Abstract: To provide a system, a method, and a program whereby a reconstructed image supported by an algebraically exact solution of an inverse discrete Radon transform can be generated using fewer computational resources, and a recording medium in which the program is recorded.

Abstract: A virtual space sharing system 1 for causing a first moving body 10 and a second moving body 12 is disclosed. The virtual space sharing system includes: a virtual space display unit 20, 22; a delay time measurement unit 30 that measures a communication delay time between the first moving body 10 and the second moving body 12; a motion prediction unit 40 and the second moving body 12; and a display control unit 50 that displays, on the virtual space display unit 20, 22, a motion of the first moving body 10 predicted by the motion prediction unit 40 to be occurring at a point of time into the future by the communication delay time and a motion of the second moving body 12 predicted by the motion prediction unit 40 to be occurring at a point of time into the future by the communication delay time.

Abstract: An improved image processing apparatus and the like using visual recognition of a vertebrate such as a human being are provided. The image processing apparatus includes an image acquisition unit for acquiring an image, a first image processing unit for performing first image processing on the acquired image, and including a first sampling unit for performing first sampling for extracting at least one sample to be processed from the acquired image, and a color detection unit for detecting colors of the at least one extracted sample, and a second image processing unit for performing second image processing different from the first image processing on the acquired image, and including a second sampling unit for performing second sampling for extracting at least one sample to be processed from the acquired image, and a color reduction unit for reducing the colors of the at least one extracted sample.

Abstract: In order to increase reproducibility of a reconstructed tomographic image without increasing the computational load, detection is performed by oversampling in (N+n) directions during imaging for detection by N detection elements. A vector having N×(N+n) elements is obtained, and vector decimation step is performed in which a total of n×N elements corresponding to a sequence {k} 30 denoting a decimation order are removed. In a discrete Radon transform step, a corresponding discrete Radon inverse matrix WSQ?140 is operated, and in an image data generation step, de-vectoring is performed, thereby tomographic image data are acquired. When oversampling is used, a discrete Radon inverse matrix WSQ?1 is obtained. Therefore, a tomographic image is obtained by matrix computation without resorting to iterative approximation.

Abstract: In a measurement unit, a primary acceleration sensor is fixed at the center of gravity of a flying object or at a position within a certain error range from the center of gravity. A secondary acceleration sensor is fixed inside the flying object so as to be spaced from the center of gravity of the flying object. In a measurement apparatus, an acquirer acquires a primary acceleration measured by the primary acceleration sensor during flight of the flying object and a secondary acceleration measured by the secondary acceleration sensor during the flight of the flying object. An estimator estimates a spin rate per unit time of the flying object from the acquired primary acceleration and the acquired secondary acceleration using maximum likelihood estimation.

Abstract: In order to increase reproducibility of a reconstructed tomographic image without increasing the computational load, detection is performed by oversampling in (N+n) directions during imaging for detection by N detection elements. A vector having N×(N+n) elements is obtained, and vector decimation step is performed in which a total of n×N elements corresponding to a sequence {k} 30 denoting a decimation order are removed. In a discrete Radon transform step, a corresponding discrete Radon inverse matrix WSQ?140 is operated, and in an image data generation step, de-vectoring is performed, thereby tomographic image data are acquired. When oversampling is used, a discrete Radon inverse matrix WSQ?1 is obtained. Therefore, a tomographic image is obtained by matrix computation without resorting to iterative approximation.

Abstract: In a measurement unit, a primary acceleration sensor is fixed at the center of gravity of a flying object or at a position within a certain error range from the center of gravity. A secondary acceleration sensor is fixed inside the flying object so as to be spaced from the center of gravity of the flying object. In a measurement apparatus, an acquirer acquires a primary acceleration measured by the primary acceleration sensor during flight of the flying object and a secondary acceleration measured by the secondary acceleration sensor during the flight of the flying object. An estimator estimates a spin rate per unit time of the flying object from the acquired primary acceleration and the acquired secondary acceleration using maximum likelihood estimation.

Abstract: To measure three-dimensional dose distributions with a dosimeter, such as a gel dosimeter. In an embodiment of the present invention, provided is a gel dosimeter having water, as solvent or disperse medium, clay particles that swell with water, and recording material precursor, which are dissolved or dispersed with each other. The recording material precursor has an atom or ion, wherein the atom or ion changes its valence number by reacting with both of a radical and a molecular radical derivative. The radical is to be generated from the water ionized by irradiation of radiation rays, and the molecular radical derivative is a molecule to be formed by bonding the radicals with each other. By the time radiation rays are irradiated, the gel dosimeter has been free from a substance identical to the molecular radical derivative and has lost fluidity.

Abstract: To measure three-dimensional dose distributions with a dosimeter, such as a gel dosimeter. In an embodiment of the present invention, provided is a gel dosimeter having water, as solvent or disperse medium, clay particles that swell with water, and recording material precursor, which are dissolved or dispersed with each other. The recording material precursor has an atom or ion, wherein the atom or ion changes its valence number by reacting with both of a radical and a molecular radical derivative. The radical is to be generated from the water ionized by irradiation of radiation rays, and the molecular radical derivative is a molecule to be formed by bonding the radicals with each other. By the time radiation rays are irradiated, the gel dosimeter has been free from a substance identical to the molecular radical derivative and has lost fluidity.