Patents by Inventor Piet Dewaele

Piet Dewaele has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20100119134
    Abstract: For each of a number of landmarks in an image an initial position of the landmark is defined. Next a neighborhood around the initial position, comprising a number of candidate locations of the landmark is sampled and a cost is associated with each of the candidate locations. A cost function expressing a weighted sum of overall gray level cost and overall shape cost for all candidate locations is optimized. A segmented anatomic entity is defined as a path through a selected combination of candidate locations for which combination the cost function is optimized.
    Type: Application
    Filed: January 19, 2010
    Publication date: May 13, 2010
    Applicant: AGFA-GEVAERT N.V.
    Inventor: Piet Dewaele
  • Patent number: 7676095
    Abstract: For each of a number of landmarks in an image an initial position of the landmark is defined. Next a neighborhood around the initial position, comprising a number of candidate locations of the landmark is sampled and a cost is associated with each of the candidate locations. A cost function expressing a weighted sum of overall gray level cost and overall shape cost for all candidate locations is optimized. A segmented anatomic entity is defined as a path through a selected combination of candidate locations for which combination the cost function is optimized.
    Type: Grant
    Filed: August 18, 2006
    Date of Patent: March 9, 2010
    Assignee: Agfa-Gevaert NV
    Inventor: Piet Dewaele
  • Publication number: 20100046814
    Abstract: A basic component of Computer-Aided Detection systems for digital mammography comprises generating candidate mass locations suitable for further analysis. A component is described that relies on filtering either the background image or the complementary foreground mammographic detail by a purely signal processing method on the one hand or a processing method based on a physical model on the other hand. The different steps of the signal processing approach consist of band-pass filtering the image by one or more band pass filters, multidimensional clustering, iso-contouring of the distance to centroid of the one or more filtered values, and finally candidate generation and segmentation by contour processing. The physics-based approach also filters the image to retrieve a fat-corrected image to model the background of the breast, and the resulting image is subjected to a blob detection filter to model the intensity bumps on the foreground component of the breast that are associated with mass candidates.
    Type: Application
    Filed: May 6, 2009
    Publication date: February 25, 2010
    Applicant: AGFA HEALTHCARE NV
    Inventors: Piet Dewaele, Samar Mohamed, Gert Behiels
  • Patent number: 7616818
    Abstract: The orientation of an image such as a radiographic image is deduced from the digital representation of the image. In one embodiment the curvature is calculated and a decision on the orientation of the image is obtained on the basis of the value of the calculated curvature.
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: November 10, 2009
    Assignee: Agfa Healthcare
    Inventor: Piet Dewaele
  • Publication number: 20090257657
    Abstract: The present invention relates to a method for processing and presenting at least a first image (102) and a second image (103), these images being digital medical images. A first step in the method is performing image registration between the first image (102) and the second image (103) to generate a pixel-level mapping between both images. The registration takes into account a region-level correspondence between the first image (102) and the second image (103) A second step is presenting the first image (102) and the second image (103) simultaneously on a display (103). A third step is presenting a first magnification (104) of a region of interest (106) in the first image (102) and a second magnification (105) of a corresponding region (108) in the second image (103). The corresponding region (108) in the second image (103) being determined based on the pixel-level mapping.
    Type: Application
    Filed: April 8, 2009
    Publication date: October 15, 2009
    Inventors: Frederik TEMMERMANS, Rudi DEKLERCK, Marek SULIGA, Gert BEHIELS, Piet DEWAELE, Catherine BREUCQ, Johan DE MEY
  • Publication number: 20080193005
    Abstract: A workflow method for temporal nodule review by registering a reference image R with a floating image F, convolving the reference image R and the floating image with the same window function Hw to generate Rw and Fw, generating a subtraction image by performing subtraction Rw?Fw (g(r)) wherein r represents a voxel (x, y, z) in reference image R, applying a pattern detector to said subtraction image to detect corresponding nodules in reference image R and floating image F and displaying corresponding nodules.
