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公开(公告)号：JP2000132674A
公开(公告)日：2000-05-12
申请号：JP29979799
申请日：1999-10-21
Applicant: KONINKL PHILIPS ELECTRONICS NV
Inventor： AACH TIL , BUZUG THORSTEN DR , STAHL MARTIN , PRALOW THOMAS , MAACK INGO , SPRINGUB ANSGAR
Abstract: PROBLEM TO BE SOLVED: To obtain optimum picture quality by multiplying the change of a picture value by a coefficient based on an average picture value in a window in the periphery of an objective picture element in an original picture and/or the dispersion of the picture value and the picture value itself. SOLUTION: The picture values of respective picture elements in a detailed picture Si are converted in a block 21 having a non-linear conversion characteristic. A conversion processing is executed by using a look-up table where the respective picture values of the detailed picture Si as input are related to the picture value of a conversion picture Sei which is possible as output. In a block 22, a difference is detected between the picture value as the output of the block 21 and the picture value of the objective picture element in the detailed picture Si. In a multiplication block 23, the difference is multiplied by the coefficient (b) of 0-1. The coefficient (b) is decided from the picture having a value matched with average lightness in an objective position on the respective picture elements of the detailed picture Si. At that time, the original picture Ii-1 of the detailed picture Si can be used since it has the totally similar number of picture elements as that of the detailed picture Si.
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公开(公告)号：JP2003158677A
公开(公告)日：2003-05-30
申请号：JP2002235087
申请日：2002-08-12
Applicant: KONINKL PHILIPS ELECTRONICS NV
Inventor： SCHMITZ GEORG DR , AACH TIL , RONGEN PETER MARIA JOHANNES , STEGEHUIS HERMAN
IPC: A61B6/00 , G01N23/083 , G06T5/00 , G06T5/20 , G06T5/50 , G06T7/00 , G06T13/00 , H04N1/409 , H04N5/325 , H05G1/00
Abstract: PROBLEM TO BE SOLVED: To provide an apparatus and method for warranting improved display of a detailed image, in particular, recovery blood vessels. SOLUTION: This invention relates to the apparatus and method for the improved display of small dark structures such as in particular coronary blood vessels in digital X-ray images. A live image S is initially subjected to multiscale decomposition in which firstly multiple uses of low-pass filtering with subsequent resolution reduction RED, and secondly resolution increases using subsequent low-pass filtration, give detailed images D1, D2, D3, D4 of different resolution. In accordance with the first variant of the method, a mask M representative of the uninteresting image background is subtracted from the detailed image D4 having the lowest degree of resolution. This ensures that the subtraction only comprises correspondingly coarse structures with dimensions greater than the expected image motion.
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公开(公告)号：WO03083777A2
公开(公告)日：2003-10-09
申请号：PCT/IB0301183
申请日：2003-04-01
Applicant: PHILIPS INTELLECTUAL PROPERTY , KONINKL PHILIPS ELECTRONICS NV , MOLLUS SABINE , STUKE INGO , ECK KAI , AACH TIL
Inventor： MOLLUS SABINE , STUKE INGO , ECK KAI , AACH TIL
CPC classification number: A61B6/541 , G06T7/38 , G06T2207/30048
Abstract: The invention relates to a method of determining a corresponding image of a moving object for a reference image from an image sequence which represents the motion as a sequence of states of motion. To this end, two motion signals, representing the development of the relevant motions, are examined for similarities. Using the similarity function thus obtained, that image in the image sequence can be determined which represents at least approximately the state of motion of the object which is represented in the reference image. Furthermore, the invention relates to a system which is suitable for carrying out the method as well as to a computer program and a computer program product enabling a data processing unit to carry out the method.
