Image processing apparatus, image processing method, and program
AssigneeCanon Kabushiki Kaisha
InventorTakeshi Noda
Life of this patent
Estimating the term…
Abstract
Even in a case where radiation imaging is performed using a grid, data lack which occurs at a time of radiation detection is appropriately corrected. An FPD controller 105 obtains data of an image captured by detecting radial rays. A data lack ratio calculation unit 111 calculates data lack ratios in the image data. A fitting unit 112 performs fitting so that a model function representing the data lack fits the data lack ratios. A correction processing unit 113 corrects the image data in accordance with the model function obtained by the fitting.
Claims12
An image processing apparatus comprising:
- a CPU;
- and
- at least one memory, the CPU and the at least one memory cooperating to provide:
- an obtaining unit configured to obtain image data captured by detecting radial rays via a grid disposed in front of a radiation detector while resetting odd-numbered lines or even-numbered lines of the radiation detector;
- a calculating unit configured to calculate data lack information of the image data including grid components caused by the grid from a start of radial rays by an irradiating unit to detection of the radial rays by the obtaining unit, by calculating ratios of pixels in which data lack occurs in odd-numbered lines or even-numbered lines to pixels in which data lack does not occur using adjacent lines that are normal, wherein the data lack occurs in odd-numbered lines or even-numbered lines by resetting the odd-numbered lines or the even-numbered lines of the radiation detector;
- a fitting unit configured to fit a model function representing data lack to the data lack information;
- and
- a correcting unit configured to correct the image data using data lack information obtained by reducing grid components in accordance with the model function subjected to the fitting performed by the fitting unit.
An image processing method executed by an image processing apparatus, the image processing method comprising:
- an obtaining step of using an obtaining device to obtain image data captured by detecting radial rays via a grid disposed in front of a radiation detector while resetting odd-numbered lines or even-numbered lines of the radiation detector;
- a calculating step of calculating data lack information of the image data including grid components caused by the grid from a start of a radial rays to detection of the radial rays by the obtaining device, by calculating ratios of pixels in which data lack occurs in odd-numbered lines or even-numbered lines to pixels in which data lack does not occur using adjacent lines that are normal, wherein the data lack occurs in odd-numbered lines or even-numbered lines by resetting the odd-numbered lines or the even-numbered lines of the radiation detector;
- a fitting step of fitting a model function representing data lack to the data lack information;
- and
- a correcting step of correcting the image data using data lack information obtained by reducing grid components in accordance with the model function subjected to the fitting performed in the fitting step.
A non-transitory computer-readable storage medium storing a program that causes a computer to execute:
- an obtaining step of using an obtaining device to obtain image data captured by detecting radial rays via a grid disposed in front of a radiation detector while resetting odd-numbered lines or even-numbered lines of the radiation detector;
- a calculating step of calculating data lack information of the image data including grid components caused by the grid from a start of a radial rays to detection of the radial rays by the obtaining device, by calculating ratios of pixels in which data lack occurs in odd-numbered lines or even-numbered lines to pixels in which data lack does not occur using adjacent lines that are normal, wherein the data lack occurs in odd-numbered lines or even-numbered lines by resetting the odd-numbered lines or the even-numbered lines of the radiation detector;
- a fitting step of fitting a model function representing data lack to the data lack information;
- and
- a correcting step of correcting the image data using data lack information obtained by reducing grid components in accordance with the model function subjected to the fitting performed in the fitting step.
Dependencies are inferred from the claim text.