    Type: Application
    Filed: February 8, 2008
    Publication date: August 14, 2008
    Applicant: AGFA HEALTHCARE NV
    Inventors: Dieter Seghers, Piet Dewaele, Paul Suetens
  • Publication number: 20080193001
    Abstract: Method to bring out a temporal difference between corresponding structures in a reference image R and a floating image F by convolving the reference image R and the floating image F with a window function Hw to generate Rw and Fw, applying a non-rigid transformation resulting in a transformation field g(rR) mapping every location rR to a corresponding location rF in the floating image F and generating a subtraction image by performing subtraction Rw(r)?Fw(g(r)) wherein r represents a voxel (x, y, z) in reference image R.
    Type: Application
    Filed: February 8, 2008
    Publication date: August 14, 2008
    Applicant: AGFA HEALTHCARE NV
    Inventors: Dieter Seghers, Piet Dewaele, Paul Suetens
  • Publication number: 20080193000
    Abstract: An image point in a displayed reference image R is selected and a non-rigid transformation resulting in a transformation field g(rR) mapping every location rR to a corresponding location rF in a floating image F is applied, next a rigid body transformation is applied to floating image F such that rF coincides with the selected image point and the transformed floating image is displayed.
    Type: Application
    Filed: February 8, 2008
    Publication date: August 14, 2008
    Applicant: AGFA HEALTHCARE NV
    Inventors: Dieter Seghers, Piet Dewaele, Paul Suetens
  • Patent number: 7394946
    Abstract: A method of mapping geometrical objects to a digital image. At least one anchor point in a model is selected and mapped to the digital image. A geometric transformation is computed on the basis of at least one correspondence between an anchor object and a corresponding mapped object, and the calculated geometric transformation is applied to at least one geometric object thereby mapping it from the model image to a corresponding mapped position in the digital image.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: July 1, 2008
    Assignee: Agfa Healthcare
    Inventor: Piet Dewaele
  • Patent number: 7382908
    Abstract: Several methods for retrospective correction of intensity inhomogeneities in digital diagnostic radiation images are presented. The methods are based on the correction of a digital image representation by means of a bias field. The bias field is deduced from the digital image representation of the diagnostic radiation image.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: June 3, 2008
    Assignee: Agfa-Gevaert
    Inventors: Piet Dewaele, Gert Behiels
  • Publication number: 20080101678
    Abstract: A Markov Random Field (MRF)-based technique is described for performing clustering of images characterized by poor or limited data. The proposed method is a statistical classification model that labels the image pixels based on the description of their statistical and contextual information. Apart from evaluating the pixel statistics that originate from the definition of the K-means clustering scheme, the model expands the analysis by the description of the spatial dependence between pixels and their labels (context), hence leading to the reduction of the inhomogeneity of the segmentation output with respect to the result of pure K-means clustering.
    Type: Application
    Filed: October 24, 2007
    Publication date: May 1, 2008
    Applicant: AGFA HEALTHCARE NV
    Inventors: Marek Suliga, Piet Dewaele, Rudi Deklerck, Edgard Nyssen, Gert Behiels
  • Publication number: 20070116357
    Abstract: A method for point-of-interest attraction towards an object pixel in a digital image by first performing object segmentation resulting in a contour-based or a region-based representation of object pixels and background pixels of the image. Secondly a vector distance transform image is computed comprising a vector displacement of each background pixel towards the nearest of said object pixels and the nearest object pixel for a given background pixel is determined by adding the vector displacement to said background pixel. Finally the point-of-interest is attracted towards the determined nearest object pixel.
    Type: Application
    Filed: November 21, 2006
    Publication date: May 24, 2007
    Applicant: AGFA-GEVAERT
    Inventor: Piet DEWAELE
  • Publication number: 20070047789
    Abstract: A gray value model is generated encoding photometric knowledge at landmark positions. This step exploits intensity correlation in neighborhoods sampled around landmark positions. A geometric model is generated encoding geometric knowledge between landmarks. This step exploits spatial correlation between landmarks of segmented anatomic entities.
