JP2002330341A5 - Image processing method, image processing apparatus, radiation image processing apparatus, image processing system and program - Google Patents
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【０００１】
【発明の属する技術分野】
本発明は、例えば、散乱放射線を除去するためのグリッドを使用した放射線撮影により被写体の放射線画像を取得する装置或いはシステムに用いられる、画像処理方法、画像処理装置、放射線画像処理装置、画像処理システム及びプログラムに関するものである。
[0001]
[Technical field to which the invention belongs]
The present invention is, for example, an image processing method, an image processing device, a radiographic image processing device, an image processing system used in a device or system for acquiring a radiographic image of a subject by radiography using a grid for removing scattered radiation. And about the program.
そこで、本発明は、上記の欠点を除去するために成されたもので、放射線画像に対して適切な画素欠陥補正を施すことのできる画像処理方法、画像処理装置、放射線画像処理装置、画像処理システム及びプログラムを提供することを目的とする。 Therefore, the present invention has been made to eliminate the above-mentioned defects, and is an image processing method, an image processing device, a radial image processing device, and an image processing capable of appropriately performing pixel defect correction on a radial image. The purpose is to provide systems and programs.
【００１７】
【課題を解決するための手段】
本発明の画像処理方法の第１の態様は、複数の撮像素子を有する撮影装置で放射線撮影された画像データを処理する画像処理方法であって、前記撮像素子の欠陥素子の位置を基準として前記画像データ中から複数の画素を選択する選択工程と、該選択した画素に対応する画素値を用いて前記欠陥素子に対応する画素の画素値を線形予測式に基づき算出する算出工程と、前記欠陥素子に対応する画素の画素値を前記算出した画素値とする補正工程とを有することを特徴とする。
[0017]
[Means for solving problems]
The first aspect of the image processing method of the present invention is an image processing method for processing image data radiographed by an image pickup apparatus having a plurality of image pickup elements, wherein the image processing method is based on the position of a defective element of the image pickup element. A selection step of selecting a plurality of pixels from the image data, a calculation step of calculating the pixel value of the pixel corresponding to the defect element using the pixel value corresponding to the selected pixel based on a linear prediction formula, and the defect. It is characterized by having a correction step in which the pixel value of the pixel corresponding to the element is set to the calculated pixel value.
本発明の画像処理方法の第２の態様は、被写体からの散乱放射線を除去するためのグリッドを使用した放射線撮影により得られた画像データを処理する画像処理方法であって、前記画像データから前記グリッドの画像成分を除去する除去工程と、前記撮像素子の欠陥素子に対応する画素値を、前記画像成分が除去された画像データにおける、該欠陥画素に隣接する画素に対応する画素値に基づいて算出された値に置換する補正工程とを有することを特徴とする。 A second aspect of the image processing method of the present invention is an image processing method for processing image data obtained by radiography using a grid for removing scattered radiation from a subject, and the image data is described as described above. The removal step of removing the image component of the grid and the pixel value corresponding to the defective element of the image pickup element are based on the pixel value corresponding to the pixel adjacent to the defective pixel in the image data from which the image component is removed. It is characterized by having a correction step of replacing with a calculated value.
本発明の画像処理装置は、被写体から散乱放射線を除去するためのグリッドが放射線撮影装置に装着されているか否かを検知する検知手段を有し、前記グリッドが装着されている場合に、前記画像処理方法を実行することを特徴とする。 The image processing apparatus of the present invention has a detecting means for detecting whether or not a grid for removing scattered radiation from a subject is attached to the radiography apparatus, and when the grid is attached, the image is described. It is characterized by executing a processing method.
本発明のプログラムの第１の態様は、被写体からの散乱放射線を除去するためのグリッドを使用した放射線撮影により得られた画像データを処理するためにコンピュータを、前記画像データを撮像するための撮像素子の欠陥素子に対応する画素値に対して、該欠陥画素の位置を基準として複数の画素を選択する選択手段と、該選択した画素に対応する画素値を用いて前記欠陥素子に対応する画素の画素値を線形予測式に基づき算出する算出手段と、前記欠陥素子に対応する画素の画素値を前記算出した画素値とする補正手段として機能させることを特徴とする。 A first aspect of the program of the present invention is to use a computer to process image data obtained by radiography using a grid for removing scattered radiation from a subject, and to capture the image data. A selection means for selecting a plurality of pixels based on the position of the defective pixel with respect to the pixel value corresponding to the defective element of the element, and a pixel corresponding to the defective element using the pixel value corresponding to the selected pixel. It is characterized by functioning as a calculation means for calculating the pixel value of the above based on a linear prediction formula and a correction means for setting the pixel value of the pixel corresponding to the defective element to the calculated pixel value.
