Image processing apparatus, image processing method, radiation imaging apparatus, and storage medium
AssigneeCanon Kabushiki Kaisha
InventorNaoto Takahashi
Life of this patent
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Abstract
An image processing apparatus that processes a radiation image captured using a grid for scattered radiation reduction includes a conversion unit configured to convert a frequency spectrum of a signal of a fundamental wave of the grid into a frequency spectrum of an n-th harmonic where n is an integer greater than 1, and a reduction unit configured to acquire a reduction image obtained by reducing the n-th harmonic in the radiation image, using an intensity of the signal obtained by the conversion.
Claims8
An image processing apparatus that processes a radiation image captured using a grid for scattered radiation reduction, the image processing apparatus comprising:
- at least one memory storing a program;
- and
- at least one processor that executes the stored program, which causes the at least one processor to:
- convert a frequency spectrum of a signal of a fundamental wave of the grid into a frequency spectrum of an n-th harmonic so that in a case where a frequency of a peak of the fundamental wave of the grid is fg and a frequency of a peak of the n-th harmonic of the grid is fgn, the frequency fg of the peak of the fundamental wave is the frequency fgn, where n is an integer greater than 1;
- and
- acquire a reduction image obtained by reducing the n-th harmonic in the radiation image, using an intensity of the signal obtained by the conversion.
An image processing method, performed by a processor executing a program stored in a non-transitory computer-readable storage medium, for processing a radiation image captured using a grid for scattered radiation reduction, the image processing method comprising:
- converting, by the processor, a frequency spectrum of a signal of a fundamental wave of the grid into a frequency spectrum of an n-th harmonic so that in a case where a frequency of a peak of the fundamental wave of the grid is fg and a frequency of a peak of the n-th harmonic of the grid is fgn, the frequency fg of the peak of the fundamental wave is the frequency fgn, where n is an integer greater than 1;
- and
- acquiring, by the processor, a reduction image obtained by reducing the n-th harmonic in the radiation image, using an intensity of a signal obtained by the conversion.
Dependencies are inferred from the claim text.