Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Nov 25, 2021
This paper proposes a new method of features extraction for handwritten, printed and isolated num... more This paper proposes a new method of features extraction for handwritten, printed and isolated numeral recognition. It is essential today for a company to store its data in an encrypted way when it uses Cloud Computing. However, the manipulation of this encrypted data remains complex, and it is very difficult in this case to be able to share the encrypted data between different users. One of the solutions for sharing encrypted data is to use PRE (Proxy Reencryption) which allows both the re-encryption of the data, but also the delegation of this operation by a third party via the use of a specific key. In this article, we propose a solution for sharing encrypted files between users that uses a classic storage system in the Cloud and PRE (re-encryption PRoxy). We present an improvement of an existing PRE algorithm by applying it to elliptical curves in order to improve its performance. Finally, we implement this architecture in the form of a cloud service called PREaaS (PRE as a Service) which allows this mechanism to be used on demand with an API.
Le Centre pour la Communication Scientifique Directe - HAL - Inria, Jul 5, 2022
La confidentialité des données est devenue aujourd'hui essentielle mais chiffrer les données dire... more La confidentialité des données est devenue aujourd'hui essentielle mais chiffrer les données directement par les utilisateurs reste difficile. De plus, la problématique du partage de fichiers est souvent inexistante ou mal gérée. En effet, les outils qui le permettent utilisent majoritairement un chiffrement asymétrique peu performant ni très simple d'utilisation. Dans cet article nous proposons de résoudre le problème du partage de fichiers en utilisant les PRE (Proxy Re-Encryption) qui permettent le re-chiffrement des données par un tiers via une clé de re-chiffrement. Nous proposons également d'améliorer les problèmes de performance en modifiant un algorithme PRE existant utilisant des courbes elliptiques. Nous proposons une implémentation de notre solution PRE en tant que service (PREaaS) utilisable à la demande et en complément d'un service de stockage existant.
Proceedings of the 6th International Conference on Information Systems Security and Privacy, 2020
Secure Data sharing has become an ubiquitous need. One way of pursuing it is to use Proxy Re-Encr... more Secure Data sharing has become an ubiquitous need. One way of pursuing it is to use Proxy Re-Encryption (PRE), which allows delegation of decryption rights selectively. This work tackles the problem of designing a Proxy Re-Encryption that is unidirectional and CCA-secure in the standard model without pairings. In (Zhang et al., 2013) they propose a solution that makes the Cramer-Shoup encryption scheme publicly verifiable and use their result to construct a CCA secure PRE in the standard model. However, we show that their scheme is vulnerable against adaptive chosen ciphertexts attacks. Then we propose a new construction based on Cramer-Shoup crypto-system (Cramer and Shoup, 1998), that is CCA secure without pairings nor random oracle.
Proceedings 1999 IEEE/RSJ International Conference on Intelligent Robots and Systems. Human and Environment Friendly Robots with High Intelligence and Emotional Quotients (Cat. No.99CH36289)
An omnidirectional range sensor is reported. This active vision sensor combines a CCD camera and ... more An omnidirectional range sensor is reported. This active vision sensor combines a CCD camera and a laser diode. We use two methods to obtain the depth of the scene: a calibration method and a least square method. We describe the prototype we made. Experimental results are presented. A comparative test shows that this sensor seems to be as accurate as
Proceedings 2002 IEEE International Conference on Robotics and Automation (Cat. No.02CH37292)
This paper deals with the localization and map building paradigm in an unknown indoor environment... more This paper deals with the localization and map building paradigm in an unknown indoor environment. We propose an exploration method based on the use of the sensorial data provided by an omnidirectional stereoscopic vision system. First, we link the problem of sensorial model construction with two omnidirectional images. We propose an approach based on the fusion of several criteria, which
We will present in this article the principles of data-processing put into operation within the f... more We will present in this article the principles of data-processing put into operation within the framework of a research project on the improvement of automobile safety. This project is based on the simultaneous use of two systems of exteroceptive perception: a system of omnidirectional vision with spherical reflector and a telemetric laser. We limit our study to the identification of
Dans cet article, nous presentons deux methodes de localisation basees sur l'utilisation du c... more Dans cet article, nous presentons deux methodes de localisation basees sur l'utilisation du capteur omnidirectionnel SYCLOP. La premiere methode, statique, consiste a rechercher la configuration du robot d'une maniere absolue par la mise en correspondance d'une image reelle avec une base d'images panoramiques synthetiques. Cette base est obtenue grâce a la modelisation et la calibration du capteur SYCLOP. La deuxieme methode, dynamique, est basee sur de la poursuite multi-cibles. L'originalite de cette methode reside dans sa capacite a gerer et propager des incertitudes durant le processus de localisation. Cette propagation multi-niveaux d'incertitudes est basee sur l'utilisation de la theorie de Dempster Shafer. Dans ce travail, SYCLOP est associe a un capteur de profondeur. Ceci permet de traiter des donnees a la fois complementaires et redondantes et donc de construire un modele sensoriel robuste integrant un nombre important de primitives significativ...
