Examinando por Autor "Pantrigo, Juan J."

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SCASA: From Synthetic to Real Computer-Aided Sperm Analysis
(Springer, Cham, 2022-05-31) Hernández-Ferrándiz, Daniel; Pantrigo, Juan J.; Cabido, Raul
Sperm analysis has a central role in diagnosing and treating infertility. Traditionally, assessment of sperm health was performed by an expert by viewing the sample through a microscope. In order to simplify this task and assist the expert, CASA (Computer-Assisted Sperm Analysis) systems were developed. These systems rely on low-level computer vision tasks such as classification, detection and tracking to analyze sperm health and motility. These tasks have been widely addressed in the literature, with some supervised approaches surpassing the human capacity to solve them. However, the accuracy of these models have not been directly translated into CASA systems. This is mainly due to the absence of labelled data, as well as the difficulty in obtaining it. In this work we propose the generation of synthetic semen samples to tackle the absence of labelled data. We propose a parametric modelling of spermatozoa, and show how models trained on synthetic data can be used on real images with no need of further fine-tuning stage.
Visual classification of dumpsters with capsule networks
(ACS, 2022) Garcia-Espinosa, Francisco J.; Concha, David; Pantrigo, Juan J.; Cuesta-Infante, Alfredo
Garbage management is an essential task in the everyday life of a city. In many countries, dumpsters are owned and deployed by the public administration. An updated what-and-where list is in the core of the decision making process when it comes to remove or renew them. Moreover, it may give extra information to other analytics in a smart city context. In this paper, we present a capsule network-based architecture to automate the visual classification of dumpsters. We propose different network hyperparameter settings, such as reducing convolutional kernel size and increasing convolution layers. We also try several data augmentation strategies, as crop and flip image transformations. We succeed in reducing the number of network parameters by 85% with respect to the best previous method, thus decreasing the required training time and making the whole process suitable for low cost and embedded software architectures. In addition, the paper provides an extensive experimental analysis including an ablation study that illustrates the contribution of each component in the proposed method. Our proposal is compared with the state-of-the-art method, which is based on a Google Inception V3 architecture pretrained with Imagenet. Experimental results show that our proposal achieves a 95.35% accuracy, 2.35% over the previous best method.