| Records |
Author  |
Mingyi Yang; Fei Yang; Luka Murn; Marc Gorriz Blanch; Juil Sock; Shuai Wan; Fuzheng Yang; Luis Herranz |
| Title |
Task-Switchable Pre-Processor for Image Compression for Multiple Machine Vision Tasks |
Type |
Journal Article |
| Year |
2024 |
Publication |
IEEE Transactions on Circuits and Systems for Video Technology |
Abbreviated Journal |
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| Keywords |
M Yang, F Yang, L Murn, MG Blanch, J Sock, S Wan, F Yang, L Herranz |
| Abstract |
Visual content is increasingly being processed by machines for various automated content analysis tasks instead of being consumed by humans. Despite the existence of several compression methods tailored for machine tasks, few consider real-world scenarios with multiple tasks. In this paper, we aim to address this gap by proposing a task-switchable pre-processor that optimizes input images specifically for machine consumption prior to encoding by an off-the-shelf codec designed for human consumption. The proposed task-switchable pre-processor adeptly maintains relevant semantic information based on the specific characteristics of different downstream tasks, while effectively suppressing irrelevant information to reduce bitrate. To enhance the processing of semantic information for diverse tasks, we leverage pre-extracted semantic features to modulate the pixel-to-pixel mapping within the pre-processor. By switching between different modulations, multiple tasks can be seamlessly incorporated into the system. Extensive experiments demonstrate the practicality and simplicity of our approach. It significantly reduces the number of parameters required for handling multiple tasks while still delivering impressive performance. Our method showcases the potential to achieve efficient and effective compression for machine vision tasks, supporting the evolving demands of real-world applications. |
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xxx |
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no |
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Admin @ si @ YYM2024 |
Serial |
4007 |
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| Author |
Mingyi Yang; Luis Herranz; Fei Yang; Luka Murn; Marc Gorriz Blanch; Shuai Wan; Fuzheng Yang; Marta Mrak |
| Title |
Semantic Preprocessor for Image Compression for Machines |
Type |
Conference Article |
| Year |
2023 |
Publication |
IEEE International Conference on Acoustics, Speech and Signal Processing |
Abbreviated Journal |
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Pages |
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| Abstract |
Visual content is being increasingly transmitted and consumed by machines rather than humans to perform automated content analysis tasks. In this paper, we propose an image preprocessor that optimizes the input image for machine consumption prior to encoding by an off-the-shelf codec designed for human consumption. To achieve a better trade-off between the accuracy of the machine analysis task and bitrate, we propose leveraging pre-extracted semantic information to improve the preprocessor’s ability to accurately identify and filter out task-irrelevant information. Furthermore, we propose a two-part loss function to optimize the preprocessor, consisted of a rate-task performance loss and a semantic distillation loss, which helps the reconstructed image obtain more information that contributes to the accuracy of the task. Experiments show that the proposed preprocessor can save up to 48.83% bitrate compared with the method without the preprocessor, and save up to 36.24% bitrate compared to existing preprocessors for machine vision. |
| Address |
Rodhes Islands; Greece; June 2023 |
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ICASSP |
| Notes |
MACO; LAMP |
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no |
| Call Number |
Admin @ si @ YHY2023 |
Serial |
3912 |
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| Author |
Miquel Angel Piera; Jose Luis Muñoz; Debora Gil; Gonzalo Martin; Jordi Manzano |
| Title |
A Socio-Technical Simulation Model for the Design of the Future Single Pilot Cockpit: An Opportunity to Improve Pilot Performance |
Type |
Journal Article |
| Year |
2022 |
Publication |
IEEE Access |
Abbreviated Journal |
ACCESS |
| Volume |
10 |
Issue |
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Pages |
22330-22343 |
| Keywords |
Human factors ; Performance evaluation ; Simulation; Sociotechnical systems ; System performance |
| Abstract |
