发明名称 |
X-ray apparatus |
摘要 |
An X-ray apparatus includes a pixel-extracting section for extracting pixels determined in advance in each line of an image containing a grid moiré pattern, a FFT processing section for performing one-dimensional FFT to the extracted pixels, a peak-frequency detecting section for detecting a peak frequency from a frequency characteristic for each line having undergone FTT, a frequency-characteristic preparing section for preparing a frequency characteristic for extracting the grid moiré pattern in accordance with the detected peak-frequency, an inverse FFT processing section for performing inverse FFT to the frequency characteristic prepared by the frequency-characteristic preparing section, and an FIR filtering section for performing FIR filtering on the image with use of a value calculated by the inverse FFT processing section as an FIR filter coefficient. |
申请公布号 |
US8897418(B2) |
申请公布日期 |
2014.11.25 |
申请号 |
US201213586241 |
申请日期 |
2012.08.15 |
申请人 |
Shimadzu Corporation |
发明人 |
Hasegawa Naoki |
分类号 |
H05G1/64;H04N5/32;G01N23/04 |
主分类号 |
H05G1/64 |
代理机构 |
McDermott Will & Emery LLP |
代理人 |
McDermott Will & Emery LLP |
主权项 |
1. An X-ray apparatus with an X-ray irradiation section for irradiating a subject with X-rays, an X-ray detector for detecting X-rays transmitting through the subject, and an X-ray grid disposed on an incidence surface side of the X-ray detector for removing scattered rays, comprising:
a pixel-extracting section for extracting pixels determined in advance in each line perpendicular to a grid moiré pattern of an image, the grid moiré pattern by the X-ray grid being contained in the image; a Fast Fourier Transform processing section for performing one-dimensional Fast Fourier Transform to the pixels extracted by the pixel-extracting section; a peak-frequency detecting section for detecting a peak frequency from a frequency characteristic for each line calculated by the Fast Fourier Transform processing section, the peak frequency being a frequency component of the grid moiré pattern; a frequency-characteristic preparing section for preparing a frequency characteristic for extracting a grid moiré pattern image in accordance with the peak-frequency; an inverse Fast Fourier Transform processing section for performing inverse Fast Fourier Transform to the frequency characteristic prepared by the frequency-characteristic preparing section; and an FIR filtering section for performing FIR filtering on the image with use of a value calculated by the inverse Fast Fourier Transform processing section as an FIR filter coefficient. |
地址 |
Kyoto JP |