JPH01273487A - Digital x-ray device - Google Patents
Digital x-ray deviceInfo
- Publication number
- JPH01273487A JPH01273487A JP63103322A JP10332288A JPH01273487A JP H01273487 A JPH01273487 A JP H01273487A JP 63103322 A JP63103322 A JP 63103322A JP 10332288 A JP10332288 A JP 10332288A JP H01273487 A JPH01273487 A JP H01273487A
- Authority
- JP
- Japan
- Prior art keywords
- image
- picture
- frequency component
- output
- low frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000926 separation method Methods 0.000 claims description 2
- 238000009499 grossing Methods 0.000 abstract description 8
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 206010047571 Visual impairment Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 241000406668 Loxodonta cyclotis Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
- Image Processing (AREA)
- Picture Signal Circuits (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Image Analysis (AREA)
Abstract
Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は、デジタル画像処理の分野で利用される。[Detailed description of the invention] [Industrial application field] INDUSTRIAL APPLICATION This invention is utilized in the field of digital image processing.
本発明は、デジタルX線装置に関し、詳しくはイメージ
インテンシファイア及びX線テレビカメラを経て得られ
たデジタルX線透視像のノイズ低減処理が施されたデジ
タルX線装置に関する。The present invention relates to a digital X-ray apparatus, and more particularly to a digital X-ray apparatus in which noise reduction processing is performed on a digital X-ray fluoroscopic image obtained through an image intensifier and an X-ray television camera.
[従来技術]
従来より、画像をリカーシブフィルタに通して残像効果
を与えるという画像処理により画像中のノイズの低減が
行なわれている。[Prior Art] Conventionally, noise in an image has been reduced by image processing in which the image is passed through a recursive filter to give an afterimage effect.
[発明が解決しようとする課題]
イメージインテンシファイア(1,1,)及びX線テレ
ビカメラ(XTV)を経て得られるX線透視像には、量
子ノイズが多いことが知られている。[Problems to be Solved by the Invention] It is known that an X-ray fluoroscopic image obtained through an image intensifier (1,1,) and an X-ray television camera (XTV) contains a lot of quantum noise.
XTVから得られるビデオ信号をデジタル化して、リカ
ーシブフィルタの手法によりノイズリダクションが良く
行なわれているが、リカーシブフィルタは静止画に対し
ては有効であるが、動画像に対しては残像感があり、か
ならずしも有効な方法とはいえない。The video signal obtained from XTV is digitized and noise reduction is often performed using a recursive filter method, but although the recursive filter is effective for still images, it produces a feeling of afterimage for moving images. , it is not necessarily an effective method.
本発明の目的は、動画像ないし連続画像に対してリカー
シブフィルタをかけた場合でも残像感が改善され、鮮明
な画像を表示できるデジタルX線装置を提供することで
ある。An object of the present invention is to provide a digital X-ray apparatus that can display clear images with improved afterimage feeling even when a recursive filter is applied to moving images or continuous images.
[課題を解決するための手段]
前記した目的は、イメージインテンシファイア及びX線
テレビカメラを経て得られたデジタルX線連続画像に対
して各フレーム毎に低周波成分の画像と高周波成分の画
像とに分離する分離回路部と、高周波成分の画像につい
てリカーシブフィルタをかけるフィルタ回路部と、分離
された低周波成分の画像とフィルタ回路部を経た高周波
成分の画像との加算回路部とを具備することにより、達
成される。[Means for Solving the Problems] The above-mentioned purpose is to generate an image of low frequency components and an image of high frequency components for each frame of continuous digital X-ray images obtained through an image intensifier and an X-ray television camera. a separation circuit section that separates the image into two, a filter circuit section that applies a recursive filter to the high frequency component image, and an addition circuit section that adds the separated low frequency component image and the high frequency component image that has passed through the filter circuit section. This is achieved by:
1作 用]
ノイズとエツジ部分のみの画像を構成する透視画(象の
高周波成分をとくに分離して、これに対してのみリカー
シブフィルタをかけてノイズ部分が落されエツジ部分が
残された画像を、リカーシブフィルタをかけない低周波
成分の画像に加算して、表示画像を構成する。1 action] A perspective image that consists of an image containing only noise and edge parts (particularly separates the high frequency components of the elephant, applies a recursive filter only to this, and creates an image in which the noise part is removed and the edge parts are left) , is added to the low frequency component image that is not subjected to a recursive filter to form a display image.