The future deployment of single pilot operations must be supported by new cockpit computer services. Such services require an adaptive context-aware integration of technical functionalities with the concurrent tasks that a pilot must deal with. Advanced artificial intelligence supporting services and improved communication capabilities are the key enabling technologies that will render future cockpits more integrated with the present digitalized air traffic management system. However, an issue in the integration of such technologies is the lack of socio-technical analysis in the design of these teaming mechanisms. A key factor in determining how and when a service support should be provided is the dynamic evolution of pilot workload. This paper investigates how the socio-technical model-based systems engineering approach paves the way for the design of a digital assistant framework by formalizing this workload. The model was validated in an Airbus A-320 cockpit simulator, and the results confirmed the degraded pilot behavioral model and the performance impact according to different contextual flight deck information. This study contributes to practical knowledge for designing human-machine task-sharing systems. |
| Address |
Feb 2022 |
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IAM; |
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no |
| Call Number |
Admin @ si @ PMG2022 |
Serial |
3697 |
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| Author |
Miquel Ferrer |
| Title |
Spectral Median Graphs and its Application to Graphical Symbol Recognition |
Type |
Report |
| Year |
2006 |
Publication |
CVC Technical Report #95 |
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Pages |
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| Address |
CVC (UAB) |
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Approved |
no |
| Call Number |
Admin @ si @ Fer2006 |
Serial |
670 |
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| Author |
Miquel Ferrer |
| Title |
Theory and Algorithms on the Median Graph. Application to Graph-based Classification and Clustering |
Type |
Book Whole |
| Year |
2008 |
Publication |
PhD Thesis, Universitat Autonoma de Barcelona-CVC |
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Pages |
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Thesis |
Ph.D. thesis |
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Editor |
Francesc Serratosa Casanelles;Ernest Valveny |
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Expedition |
978-84-935251-7-0 |
Conference |
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Approved |
no |
| Call Number |
Admin @ si @ Fer2008 |
Serial |
1105 |
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| Author |
Miquel Ferrer; Dimosthenis Karatzas; Ernest Valveny; Horst Bunke |
| Title |
A Recursive Embedding Approach to Median Graph Computation |
Type |
Conference Article |
| Year |
2009 |
Publication |
7th IAPR – TC–15 Workshop on Graph–Based Representations in Pattern Recognition |
Abbreviated Journal |
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| Volume |
5534 |
Issue |
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Pages |
113–123 |
| Keywords |
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| Abstract |
The median graph has been shown to be a good choice to infer a representative of a set of graphs. It has been successfully applied to graph-based classification and clustering. Nevertheless, its computation is extremely complex. Several approaches have been presented up to now based on different strategies. In this paper we present a new approximate recursive algorithm for median graph computation based on graph embedding into vector spaces. Preliminary experiments on three databases show that this new approach is able to obtain better medians than the previous existing approaches. |
| Address |
Venice, Italy |
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Thesis |
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| Publisher |
Springer Berlin Heidelberg |
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LNCS |
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Edition |
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0302-9743 |
ISBN |
978-3-642-02123-7 |
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Conference |
GBR |
| Notes |
DAG |
Approved |
no |
| Call Number |
DAG @ dag @ FKV2009 |
Serial |
1173 |
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| Author |
Miquel Ferrer; Dimosthenis Karatzas; Ernest Valveny; I. Bardaji; Horst Bunke |
| Title |
A Generic Framework for Median Graph Computation based on a Recursive Embedding Approach |
Type |
Journal Article |
| Year |
2011 |
Publication |
Computer Vision and Image Understanding |
Abbreviated Journal |
CVIU |
| Volume |
115 |
Issue |
7 |
Pages |
919-928 |
| Keywords |
Median Graph, Graph Embedding, Graph Matching, Structural Pattern Recognition |
| Abstract |
