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- Gabor T. Herman, Edgar Garduño, Ran Davidi, Yair Censor
- Medical physics
- 2012

PURPOSE
To describe and mathematically validate the superiorization methodology, which is a recently developed heuristic approach to optimization, and to discuss its applicability to medical physics problem formulations that specify the desired solution (of physically given or otherwise obtained constraints) by an optimization criterion.
METHODS
The… (More)

- Edgar Garduño, Mona Wong-Barnum, Niels Volkmann, Mark H Ellisman
- Journal of structural biology
- 2008

In electron tomography the reconstructed density function is typically corrupted by noise and artifacts. Under those conditions, separating the meaningful regions of the reconstructed density function is not trivial. Despite development efforts that specifically target electron tomography manual segmentation continues to be the preferred method. Based on… (More)

- Gabor T. Herman, Roberto Marabini, José María Carazo, Edgar Garduño, Robert M. Lewitt, Samuel Matej
- Int. J. Imaging Systems and Technology
- 2000

Electron microscopy is a powerful technique for imaging complex biological macromolecules in order to further the understanding of their functions. When combined with sufficiently careful sample preparation procedures that preserve the native structure of the macromolecules and with sophisticated image processing procedures, electron microscopy can lead to… (More)

Digital image segmentation is a process in which one assigns distinct labels to different objects in a digital image. The MOFS (Multi Object Fuzzy Segmentation) algorithm has been successfully applied to the segmentation of images from several modalities. However, the traditional MOFS algorithm fails when applied to images whose composing objects are… (More)

- Edgar Garduño, Gabor T. Herman
- Electr. Notes Theor. Comput. Sci.
- 2001

Algebraic Reconstruction Techniques (ART) for the reconstruction of distributions from projections have yielded improvements in diverse fields such as medical imaging and electron microscopy. An important property of these methods is that they allow the use of various basis functions. Recently spherically symmetric functions (blobs) have been introduced as… (More)

- Edgar Garduño, Gabor T. Herman
- Int. J. Imaging Systems and Technology
- 2008

The usefulness of fuzzy segmentation algorithms based on fuzzy connectedness principles has been established in numerous publications. New technologies are capable of producing larger-and-larger datasets and this causes the sequential implementations of fuzzy segmentation algorithms to be time-consuming. We have adapted a sequential fuzzy segmentation… (More)

- Bruno M. Carvalho, Edgar Garduño, Gabor T. Herman
- ICAPR
- 2001

- Bruno M. Carvalho, Tiago S. Souza, Edgar Garduño
- SAC
- 2012

Digital image segmentation is the process of assigning distinct labels to different objects in a digital image, and the fuzzy segmentation algorithm has been used successfully in the segmentation of images from several modalities. However, the traditional fuzzy segmentation algorithm fails to segment objects that are characterized by textures whose patterns… (More)

- Edgar Garduño, Gabor T. Herman
- Theor. Comput. Sci.
- 2005

An implicit surface of a density function is the set of points at which the value of the function is equal to a fixed threshold. An object that is defined as the collection of points at which the density function value is above the threshold can be visualized by displaying the implicit surface. Some methods for the reconstruction of biological… (More)

- Bruno M. Carvalho, Lucas M. Oliveira, Edgar Garduño
- ISBI
- 2006