[実 施 例] 本発明の好適な実施例は、図面に基づいて説明される。[Example] A preferred embodiment of the invention will be explained based on the drawings.
第1図はその1実施例を示したノイズ低減処理部のブロ
ック図であり、第2図はりカーシブフィルタ14の内部
回路図である。FIG. 1 is a block diagram of a noise reduction processing section showing one embodiment thereof, and FIG. 2 is an internal circuit diagram of the cursive filter 14.
図示しないイメージインテンシファイア及びX線テレビ
カメラ(XTV)を経て、図示されているビデオ信号な
いし画像は、A/D変換器11にてデジタル化された後
、平滑化回路12にて2次元の平滑化処理が行なわれる
。The illustrated video signal or image passes through an image intensifier and an X-ray television camera (XTV) (not shown), is digitized by an A/D converter 11, and then converted into a two-dimensional signal by a smoothing circuit 12. Smoothing processing is performed.
平滑化回路12の出力aは透視画像の低周波成分のみの
画像となっている。 一方、A/D変換器11の出力は
、平滑化回路12の出力とともに減算器13に入力され
、画出力間のi7!算が行なわれる。The output a of the smoothing circuit 12 is an image containing only low frequency components of the fluoroscopic image. On the other hand, the output of the A/D converter 11 is input to the subtracter 13 together with the output of the smoothing circuit 12, and the i7! The calculation is done.
減算器13の出力すは、低周波成分の画像と分離されて
おり、透視画像の高周波成分、つまりはノイズとエツジ
部分のみの画像となっている。The output of the subtractor 13 is separated from the low frequency component image, and is an image containing only the high frequency components of the perspective image, that is, noise and edge portions.
出力すはリカーシブフィルタ14に入力され、ノイズ成
分が落とされた後エッヂ部分のみの画像Cとなって、加
算器5に入力される。The output signal is input to a recursive filter 14, and after noise components are removed, it becomes an image C containing only the edge portion, and is input to an adder 5.
カロ算器15では、低周波成分のみの像aとノイズの落
とされたエツジ部分のみの像Cの加算が実行今れ、加算
結果はD/A変換器16によりアナログ化され、図示し
ないモニタに表示される。The Calo calculator 15 adds the image A containing only the low frequency component and the image C containing only the edge portion where noise has been removed.The addition result is converted into an analog by the D/A converter 16 and displayed on a monitor (not shown). Is displayed.
なお、リカーシブフィルタ14の内部は、第2図に例示
するように、係数KにがかるN/K]演算器14aと[
1−1/K]演算器14b、加算器14C及びフレーム
メモリ14dからなる。Note that, inside the recursive filter 14, as illustrated in FIG.
1-1/K] consists of an arithmetic unit 14b, an adder 14C, and a frame memory 14d.
[劾 果]
一般に、物体の運動は低周波成分の移動が大きい。 本
発明では、低周波成分にはりカーシブフィルタをかけず
に運動に追従させており、従来のように画像の全成分に
対してりカーシブフィルタをかけた場合に比較して、残
像感は改善され、鮮明な画像が表示される。[Conclusion] In general, the movement of an object has a large movement of low frequency components. In the present invention, the motion is followed without applying a cursive filter to the low frequency components, and compared to the conventional case where a cursive filter is applied to all image components, the afterimage feeling is reduced. Improved and clearer images are displayed.
