Search Results for author: Riccardo La Grassa

Found 20 papers, 18 papers with code

In-season and dynamic crop mapping using 3D convolution neural networks and sentinel-2 time series

1 code implementation ISPRS Journal of Photogrammetry and Remote Sensing 2022 Ignazio Gallo, Luigi Ranghetti, Nicola Landro, Riccardo La Grassa, Mirco Boschetti

In this paper we present a Deep Neural Network-based approach capable of generating (i) a crop map of the current season at a specific point in time (“In season mapping” conventionally at the end of the current year), along with (ii) all intermediate maps during the season able to describe in near real-time the evolution of crop presence (“Dynamic-mapping” at the temporal granularity of satellite imagery revisiting, e. g., 5 days for Sentinel-2 data).

Time Series Time Series Analysis

An Adversarial Generative Network Designed for High-Resolution Monocular Depth Estimation from 2D HiRISE Images of Mars

1 code implementation Remote Sensing 2022 Riccardo La Grassa, Ignazio Gallo, Cristina Re, Gabriele Cremonese, Nicola Landro, Claudio Pernechele, Emanuele Simioni, Mattia Gatti

In this paper, we combine these last two concepts into a single end-to-end model and introduce a new generative adversarial network solution that estimates the DTM at 4× resolution from a single monocular image, called SRDiNet (super-resolution depth image network).

Generative Adversarial Network Monocular Depth Estimation +2

Food Recommendations for Reducing Water Footprint

1 code implementation Sustainability 2022 Ignazio Gallo, Nicola Landro, Riccardo La Grassa, Andrea Turconi

Therefore, in this work, we present a personalized food recommendation scheme, mapping the ingredients to the most resource-friendly dishes on the planet and in particular, selecting recipes that contain ingredients that consume as little water as possible for their production.

Food recommendation Retrieval

Is One Teacher Model Enough to Transfer Knowledge to a Student Model?

1 code implementation Algorithms 2021 Nicola Landro, Ignazio Gallo, Riccardo La Grassa

Nowadays, the transfer learning technique can be successfully applied in the deep learning field through techniques that fine-tune the CNN’s starting point so it may learn over a huge dataset such as ImageNet and continue to learn on a fixed dataset to achieve better performance.

Transfer Learning

Learning to Navigate in the Gaussian Mixture Surface

1 code implementation CAIP: Computer Analysis of Images and Patterns 2021 Riccardo La Grassa, Ignazio Gallo, Nicola Landro

We aim to reduce variances considering many centers per class, using the information from the hidden layers of a deep model, and decreasing the high response from the unnecessary areas of images detected along the baselines.

Navigate

EnGraf-Net: Multiple Granularity Branch Network with Fine-Coarse Graft Grained for Classification Task

1 code implementation CAIP: Computer Analysis of Images and Patterns 2021 Riccardo La Grassa, Ignazio Gallo, Nicola Landro

Fine-Grained classification models can expressly focus on the relevant details useful to distinguish highly similar classes typically when the intra-class variance is high and the inter-class variance is low given a dataset.

Classification Fine-Grained Image Classification

Sentinel 2 Time Series Analysis with 3D Feature Pyramid Network and Time Domain Class Activation Intervals for Crop Mapping

1 code implementation isprs: International Journal of Geo-information 2021 Ignazio Gallo, Riccardo La Grassa, Nicola Landro, Mirco Boschetti

In this paper, we provide an innovative contribution in the research domain dedicated to crop mapping by exploiting the of Sentinel-2 satellite images time series, with the specific aim to extract information on “where and when” crops are grown.

Time Series Time Series Analysis +1

Combining Optimization Methods Using an Adaptive Meta Optimizer

2 code implementations Algorithsm MDPI 2021 Nicola Landro, Ignazio Gallo, Riccardo La Grassa

In our article, we propose the use of the combination of two very different optimizers that, when used simultaneously, can exceed the performance of the single optimizers in very different problems.

Visual Word Embedding for Text Classification

1 code implementation25 Feb 2021 Ignazio Gallo, Shah Nawaz, Nicola Landro, Riccardo La Grassa

The question we answer with this paper is: ‘can we convert a text document into an image to take advantage of image neural models to classify text documents?’ To answer this question we present a novel text classification method that converts a document into an encoded image, using word embedding.

General Classification Image Classification +2

Mixing ADAM and SGD: a Combined Optimization Method

1 code implementation16 Nov 2020 Nicola Landro, Ignazio Gallo, Riccardo La Grassa

Optimization methods (optimizers) get special attention for the efficient training of neural networks in the field of deep learning.

Document Classification Stochastic Optimization +1

$σ^2$R Loss: a Weighted Loss by Multiplicative Factors using Sigmoidal Functions

1 code implementation18 Sep 2020 Riccardo La Grassa, Ignazio Gallo, Nicola Landro

In neural networks, the loss function represents the core of the learning process that leads the optimizer to an approximation of the optimal convergence error.

Learn Class Hierarchy using Convolutional Neural Networks

1 code implementation18 May 2020 Riccardo La Grassa, Ignazio Gallo, Nicola Landro

A large amount of research on Convolutional Neural Networks has focused on flat Classification in the multi-class domain.

Classification General Classification

Can a powerful neural network be a teacher for a weaker neural network?

1 code implementation1 May 2020 Nicola Landro, Ignazio Gallo, Riccardo La Grassa

Is it possible to improve the performance of a weak neural network using the knowledge acquired by a more powerful neural network?

Transfer Learning

Dynamic Decision Boundary for One-class Classifiers applied to non-uniformly Sampled Data

1 code implementation5 Apr 2020 Riccardo La Grassa, Ignazio Gallo, Nicola Landro

A typical issue in Pattern Recognition is the non-uniformly sampled data, which modifies the general performance and capability of machine learning algorithms to make accurate predictions.

One-class classifier

OCmst: One-class Novelty Detection using Convolutional Neural Network and Minimum Spanning Trees

1 code implementation30 Mar 2020 Riccardo La Grassa, Ignazio Gallo, Nicola Landro

We present a novel model called One Class Minimum Spanning Tree (OCmst) for novelty detection problem that uses a Convolutional Neural Network (CNN) as deep feature extractor and graph-based model based on Minimum Spanning Tree (MST).

Novelty Detection

A Classification Methodology based on Subspace Graphs Learning

no code implementations9 Sep 2019 Riccardo La Grassa, Ignazio Gallo, Alessandro Calefati, Dimitri Ognibene

The objective is to select the best structures created during the training phase using an ensemble of spanning trees.

Classification General Classification

Picture What you Read

1 code implementation9 Sep 2019 Ignazio Gallo, Shah Nawaz, Alessandro Calefati, Riccardo La Grassa, Nicola Landro

Visualization refers to our ability to create an image in our head based on the text we read or the words we hear.

Reading Comprehension

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