The median graph has been shown to be a good choice to obtain a represen- tative of a set of graphs. However, its computation is a complex problem. Recently, graph embedding into vector spaces has been proposed to obtain approximations of the median graph. The problem with such an approach is how to go from a point in the vector space back to a graph in the graph space. The main contribution of this paper is the generalization of this previ- ous method, proposing a generic recursive procedure that permits to recover the graph corresponding to a point in the vector space, introducing only the amount of approximation inherent to the use of graph matching algorithms. In order to evaluate the proposed method, we compare it with the set me- dian and with the other state-of-the-art embedding-based methods for the median graph computation. The experiments are carried out using four dif- ferent databases (one semi-artificial and three containing real-world data). Results show that with the proposed approach we can obtain better medi- ans, in terms of the sum of distances to the training graphs, than with the previous existing methods. |
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| Notes |
DAG |
Approved |
no |
| Call Number |
IAM @ iam @ FKV2011 |
Serial |
1831 |
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| Author |
Miquel Ferrer; Ernest Valveny |
| Title |
Combination of OCR Engines for Page Segmentation based on Performance Evaluation |
Type |
Conference Article |
| Year |
2007 |
Publication |
9th International Conference on Document Analysis and Recognition |
Abbreviated Journal |
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| Volume |
2 |
Issue |
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Pages |
784–788 |
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| Address |
Curitiba (Brazil) |
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ICDAR |
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DAG |
Approved |
no |
| Call Number |
DAG @ dag @ FeV2007 |
Serial |
838 |
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| Author |
Miquel Ferrer; Ernest Valveny; F. Serratosa |
| Title |
Spectral Median Graphs Applied to Graphical Symbol Recognition |
Type |
Book Chapter |
| Year |
2006 |
Publication |
11th Iberoamerican Congress on Pattern Recognition (CIARP´06), J.P. Martinez–Trinidad et al. (Eds.), LNCS 4225: 774–783 |
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Pages |
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| Address |
Cancun (Mexico) |
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DAG |
Approved |
no |
| Call Number |
DAG @ dag @ FVS2006b |
Serial |
698 |
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| Author |
Miquel Ferrer; Ernest Valveny; F. Serratosa |
| Title |
Bounding the Size Of the Median Graph |
Type |
Book Chapter |
| Year |
2007 |
Publication |
3rd Iberian Conference on Pattern Recognition and Image Analysis (IbPRIA 2007), J. Marti et al. (Eds.) LNCS 4478(2):491–498 |
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Girona (Spain) |
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DAG |
Approved |
no |
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DAG @ dag @ FVS2007a |
Serial |
788 |
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| Author |
Miquel Ferrer; Ernest Valveny; F. Serratosa |
| Title |
Comparison Between two Spectral-based Methods for Median Graph Computation |
Type |
Book Chapter |
| Year |
2007 |
Publication |
3rd Iberian Conference on Pattern Recognition and Image Analysis (IbPRIA 2007), J. Marti et al. (Eds.) LNCS 4478(2):580–587 |
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Girona (Spain) |
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DAG |
Approved |
no |
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DAG @ dag @ FVS2007b |
Serial |
789 |
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| Author |
Miquel Ferrer; Ernest Valveny; F. Serratosa |
| Title |
A New Optimal Algorithm for the Generalized Median Graph Computation Based on the Maximum Common Subgraph |
Type |
Report |
| Year |
2007 |
Publication |
CVC Technical Report #109 |
Abbreviated Journal |
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Pages |
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| Address |
Bellaterra (Sapin) |
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DAG |
Approved |
no |
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DAG @ dag @ FVS2007c |
Serial |
839 |
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| Author |
Miquel Ferrer; Ernest Valveny; F. Serratosa |
| Title |
Median graph: A new exact algorithm using a distance based on the maximum common subgraph |
Type |
Journal Article |
| Year |
2009 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
| Volume |
30 |
Issue |
5 |
Pages |
579–588 |
| Keywords |
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| Abstract |