Abstract translation: 本发明涉及一种从表示运动的图像序列确定参考图像的移动物体的相应图像的方法，该图像序列是运动状态序列。 为此，审查了相关动议的两个运动信号，以表达相似的动议。 使用如此获得的相似度函数，可以确定图像序列中的至少近似表示在参考图像中的对象的运动状态的图像。 此外，本发明涉及一种适合于执行该方法的系统，以及一种能使数据处理单元执行该方法的计算机程序和计算机程序产品。
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公开(公告)号：DE69913311T2
公开(公告)日：2004-10-14
申请号：DE69913311
申请日：1999-09-22
Abstract: An x-ray examination apparatus comprises an x-ray source for generating an x-ray image and an image analysis system derives brightness variations from the x-ray image and derives a dose control signal dependent on said brightness variations in order to control the x-ray source. The image analysis system derives a distribution of said brightness variations and derives the dose control signal from the distribution of brightness variations. Preferably, the image analysis system is arranged to derive the brightness variations from the processed image and a histogram analysis is employed to derive the dose control signal.
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公开(公告)号：DE69913311D1
公开(公告)日：2004-01-15
申请号：DE69913311
申请日：1999-09-22
Abstract: An x-ray examination apparatus comprises an x-ray source for generating an x-ray image and an image analysis system derives brightness variations from the x-ray image and derives a dose control signal dependent on said brightness variations in order to control the x-ray source. The image analysis system derives a distribution of said brightness variations and derives the dose control signal from the distribution of brightness variations. Preferably, the image analysis system is arranged to derive the brightness variations from the processed image and a histogram analysis is employed to derive the dose control signal.
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Patent Agency Ranking
公开(公告)号：DE69624225T2
公开(公告)日：2003-07-10
申请号：DE69624225
申请日：1996-12-13
Inventor： FUDERER MIHA , AACH TIL , KUNZ WILHELM
Abstract: An image is processed taking into account the direction of a predominant structure of the image. Said predominant direction is derived from image information in the image. In particular, the covariance matrix having matrix elements depending on products of differences between pixel-values in separate directions is calculated. The eigenvectors of the covariance matrix correspond with the predominant direction of the image structure and the eigenvalues of the covariance matrix represent the strength of the structure in the image. The covariance matrix is computed locally, i.e. for separate regions in the images so as to take variations of the direction of predominant structures into account.
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公开(公告)号：DE69832357T2
公开(公告)日：2006-08-03
申请号：DE69832357
申请日：1998-06-02
Inventor： AACH TIL , KUNZ WILHELM , KOCH UWE
Abstract: The invention discloses a method of processing an image including the steps of decomposing the image into detail images at successive resolution levels. The detail images at successive resolution levels contain image information at respective spatial scales. Filtering of detail images is carried-out in dependence on at least one subsequent detail image having a lower resolution level than the current detail image. A processed image is reconstructed from the filtered detail images.
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公开(公告)号：DE69615994D1
公开(公告)日：2001-11-22
申请号：DE69615994
申请日：1996-05-31
Applicant: KONINKL PHILIPS ELECTRONICS NV
Inventor： AACH TIL , KUNZ WILHELM , LUDEKE HERMANN
Abstract: An image processing method includes multi-resolution decomposition to decompose an input image into frequency-band images, which are subsequently filtered according to an order statistics filtering. Preferably, a finite impulse response median hybrid is employed. The filtered frequency-band images are synthesized to form the filtered output image.
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公开(公告)号：DE69832357D1
公开(公告)日：2005-12-22
申请号：DE69832357
申请日：1998-06-02
Inventor： AACH TIL , KUNZ WILHELM , KOCH UWE
Abstract: The invention discloses a method of processing an image including the steps of decomposing the image into detail images at successive resolution levels. The detail images at successive resolution levels contain image information at respective spatial scales. Filtering of detail images is carried-out in dependence on at least one subsequent detail image having a lower resolution level than the current detail image. A processed image is reconstructed from the filtered detail images.
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公开(公告)号：DE69624225D1
公开(公告)日：2002-11-14
申请号：DE69624225
申请日：1996-12-13
Inventor： FUDERER MIHA , AACH TIL , KUNZ WILHELM
Abstract: An image is processed taking into account the direction of a predominant structure of the image. Said predominant direction is derived from image information in the image. In particular, the covariance matrix having matrix elements depending on products of differences between pixel-values in separate directions is calculated. The eigenvectors of the covariance matrix correspond with the predominant direction of the image structure and the eigenvalues of the covariance matrix represent the strength of the structure in the image. The covariance matrix is computed locally, i.e. for separate regions in the images so as to take variations of the direction of predominant structures into account.
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