本発明のプログラムの第２の態様は、被写体からの散乱放射線を除去するためのグリッドを使用した放射線撮影により得られた画像データを処理するためにコンピュータを、前記画像データから前記グリッドの画像成分を除去する除去手段と、前記画像データを撮像するための撮像素子の欠陥素子に対応する画素値を、前記画像成分が除去された画像データにおける、該欠陥画素に隣接する画素に対応する画素値に基づいて算出された値に置換する補正手段として機能させることを特徴とする。 A second aspect of the program of the present invention is to use a computer to process image data obtained by radiography using a grid for removing scattered radiation from the subject, and image components of the grid from the image data. The removal means for removing the image data and the pixel value corresponding to the defective element of the image pickup element for capturing the image data are the pixel values corresponding to the pixels adjacent to the defective pixel in the image data from which the image component is removed. It is characterized in that it functions as a correction means for replacing with a value calculated based on.
本発明の放射線画像処理装置の第１の態様は、放射線を被写体に照射するＸ線発生回路と、前記被写体を透過した前記放射線から散乱放射線を除去するためのグリッドと、前記グリッドを透過した放射線を電気信号に変換する複数の撮像素子で構成されるＸ線センサと、前記電気信号を画像データに変換するＡ／Ｄ変換器と、前記撮像素子の欠陥素子に対応する画素値に対して、該欠陥画素の位置を基準として複数の画素を選択する選択手段と、該選択した画素に対応する画素値を用いて前記欠陥素子に対応する画素の画素値を線形予測式に基づき算出する算出手段と、前記欠陥素子に対応する画素の画素値を前記算出した画素値とする補正手段とを備えることを特徴とする。 A first aspect of the radiation image processing apparatus of the present invention is an X-ray generation circuit that irradiates a subject with radiation, a grid for removing scattered radiation from the radiation transmitted through the subject, and radiation transmitted through the grid. For an X-ray sensor composed of a plurality of image pickup elements that convert the electric signal into an electric signal, an A / D converter that converts the electric signal into image data, and a pixel value corresponding to a defective element of the image pickup element. A selection means for selecting a plurality of pixels based on the position of the defective pixel, and a calculation means for calculating the pixel value of the pixel corresponding to the defective element based on a linear prediction formula using the pixel value corresponding to the selected pixel. And a correction means for setting the pixel value of the pixel corresponding to the defective element to the calculated pixel value.
本発明の放射線画像処理装置の第２の態様は、放射線を被写体に照射するＸ線発生回路と、前記被写体を透過した前記放射線から散乱放射線を除去するためのグリッドと、前記グリッドを透過した放射線を電気信号に変換する複数の撮像素子で構成されるＸ線センサと、前記電気信号を画像データに変換するＡ／Ｄ変換器と、前記画像データから前記グリッドの画像成分を除去する除去手段と、前記撮像素子の欠陥素子に対応する画素値を、前記画像成分が除去された画像データにおける該欠陥素子に隣接する撮像素子に対応する画素値に基づいて算出された値に置換する補正手段とを備えることを特徴とする。 A second aspect of the radiation image processing apparatus of the present invention is an X-ray generation circuit that irradiates a subject with radiation, a grid for removing scattered radiation from the radiation transmitted through the subject, and radiation transmitted through the grid. An X-ray sensor composed of a plurality of image pickup elements for converting an electric signal into an electric signal, an A / D converter for converting the electric signal into image data, and a removing means for removing an image component of the grid from the image data. As a correction means for replacing the pixel value corresponding to the defective element of the image pickup element with a value calculated based on the pixel value corresponding to the image pickup element adjacent to the defect element in the image data from which the image component has been removed. It is characterized by having.
