Lab

Manuel G Forero's Lab-Semillero Lún

About the lab

Semillero Lún. Research group in image processing, computer vision, computer graphics and machine learning of the Universidad de Ibagué, Ibagué, Colombia with a branch at the Universidad Señor de Sipán, Chiclayo, Peru.

Featured projects (1)

Project
In this project, different theoretical-practical problems of digital image processing are studied, seeking to improve already published techniques or create new ones that allow to solve the problems posed.

Featured research (10)

Phase congruency is a technique that has been used for edge, corner and symmetry detection. Its implementation through the use of monogenic filters has improved its computational cost. For this purpose, different methods of implementation have been published, but they do not use a common notation, which makes it difficult to understand. Therefore, this paper presents a unified mathematical formulation that allows a general understanding of the Monogenic phase congruency concepts and establishes criteria for its use. A new protocol for parameter tuning is also described, allowing better practical results to be obtained with this technique. Some examples are presented allowing one to observe the changes produced in the parameter tuning, evidencing the validity of the proposed criteria.
Precision agriculture has greatly benefited from advances in machine vision and image processing techniques. The use of feature descriptors and detectors allows to find distinctive keypoints in an image and the use of this approach for agronomical applications has become a widespread field of study. By combining near infrared (NIR) images, acquired with a modified Nikon D80 camera, and visible spectrum (VIS) images, acquired with a Nikon D300s, a proper crop identification could be obtained. Still, the use of different sensors brings an image matching challenge due to the difference between cameras and the possible distortions from each imaging technique. The aim of this paper is to compare the performance of several feature descriptors and detectors by comparing near infrared and visual spectral bands in rice crop images. Therefore, a group of 20 different scenes with different cameras and growth stages in a rice crop were evaluated. Thus, red, green, blue (RGB) and L, a, b (CIE L*a*b*) channels were extracted from VIS images in order to compare the matches obtained between each of them and the corresponding NIR image. The BRISK, SURF, SIFT, ORB, KAZE, and AKAZE methods were implemented, which act as descriptors and detectors. Additionally, a combination was made between the FAST algorithm for the detection of keypoints with the BRIEF, BRISK, and FREAK methods for features description. BF and FLANN matching methods were used. The algorithms were implemented in Python using OpenCV library. The green channel presented the highest number of correct matches in all methods. In turn, the method that presented the highest performance both in time and in the number of correct matches was the combination of the FAST feature detector and the BRISK descriptor.

Lab head

Manuel G Forero
Department
  • Engineering
About Manuel G Forero
  • Manuel G Forero currently works at the Faculty of Engineering, Universidad de Ibagué. Manuel does research in Image Processing, Computer Vision and Pattern Recognition, Medical and microscopy imaging, Computer Graphics. His current projects are 'Cell detection and tracking in microscopy.','Noise reduction'.

Members (30)

Carlos Antonio Jacanamejoy
  • Universidad de Ibagué
Sammy A. Perdomo
  • Servicio Nacional de Aprendizaje SENA
Sergio Miranda
  • Universidad de Ibagué
Cristian Morera
  • Universidad de Ibagué
Natalia Carolina Hernandez Riaño
  • Universidad de Ibagué
Dehyro Méndez
  • Universidad de Ibagué
Sergio Alejandro Herrera Rivera
  • Universidad de Ibagué
Carlos Andrés Arias Rubio
  • Universidad de Ibagué
Andrea Acosta
Andrea Acosta
  • Not confirmed yet
Jaime Sánchez
Jaime Sánchez
  • Not confirmed yet
Juan Guillermo Moreno
Juan Guillermo Moreno
  • Not confirmed yet
Daniel A. Florez
Daniel A. Florez
  • Not confirmed yet
Luis H. Rodriguez
Luis H. Rodriguez
  • Not confirmed yet
Camilo Restrepo
Camilo Restrepo
  • Not confirmed yet
Brhayan Liberato-Tafur
Brhayan Liberato-Tafur
  • Not confirmed yet
Armando Troncoso
Armando Troncoso
  • Not confirmed yet

Alumni (3)

Julián Ávila-Navarro
  • Universidad de Ibagué
D. Rojas-Rodríguez
  • Universidad de Ibagué
Jorge Español
  • Universidad de Ibagué