Browsing by Author "Bautista Llivisaca, Mateo Sebastian"

Now showing 1 - 5 of 5

Accuracy of connected confidence left ventricle segmentation in 3-D multi-slice computerized tomography images
(Institute of Electrical and Electronics Engineers Inc., 2018) Medina, Rubén; Bautista Llivisaca, Mateo Sebastian; Morocho Zurita, Carlos Villie; Bautista Llivisaca, Mateo Sebastian
Cardiovascular diseases are the main cause of death in the World. This fact has motivated different actions for prevention, diagnosis and monitoring of cardiovascular diseases. In this work, the accuracy of a connected confidence left ventricle segmentation method is performed. This task is accomplished using a software platform for left ventricle segmentation of 3-D cardiac Multi-Slice Computerized Tomography (MSCT) images that is also described. The software platform has as a goal performing research about efficient methods for cardiac image segmentation and quantification. The accuracy assessment of the segmentation method is performed by comparing the estimated segmentation with respect to segmentations manually traced by cardiologists. Results show that the segmentation method provides Dice Similarity coefficients higher than 0.90 with low computational cost. The obtained segmentation is able to include within the left ventricular lumen the papillary trabeculae muscles, enabling further accurate estimation of the left ventricular mass.
Left ventricle myocardium segmentation in multi-slice computerized tomography
(INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS INC., 2016-10-19) Bautista Llivisaca, Mateo Sebastian; Morocho Zurita, Carlos Villie; Vanegas Peralta, Pablo Fernando
This paper briefly describes a left ventricle myocardium segmentation method in multi-slice computerized tomography images. The segmentation technique is based on level-sets deformable contours. The proposed method has two stages: in the first stage the left ventricle internal wall or endocardium is segmented. In the second stage the external wall is segmented starting with an initialization based on the endocardial segmented shape. This algorithm is intended for incorporation within a software platform for visualization and processing of cardiac images. This platform would help the diagnosis of the left ventricle hypertrophy (LVH).
Level-set segmentation of footprint images aimed at insole design
(Institute of Electrical and Electronics Engineers Inc., 2018) Medina, Rubén; Zeas Puga, Ana Lucía; Morocho, Villie; Bautista Llivisaca, Mateo Sebastian; Medina, Rubén
Chronic foot pain is a disease that progresses with age and has a high prevalence. Therapeutic procedures include the utilization of orthoses or insoles that are placed inside the footwear. Design of personalized insoles is a process that includes several stages. An important stage is the acquisition and analysis of footprint images. Their segmentation enables quantification of the footprint shape by estimating several indices that allow classification and diagnosis of foot morphology abnormalities. A segmentation method for footprint images using Level-Set algorithms is reported. Two area based Level-Set segmentation algorithms were applied. The first is the Chan-Vese algorithm using a global minimizer. The second is the Lankton algorithm that implements the Chan-Vese energy function using a localized minimizer and the Sparse Field Method for reducing the computational cost. Algorithms tested are accurate for segmenting the footprint images, providing an average Dice coefficient higher than 0.93. The Lankton algorithm is robust with respect to spatial variation in intensities within the footprint shape. It is also fast as the average time for segmenting one image is only 6.4 seconds
Sistema de apoyo a las decisiones en el ámbito de la evaluación de tierras“ForAndesT v2.0”
(2014) Bautista Llivisaca, Mateo Sebastian; Lupercio Tuquiñahui, Miriam Isabel; Vanegas Peralta, Pablo Fernando
Software tools fulfilling specific user requirementsare a very good alternative to commercials or free applications, usually the later include functions that perhaps will never be used although those can require a high amount of computational resources. Free and open tools to build software use standards that make easy to develop applications required by users. All this can be made thanks to the available literature. Currently, both the GeographicalInformation Systems and theDecisions Support Systems models, are important tools for land evaluation. With these systems it is feasible to store, modify, analyze and deploy geographic information in the field of natural resources management. This project is intended to analyze, design and implementa web version of the ForAndesT system, taking the desktop versionas the starting point. The proposed work will contribute to the development of the first decision support systemavailable in the web to support the solution of land evaluation problems. In this sense the system will be the pioneer in this area. The objective is to obtaina 100% free software tool of similar features to the desktop version.In addition, it was needed to include some processes to improve the performance of the web version.
Spatial data infrastructure as the core for activating early alerts using EWBS and interactive applications in digital terrestrial television
(Springer Verlag, 2019) Morocho Zurita, Carlos Villie; Achig Balarezo, Rosario; Santander Jaramillo, Darwin Fabian; Bautista Llivisaca, Mateo Sebastian; Achig Balarezo, Rosario
Integrated Services Digital Broadcasting Terrestrial (ISDB-T) is the standard adopted in Ecuador since 2010. There is a lack of proposals for taking advantage of communication alternatives with citizens, which the new digital technology will bring. The speed for alerting the community about dangers associated with natural hazards is an essential issue. There are many devices to alert population but none of them has the level of dissemination within households as the television does. This paper presents a software solution for early alert using the UCuenca-SDI (Spatial Data Infrastructure) core to activate an Emergency Warning Broadcasting System (EWBS) protocol in a Digital TV. The solution has two components (a) A schema to integrate the trigger module into the SDI, where the activation code is generated for EWBS. (b) An interactive app software developed over GINGA, where citizens can access …