第1図は本発明の1実施例を示したノイズ処理部フロッ
ク図、第2図は本発明によるリカーシブフィルタの内部
回路例示図である。
11はA/D変換器、12は平滑化回路、13は減算器
、14はリカーシブフィルタ、15は加算器、16はD
/A変換器である。
特許出願人 株式会社 島津製作所FIG. 1 is a block diagram of a noise processing section showing one embodiment of the present invention, and FIG. 2 is a diagram illustrating an internal circuit of a recursive filter according to the present invention. 11 is an A/D converter, 12 is a smoothing circuit, 13 is a subtracter, 14 is a recursive filter, 15 is an adder, 16 is a D
/A converter. Patent applicant: Shimadzu Corporation
Claims (1)
を経て得られたデジタルX線連続画像に対して各フレー
ム毎に低周波成分の画像と高周波成分の画像とに分離す
る分離回路部と、高周波成分の画像についてリカーシブ
フイルタをかけるフィルタ回路部と、分離された低周波
成分の画像とフィルタ回路部を経た高周波成分の画像と
の加算回路部とを具備していることを特徴とする、デジ
タルX線装置。1. A separation circuit unit that separates the continuous digital X-ray images obtained through the image intensifier and the X-ray television camera into low-frequency component images and high-frequency component images for each frame; A digital X-ray apparatus characterized by comprising a filter circuit section that applies a recursive filter to an image, and an addition circuit section that adds the separated low-frequency component image and the high-frequency component image that has passed through the filter circuit section. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63103322A JPH01273487A (en) | 1988-04-26 | 1988-04-26 | Digital x-ray device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63103322A JPH01273487A (en) | 1988-04-26 | 1988-04-26 | Digital x-ray device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01273487A true JPH01273487A (en) | 1989-11-01 |
Family
ID=14350957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63103322A Pending JPH01273487A (en) | 1988-04-26 | 1988-04-26 | Digital x-ray device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01273487A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5485371A (en) * | 1990-02-14 | 1996-01-16 | Fuji Photo Film Co., Ltd. | Method for forming energy subtraction radiation images, and method and apparatus for smoothing radiation images |
JP2006230512A (en) * | 2005-02-23 | 2006-09-07 | Hitachi Medical Corp | Radiographic diagnostic apparatus, image processing method and program |
JP2007505668A (en) * | 2003-09-22 | 2007-03-15 | コニンクリユケ フィリップス エレクトロニクス エヌ.ブイ. | Medical image enhancement with temporal filter |
EP2000975A1 (en) | 2007-06-05 | 2008-12-10 | Canon Kabushiki Kaisha | Image processing apparatus, image processing method, and program |
EP2000976A1 (en) | 2007-06-07 | 2008-12-10 | Canon Kabushiki Kaisha | Image processing apparatus and image processing method |
US20110158550A1 (en) * | 2009-12-24 | 2011-06-30 | Canon Kabushiki Kaisha | Information processing apparatus, processing method, and computer-readable storage medium |
US8675946B2 (en) | 2008-12-05 | 2014-03-18 | Kabushiki Kaisha Toshiba | X-ray diagnosis apparatus and image processing apparatus |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6175675A (en) * | 1984-09-21 | 1986-04-18 | Matsushita Electric Ind Co Ltd | Noise reducing device |
JPS62234495A (en) * | 1986-03-31 | 1987-10-14 | Nec Home Electronics Ltd | Magnetic recording and reproducing device |
-
1988
- 1988-04-26 JP JP63103322A patent/JPH01273487A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6175675A (en) * | 1984-09-21 | 1986-04-18 | Matsushita Electric Ind Co Ltd | Noise reducing device |
JPS62234495A (en) * | 1986-03-31 | 1987-10-14 | Nec Home Electronics Ltd | Magnetic recording and reproducing device |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5485371A (en) * | 1990-02-14 | 1996-01-16 | Fuji Photo Film Co., Ltd. | Method for forming energy subtraction radiation images, and method and apparatus for smoothing radiation images |
JP2007505668A (en) * | 2003-09-22 | 2007-03-15 | コニンクリユケ フィリップス エレクトロニクス エヌ.ブイ. | Medical image enhancement with temporal filter |
JP2006230512A (en) * | 2005-02-23 | 2006-09-07 | Hitachi Medical Corp | Radiographic diagnostic apparatus, image processing method and program |
EP2000975A1 (en) | 2007-06-05 | 2008-12-10 | Canon Kabushiki Kaisha | Image processing apparatus, image processing method, and program |
US8155476B2 (en) | 2007-06-05 | 2012-04-10 | Canon Kabushiki Kaisha | Image processing apparatus, image processing method, and program |
EP2000976A1 (en) | 2007-06-07 | 2008-12-10 | Canon Kabushiki Kaisha | Image processing apparatus and image processing method |
US7929031B2 (en) | 2007-06-07 | 2011-04-19 | Canon Kabushiki Kaisha | Image processing apparatus and image processing method |
US8675946B2 (en) | 2008-12-05 | 2014-03-18 | Kabushiki Kaisha Toshiba | X-ray diagnosis apparatus and image processing apparatus |
USRE48583E1 (en) | 2008-12-05 | 2021-06-08 | Canon Medical Systems Corporation | X-ray diagnosis apparatus and image processing apparatus |
US20110158550A1 (en) * | 2009-12-24 | 2011-06-30 | Canon Kabushiki Kaisha | Information processing apparatus, processing method, and computer-readable storage medium |
US8655034B2 (en) * | 2009-12-24 | 2014-02-18 | Canon Kabushiki Kaisha | Information processing apparatus, processing method, and computer-readable storage medium |
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