本発明の画像処理システムは、複数の機器が互いに通信可能に接続されている画像処理システムであって、前記複数の機器のうち少なくとも１つの機器は、前記画像処理方法の機能を備えることを特徴とする。 The image processing system of the present invention is an image processing system in which a plurality of devices are connected to each other so as to be able to communicate with each other, and at least one of the plurality of devices is characterized by having the function of the image processing method. And.
【０３１１】
【発明の効果】
本発明によれば、放射線画像に対して適切な画素欠陥補正を施すことが可能となる。
[0311]
【The invention's effect】
According to the present invention, it is possible to perform appropriate pixel defect correction on a radiation image.
Claims (13)
前記撮像素子の欠陥素子の位置を基準として前記画像データ中から複数の画素を選択する選択工程と、
該選択した画素に対応する画素値を用いて前記欠陥素子に対応する画素の画素値を線形予測式に基づき算出する算出工程と、
前記欠陥素子に対応する画素の画素値を前記算出した画素値とする補正工程とを有することを特徴とする画像処理方法。An image processing method for processing image data radiographed by an imaging device having a plurality of imaging elements, comprising:
A selection step of selecting a plurality of pixels from the image data with reference to the position of the defective element of the imaging device;
Calculating the pixel value of the pixel corresponding to the defective element based on a linear prediction equation using the pixel value corresponding to the selected pixel;
And v. Correcting the pixel value of the pixel corresponding to the defective element as the calculated pixel value.
前記選択工程は前記欠陥素子に対応する画素を基準として、前記グリッドのグリッド縞に直交する方向から前記複数の画素を選択することを特徴とする請求項１記載の画像処理方法。The image data is image data obtained using a grid for removing scattered radiation from the subject,
The image processing method according to claim 1, wherein the selecting step selects the plurality of pixels from a direction orthogonal to the grid stripes of the grid with reference to the pixels corresponding to the defective element.
前記画像データから前記グリッドの画像成分を除去する除去工程と、
前記撮像素子の欠陥素子に対応する画素値を、前記画像成分が除去された画像データにおける、該欠陥画素に隣接する画素に対応する画素値に基づいて算出された値に置換する補正工程とを有することを特徴とする画像処理方法。An image processing method for processing image data obtained by radiation imaging using a grid for removing scattered radiation from a subject, comprising:
Removing an image component of the grid from the image data;
And a correction step of replacing a pixel value corresponding to a defective element of the imaging device with a value calculated based on a pixel value corresponding to a pixel adjacent to the defective pixel in the image data from which the image component is removed. An image processing method characterized by having:
前記グリッドの空間周波数に基づいて前記画像成分を前記画像から分離する分離工程と、
前記分離した画像成分の振幅を計算する振幅算出工程と、
前記振幅の値に基づいて前記画像成分の値を変更する加工工程とを有し、
該加工工程により得た画像成分を前記画像データから除去することを特徴とする請求項３又は４に記載の画像処理方法。The removal step is
Separating the image components from the image based on the spatial frequency of the grid;
An amplitude calculating step of calculating an amplitude of the separated image component;
And modifying the value of the image component based on the value of the amplitude.
5. The image processing method according to claim 3, wherein an image component obtained by the processing step is removed from the image data.
前記分離工程は該切出工程により得た前記部分画像データの画像成分を分離することを特徴とする請求項５に記載の画像処理方法。The removing step has a cutting step of cutting out partial image data corresponding to a radiation irradiation field from the image data,
6. The image processing method according to claim 5, wherein the separation step separates image components of the partial image data obtained by the cutting step.
前記グリッドが装着されている場合に、前記画像処理方法を実行することを特徴とする請求項１乃至７のいずれか一項に記載の画像処理装置。And a detection unit that detects whether a grid for removing scattered radiation from an object is attached to the radiation imaging apparatus,
The image processing apparatus according to any one of claims 1 to 7, wherein the image processing method is executed when the grid is attached.
前記画像データを撮像するための撮像素子の欠陥素子に対応する画素値に対して、該欠陥画素の位置を基準として複数の画素を選択する選択手段と、該選択した画素に対応する画素値を用いて前記欠陥素子に対応する画素の画素値を線形予測式に基づき算出する算出手段と、
前記欠陥素子に対応する画素の画素値を前記算出した画素値とする補正手段として機能させるためのプログラム。A computer for processing image data obtained by radiography using a grid to remove scattered radiation from the subject,
And selecting means for selecting a plurality of pixels based on the position of the defective pixel with respect to the pixel value corresponding to the defective element of the image pickup device for picking up the image data, and the pixel value corresponding to the selected pixel Calculating means for calculating the pixel value of the pixel corresponding to the defective element based on a linear prediction formula,
The program for functioning as correction means which makes the pixel value of the pixel corresponding to the defective element the calculated pixel value.