Proceedings IEEE Workshop on Omnidirectional Vision (Cat. No.PR00704), 2000
In this paper, we present experimental results obtained with the omnidirectional sensor SYCLOP “C... more In this paper, we present experimental results obtained with the omnidirectional sensor SYCLOP “Conical SYstem for LOcalization and Perception” for localisation of mobile robots. This system, which is able to get a panoramic view of a 2π radian field, is made of a CCD camera and a vertically oriented conic shaped reflector. We give at first a method to calibrate
... param tres des primitives cartographiques au sens des moindres carr s. Le crit re d cisionnel... more ... param tres des primitives cartographiques au sens des moindres carr s. Le crit re d cisionnel est gr avec la th orie des croyances de ... Save reference to library · Related research 3 readers. Estimation de la Position d'un Robot par Odom trie et Vision Monoculaire. F Chenavier, IL ...
In this paper, we present experimental results obtained with the omnidirectional sensor SYCLOP “C... more In this paper, we present experimental results obtained with the omnidirectional sensor SYCLOP “Conical SYstem for LOcalization and Perception” for localisation of mobile robots. This system, which is able to get a panoramic view of a 2π radian field, is made of a CCD camera and a vertically oriented conic shaped reflector. We give at first a method to calibrate
Proceedings 1999 IEEE/RSJ International Conference on Intelligent Robots and Systems. Human and Environment Friendly Robots with High Intelligence and Emotional Quotients (Cat. No.99CH36289), 1999
This paper presents a system of absolute localization based on the cooperation of a stereoscopic ... more This paper presents a system of absolute localization based on the cooperation of a stereoscopic omnidirectional vision system and a dead-reckoning system. To do it we use an original perception system which allows our omnidirectional vision sensor SYCLOP to move along a rail. The first part of our study will deal with the problem of building the sensorial model with the help of the two stereoscopic omnidirectional images. To solve this problem we propose an approach based on the fusion of several criteria which will be made according to Dempster-Shafer rules. As for the second part, it will be devoted to exploiting this sensorial model to localize the robot thanks to matching the sensorial primitives with the environment map. We use the dead-reckoning prediction to decrease the combinatory aspect of the matching algorithm. We analyze the performance of our global absolute localization system on several robot's elementary moves, in an indoor environment.
In this article, a dynamic localization method based on multi-target tracking is presented. The o... more In this article, a dynamic localization method based on multi-target tracking is presented. The originality of this method is its capability to manage and propagate uncertainties during the localization process. This multi-level uncertainty propagation stage is based on the use of the Dempster-Shafer theory. The perception system we use is composed of an omnidirectional vision system and a panoramic range finder. It enables us to treat complementary and redundant data and thus to construct a robust sensorial model which integrates an important number of significant primitives. Based on this model, we treat the problem of maintaining a matching and propagating uncertainties on each matched primitive in order to obtain a global uncertainty about the robot configuration.
The formulation of many practical problems naturally involves constraints on the variables enteri... more The formulation of many practical problems naturally involves constraints on the variables entering the mathematical model of a real-life situation to be analyzed. It is of great interest to find the possible scenarios satisfying all constraints, and, if there are many of them, either to find the best solution, or to obtain a compact, explicit representation of the whole feasible set.