Median graphs have been presented as a useful tool for capturing the essential information of a set of graphs. Nevertheless, computation of optimal solutions is a very hard problem. In this work we present a new and more efficient optimal algorithm for the median graph computation. With the use of a particular cost function that permits the definition of the graph edit distance in terms of the maximum common subgraph, and a prediction function in the backtracking algorithm, we reduce the size of the search space, avoiding the evaluation of a great amount of states and still obtaining the exact median. We present a set of experiments comparing our new algorithm against the previous existing exact algorithm using synthetic data. In addition, we present the first application of the exact median graph computation to real data and we compare the results against an approximate algorithm based on genetic search. These experimental results show that our algorithm outperforms the previous existing exact algorithm and in addition show the potential applicability of the exact solutions to real problems. |
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Elsevier Science Inc. |
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Edition |
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| ISSN |
0167-8655 |
ISBN |
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Medium |
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Conference |
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| Notes |
DAG |
Approved |
no |
| Call Number |
DAG @ dag @ FVS2009a |
Serial |
1114 |
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| Author |
Miquel Ferrer; Ernest Valveny; F. Serratosa |
| Title |
Median Graphs: A Genetic Approach based on New Theoretical Properties |
Type |
Journal Article |
| Year |
2009 |
Publication |
Pattern Recognition |
Abbreviated Journal |
PR |
| Volume |
42 |
Issue |
9 |
Pages |
2003–2012 |
| Keywords |
Median graph; Genetic search; Maximum common subgraph; Graph matching; Structural pattern recognition |
| Abstract |
Given a set of graphs, the median graph has been theoretically presented as a useful concept to infer a representative of the set. However, the computation of the median graph is a highly complex task and its practical application has been very limited up to now. In this work we present two major contributions. On one side, and from a theoretical point of view, we show new theoretical properties of the median graph. On the other side, using these new properties, we present a new approximate algorithm based on the genetic search, that improves the computation of the median graph. Finally, we perform a set of experiments on real data, where none of the existing algorithms for the median graph computation could be applied up to now due to their computational complexity. With these results, we show how the concept of the median graph can be used in real applications and leaves the box of the only-theoretical concepts, demonstrating, from a practical point of view, that can be a useful tool to represent a set of graphs. |
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DAG |
Approved |
no |
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DAG @ dag @ FVS2009b |
Serial |
1167 |
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| Author |
Miquel Ferrer; Ernest Valveny; F. Serratosa |
| Title |
Median Graph Computation by means of a Genetic Approach Based on Minimum Common Supergraph and Maximum Common Subraph |
Type |
Conference Article |
| Year |
2009 |
Publication |
4th Iberian Conference on Pattern Recognition and Image Analysis |
Abbreviated Journal |
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| Volume |
5524 |
Issue |
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Pages |
346–353 |
| Keywords |
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| Abstract |
Given a set of graphs, the median graph has been theoretically presented as a useful concept to infer a representative of the set. However, the computation of the median graph is a highly complex task and its practical application has been very limited up to now. In this work we present a new genetic algorithm for the median graph computation. A set of experiments on real data, where none of the existing algorithms for the median graph computation could be applied up to now due to their computational complexity, show that we obtain good approximations of the median graph. Finally, we use the median graph in a real nearest neighbour classification showing that it leaves the box of the only-theoretical concepts and demonstrating, from a practical point of view, that can be a useful tool to represent a set of graphs. |
| Address |
Póvoa de Varzim, Portugal |
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| Publisher |
Springer Berlin Heidelberg |
Place of Publication |
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LNCS |
| Series Volume |
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Series Issue |
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Edition |
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0302-9743 |
ISBN |
978-3-642-02171-8 |
Medium |
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Expedition |
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Conference |
IbPRIA |
| Notes |
DAG |
Approved |
no |
| Call Number |
DAG @ dag @ FVS2009c |
Serial |
1174 |
| Permanent link to this record |