前記画像データから前記グリッドの画像成分を除去する除去手段と、
前記画像データを撮像するための撮像素子の欠陥素子に対応する画素値を、前記画像成分が除去された画像データにおける、該欠陥画素に隣接する画素に対応する画素値に基づいて算出された値に置換する補正手段として機能させるためのプログラム。A computer for processing image data obtained by radiography using a grid to remove scattered radiation from the subject,
Removing means for removing the image component of the grid from the image data;
A pixel value corresponding to a defective element of an imaging element for imaging the image data, a value calculated based on a pixel value corresponding to a pixel adjacent to the defective pixel in the image data from which the image component has been removed A program for functioning as a correction means to replace with.
前記被写体を透過した前記放射線から散乱放射線を除去するためのグリッドと、
前記グリッドを透過した放射線を電気信号に変換する複数の撮像素子で構成されるＸ線センサと、
前記電気信号を画像データに変換するＡ／Ｄ変換器と、
前記撮像素子の欠陥素子に対応する画素値に対して、該欠陥画素の位置を基準として複数の画素を選択する選択手段と、該選択した画素に対応する画素値を用いて前記欠陥素子に対応する画素の画素値を線形予測式に基づき算出する算出手段と、
前記欠陥素子に対応する画素の画素値を前記算出した画素値とする補正手段とを備えることを特徴とする放射線画像処理装置。An X-ray generation circuit for irradiating the subject with radiation;
A grid for removing scattered radiation from the radiation transmitted through the subject;
An X-ray sensor composed of a plurality of imaging elements for converting radiation transmitted through the grid into an electrical signal;
An A / D converter for converting the electrical signal into image data;
Corresponding to the defective element using selection means for selecting a plurality of pixels on the basis of the position of the defective pixel with respect to the pixel value corresponding to the defective element of the imaging device, and using the pixel value corresponding to the selected pixel Calculating means for calculating the pixel value of the target pixel based on the linear prediction formula,
And a correction unit configured to set the pixel value of the pixel corresponding to the defective element as the calculated pixel value.
前記被写体を透過した前記放射線から散乱放射線を除去するためのグリッドと、
前記グリッドを透過した放射線を電気信号に変換する複数の撮像素子で構成されるＸ線センサと、
前記電気信号を画像データに変換するＡ／Ｄ変換器と、
前記画像データから前記グリッドの画像成分を除去する除去手段と、
前記撮像素子の欠陥素子に対応する画素値を、前記画像成分が除去された画像データにおける該欠陥素子に隣接する撮像素子に対応する画素値に基づいて算出された値に置換する補正手段とを備えることを特徴とする放射線画像処理装置。An X-ray generation circuit for irradiating the subject with radiation;
A grid for removing scattered radiation from the radiation transmitted through the subject;
An X-ray sensor composed of a plurality of imaging elements for converting radiation transmitted through the grid into an electrical signal;
An A / D converter for converting the electrical signal into image data;
Removing means for removing the image component of the grid from the image data;
Correction means for replacing the pixel value corresponding to the defective element of the image pickup element with the value calculated based on the pixel value corresponding to the image pickup element adjacent to the defective element in the image data from which the image component is removed; A radiation image processing apparatus comprising:
前記複数の機器のうち少なくとも１つの機器は、請求項１〜７の何れか一項に記載の画像処理方法の機能を備えることを特徴とする画像処理システム。An image processing system in which a plurality of devices are communicably connected to each other,
An image processing system, wherein at least one device among the plurality of devices comprises the function of the image processing method according to any one of claims 1 to 7.
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| WO2004061480A1 (en) | 2003-01-06 | 2004-07-22 | Koninklijke Philips Electronics N.V. | Method and apparatus to recover a dead pixel in digital imaging systems |
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| JP2010261828A (en) * | 2009-05-08 | 2010-11-18 | Shimadzu Corp | Detection method of defective pixel in two-dimensional array x-ray detector, and detection device of the defective pixel |
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