This article deals the problem of data fusion applied to road safety by proposing a solution base... more This article deals the problem of data fusion applied to road safety by proposing a solution based on a multi-level approach allowing the exploitation of additional and redundant data which emanate from two systems of perception: an omnidirectional vision sensor and a rangefinder laser. The first part concerns the processing of sensory data stemming from both sensors allowing the extraction
2008 First Workshops on Image Processing Theory, Tools and Applications, 2008
ABSTRACT A research sector mattering in the medical environment, concerns the study of the neovas... more ABSTRACT A research sector mattering in the medical environment, concerns the study of the neovascularization mechanisms from pre-existing capillary vessels: Angiogenesis. These researches are very important because they correspond to many physiological but also pathological processes: in particular the growth of tumors and the development of the metastases. In this paper we are interested in the particular case of chemotaxis in the field of the angiogenesis. Indeed studies show that according to molecules applied to tumors, the capillary and other vessels develop less quickly, and can be stopped. It allows to reduce the supply to blood nutriments of the tumor and eventually to provoke its degeneration. The study proposed in this paper shows a first application on this subject with a study on in vitro cultures of umbilical cells. During a voluntary incision in a culture of blood cells, and the injection of specific molecules on this wound, we determine the healing speed. The longer the healing time is, the more effective the molecule is. The image analysis that we propose here concerns the detection of blood cells in plate and the detection of the realized incision. The created software of images treatment and the reference images are available on the following site: /www.rteam.iut-amiens.fr/angioscin/.
2006 1ST IEEE International Conference on E-Learning in Industrial Electronics, 2006
ABSTRACT This paper deals with omnidirectional vision sensor. Through, the experience accumulates... more ABSTRACT This paper deals with omnidirectional vision sensor. Through, the experience accumulates in our team, we want to evocate with the help of this conference, how omnidirectional vision sensors are useful in many applications. Such kinds of mirrors are not new and they were used for painting in the past. We will thus first propose a quick main history facts and then deal with some research project achieved in our group. The main purpose of this paper is not to focus on such or such processing but to give a general idea of what is it possible to handle with an omnidirectional vision system of perception
Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C), 1999
This paper presents a system of absolute localization based on the stereoscopic omnidirectional v... more This paper presents a system of absolute localization based on the stereoscopic omnidirectional vision. To do it we use an original perception system which allows our omnidirectional vision sensor SYCLOP to move along a rail. The first part of our study will deal with the problem of building the sensorial model with the help of the two stereoscopic omnidirectional images. To solve this problem we propose an approach based on the fusion of several criteria which will be made according to Dempster-Shafer rules. As for the second part, it will be devoted to exploiting this sensorial model to localize the robot thanks to matching the sensorial primitives with the environment map. We analyze the performance of our global absolute localization system on several robot's elementary moves, in different environments.
Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Nov 25, 2021
This paper proposes a new method of features extraction for handwritten, printed and isolated num... more This paper proposes a new method of features extraction for handwritten, printed and isolated numeral recognition. It is essential today for a company to store its data in an encrypted way when it uses Cloud Computing. However, the manipulation of this encrypted data remains complex, and it is very difficult in this case to be able to share the encrypted data between different users. One of the solutions for sharing encrypted data is to use PRE (Proxy Reencryption) which allows both the re-encryption of the data, but also the delegation of this operation by a third party via the use of a specific key. In this article, we propose a solution for sharing encrypted files between users that uses a classic storage system in the Cloud and PRE (re-encryption PRoxy). We present an improvement of an existing PRE algorithm by applying it to elliptical curves in order to improve its performance. Finally, we implement this architecture in the form of a cloud service called PREaaS (PRE as a Service) which allows this mechanism to be used on demand with an API.
Le Centre pour la Communication Scientifique Directe - HAL - Inria, Jul 5, 2022
La confidentialité des données est devenue aujourd'hui essentielle mais chiffrer les données dire... more La confidentialité des données est devenue aujourd'hui essentielle mais chiffrer les données directement par les utilisateurs reste difficile. De plus, la problématique du partage de fichiers est souvent inexistante ou mal gérée. En effet, les outils qui le permettent utilisent majoritairement un chiffrement asymétrique peu performant ni très simple d'utilisation. Dans cet article nous proposons de résoudre le problème du partage de fichiers en utilisant les PRE (Proxy Re-Encryption) qui permettent le re-chiffrement des données par un tiers via une clé de re-chiffrement. Nous proposons également d'améliorer les problèmes de performance en modifiant un algorithme PRE existant utilisant des courbes elliptiques. Nous proposons une implémentation de notre solution PRE en tant que service (PREaaS) utilisable à la demande et en complément d'un service de stockage existant.
