Olympus Corporation

Keio University

Nuclear Engineering, Ltd.

Shingo Ando

Masato Nakajima

Masataka Yamada

Satoko Imai

Hirofumi Shintani

Ryuji Murakami

A color type converting meansgenerates, from a primary color image, an intensity image in a hue/saturation/intensity space normalized in a cylindrical coordinate system. A region dividing meansanalyzes the texture of the intensity image and divides the intensity image into a plurality of regions on the basis of the result of the analysis. A density conversion curve generating meansgenerates a density conversion curve for each intensity image by smoothing the histogram for each divided region. A density converting meansexecutes density conversion of the intensity image by using the smoothing a histogram of each region. A region dividing meansgenerates a primary color image by using the intensity image which is density-converted.

Color image processing method and apparatus

A gamma-rays measurement method of radionucludes (iodine-131, cobalt-60, etc.) coexisting with radionuclides (nitrogen-13, fluorine-18, cobalt-58, etc.) each emitting a pair of annihilation gamma-rays, particularly in primary water of a nuclear reactor by the use of a gamma-ray spectrometric system which includes a primary detector for detecting the gamma-rays and the one annihilation gamma-rays as pulses, a secondary detector for detecting the other annihilation gamma-rays as pulses, and shield detector for detecting gamma-rays Compton-scattered and escaped from the primary to shield detectors as pulses. The method comprises counting the pulses of the secondary detector in anticoincidence with the pulses of the primary detector, thereby to reject the recording of the annihilation gamma-rays from the primary detector, thus minimizing the annihilation gamma-rays disturbing to the measurement, followed by determining count numbers of the gamma-rays. Detection limits of the gamma-rays can be elevated significantly thereby. Simultaneously, further anticoincidence counting of the shield detector with the primary detector can be conducted to diminish the Compton-scattered gamma-rays.

Method for measuring gamma-rays of radionuclides, particularly in

Growing community of inventors

Kanagawa, Japan

Shingo Ando