AND USES OF SAME
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/018357 International Application No.: PCT/FI1991/000161
Publication Date: 28.11.1991 International Filing Date: 23.05.1991
Chapter 2 Demand Filed: 30.10.1991
IPC:
G01T 1/29 (2006.01) ,G09C 5/00 (2006.01)
G PHYSICS
01
MEASURING; TESTING
T
MEASUREMENT OF NUCLEAR OR X-RADIATION
1
Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
29
Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
G PHYSICS
09
EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
C
CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
5
Ciphering or deciphering apparatus or methods not provided for in other groups of this subclass, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages
Applicants:
VALTION TEKNILLINEN TUTKIMUSKESKUS [FI/FI]; Vuorimiehentie 5 SF-02150 Espoo, FI (AllExceptUS)
HIISMÄKI, Pekka [FI/FI]; FI (UsOnly)
Inventors:
HIISMÄKI, Pekka; FI
Agent:
FORSSÉN & SALOMAA OY; Uudenmaankatu 40 A SF-00120 Helsinki, FI
Priority Data:
90260024.05.1990FI
Title (EN) IMAGING METHOD AND USES OF SAME
(FR) PROCEDE DE FORMATION D'IMAGE ET APPLICATIONS DU PROCEDE
Abstract:
(EN) An imaging method for forming a bidimensional image of a self-radiating object (O) or of an object that is selectively penetrable by radiation. In the method, a discrete aperture is employed which has an area wider than a spot-like aperture and which consists of a finite number of pixels belonging to the same periodic lattice, the radiation used for the imaging being confined to pass through said aperture. In the aperture, an exchangeable series of masks is installed, so that, of the object, a pseudo-image is stored per each component code. The image of the object (O) is synthesized out of said pseudo-images by means of a decoding algorithm. By means of the masks, the radiation field that passes through the aperture is modulated in accordance with the component codes of the CV codes in accordance with the present invention defined for the L-pixel discrete aperture.
(FR) Procédé de formation d'image servant à obtenir une image bidimensionnelle d'un objet à auto-rayonnement (D) ou d'un objet que le rayonnement peut pénétrer sélectivement. Dans le procédé, on utilise une ouverture discrète possédant une surface plus grande qu'une ouverture sous forme de point et qui consiste en un nombre fini de pixels appartenant au même réseau périodique, le rayonnement utilisé pour la formation d'image étant contraint de passer par ladite ouverture. On installe une série interchangeable de masques dans l'ouverture afin de mémoriser une pseudo-image de l'objet pour chaque code de composant. L'image de l'objet (O) est synthétisée à partir desdites pseudo-images au moyen d'un algorithme de décodage. Au moyen des masques, le champ de rayonnement qui passe par l'ouverture est modulé en fonction des codes constitutifs des codes CV définis pour l'ouverture discrète de L-pixels, selon la présente invention.
Designated States: JP, SU, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)