    Type: Application
    Filed: August 18, 2006
    Publication date: March 1, 2007
    Applicant: AGFA-GEVAERT N.V.
    Inventor: Piet Dewaele
  • Publication number: 20070047790
    Abstract: For each of a number of landmarks in an image an initial position of the landmark is defined. Next a neighborhood around the initial position, comprising a number of candidate locations of the landmark is sampled and a cost is associated with each of the candidate locations. A cost function expressing a weighted sum of overall gray level cost and overall shape cost for all candidate locations is optimized. A segmented anatomic entity is defined as a path through a selected combination of candidate locations for which combination the cost function is optimized.
    Type: Application
    Filed: August 18, 2006
    Publication date: March 1, 2007
    Applicant: AGFA-GEVAERT N.V.
    Inventor: Piet Dewaele
  • Publication number: 20070025603
    Abstract: Several methods for retrospective correction of intensity inhomogeneities in digital diagnostic radiation images are presented. The methods are based on the correction of a digital image representation by means of a bias field. The bias field is deduced from the digital image representation of the diagnostic radiation image.
    Type: Application
    Filed: September 5, 2006
    Publication date: February 1, 2007
    Applicant: AGFA-GEVAERT N.V.
    Inventors: Piet Dewaele, Gert Behiels
  • Patent number: 7110588
    Abstract: Several methods for retrospective correction of intensity inhomogeneites in digital diagnostic radiation images are presented. The methods are based on the correction of a digital image representation by means of a bias field. The bias field is deduced from the digital image representation of the diagnostic radiation image.
    Type: Grant
    Filed: April 24, 2002
    Date of Patent: September 19, 2006
    Assignee: Agfa-Gevaert N.V.
    Inventors: Piet Dewaele, Gert Behiels
  • Publication number: 20060133694
    Abstract: A display device has means for controlling display of a blended image obtained by mapping a structure in a first image onto its corresponding structure in a second image by applying a geometric transformation to the first image so that the transformed first image and the second image are expressed in a common coordinate system. Starting from initial values the parameters of the geometric transformation are updated taking into account the result of an evaluation of a cost function. The superimposed images are blended.
    Type: Application
    Filed: November 2, 2005
    Publication date: June 22, 2006
    Applicant: AGFA-GEVAERT
    Inventor: Piet Dewaele
  • Patent number: 7065235
    Abstract: In a method for radiographic scoring of a radiographic image at least one region of interest is determined. Each of the determined regions of interest is displayed in close proximity to a number of reference stages each having an associated score. For each region of interest a reference stage image best matching the displayed region of interest is selected and the score number associated with the selected reference stage image is associated with the region of interest. Score numbers retained for each of the regions of interest are combined to form the score number of the radiographic image.
    Type: Grant
    Filed: September 9, 2002
    Date of Patent: June 20, 2006
    Assignee: AGFA-GEVAERT
    Inventor: Piet Dewaele
  • Publication number: 20060120583
    Abstract: A first and a second image are expressed in a common coordinate system by applying a geometric transformation to the second image so as to map a structure in the second image onto a corresponding structure in the first image in a common coordinate system. Starting from initial values, the parameters of the geometric transformation are updated taking into account the result of an evaluation of a cost function. Measurements are performed in the common coordinate system.
    Type: Application
    Filed: November 2, 2005
    Publication date: June 8, 2006
    Applicant: AGFA-GEVAERT
    Inventor: Piet Dewaele
  • Publication number: 20060098897
    Abstract: A structure in a first image is mapped onto its corresponding structure in a second image by applying a geometric transformation to the first image so that both images are expressed in a common coordinate system. Starting from initial values the parameters of the geometric transformation are updated taking into account the result of an evaluation of a cost function. Finally the superimposed images may be blended.
    Type: Application
    Filed: November 2, 2005
    Publication date: May 11, 2006
    Applicant: AGFA-GEVAERT
    Inventor: Piet Dewaele