Proceedings of the 6th International Conference on Information Systems Security and Privacy, 2020
Secure Data sharing has become an ubiquitous need. One way of pursuing it is to use Proxy Re-Encr... more Secure Data sharing has become an ubiquitous need. One way of pursuing it is to use Proxy Re-Encryption (PRE), which allows delegation of decryption rights selectively. This work tackles the problem of designing a Proxy Re-Encryption that is unidirectional and CCA-secure in the standard model without pairings. In (Zhang et al., 2013) they propose a solution that makes the Cramer-Shoup encryption scheme publicly verifiable and use their result to construct a CCA secure PRE in the standard model. However, we show that their scheme is vulnerable against adaptive chosen ciphertexts attacks. Then we propose a new construction based on Cramer-Shoup crypto-system (Cramer and Shoup, 1998), that is CCA secure without pairings nor random oracle.
Proceedings 1999 IEEE/RSJ International Conference on Intelligent Robots and Systems. Human and Environment Friendly Robots with High Intelligence and Emotional Quotients (Cat. No.99CH36289)
An omnidirectional range sensor is reported. This active vision sensor combines a CCD camera and ... more An omnidirectional range sensor is reported. This active vision sensor combines a CCD camera and a laser diode. We use two methods to obtain the depth of the scene: a calibration method and a least square method. We describe the prototype we made. Experimental results are presented. A comparative test shows that this sensor seems to be as accurate as
Proceedings 2002 IEEE International Conference on Robotics and Automation (Cat. No.02CH37292)
This paper deals with the localization and map building paradigm in an unknown indoor environment... more This paper deals with the localization and map building paradigm in an unknown indoor environment. We propose an exploration method based on the use of the sensorial data provided by an omnidirectional stereoscopic vision system. First, we link the problem of sensorial model construction with two omnidirectional images. We propose an approach based on the fusion of several criteria, which
We will present in this article the principles of data-processing put into operation within the f... more We will present in this article the principles of data-processing put into operation within the framework of a research project on the improvement of automobile safety. This project is based on the simultaneous use of two systems of exteroceptive perception: a system of omnidirectional vision with spherical reflector and a telemetric laser. We limit our study to the identification of
Dans cet article, nous presentons deux methodes de localisation basees sur l'utilisation du c... more Dans cet article, nous presentons deux methodes de localisation basees sur l'utilisation du capteur omnidirectionnel SYCLOP. La premiere methode, statique, consiste a rechercher la configuration du robot d'une maniere absolue par la mise en correspondance d'une image reelle avec une base d'images panoramiques synthetiques. Cette base est obtenue grâce a la modelisation et la calibration du capteur SYCLOP. La deuxieme methode, dynamique, est basee sur de la poursuite multi-cibles. L'originalite de cette methode reside dans sa capacite a gerer et propager des incertitudes durant le processus de localisation. Cette propagation multi-niveaux d'incertitudes est basee sur l'utilisation de la theorie de Dempster Shafer. Dans ce travail, SYCLOP est associe a un capteur de profondeur. Ceci permet de traiter des donnees a la fois complementaires et redondantes et donc de construire un modele sensoriel robuste integrant un nombre important de primitives significativ...
Proceedings IEEE Workshop on Omnidirectional Vision (Cat. No.PR00704), 2000
In this paper, we present experimental results obtained with the omnidirectional sensor SYCLOP “C... more In this paper, we present experimental results obtained with the omnidirectional sensor SYCLOP “Conical SYstem for LOcalization and Perception” for localisation of mobile robots. This system, which is able to get a panoramic view of a 2π radian field, is made of a CCD camera and a vertically oriented conic shaped reflector. We give at first a method to calibrate
... param tres des primitives cartographiques au sens des moindres carr s. Le crit re d cisionnel... more ... param tres des primitives cartographiques au sens des moindres carr s. Le crit re d cisionnel est gr avec la th orie des croyances de ... Save reference to library · Related research 3 readers. Estimation de la Position d'un Robot par Odom trie et Vision Monoculaire. F Chenavier, IL ...
In this paper, we present experimental results obtained with the omnidirectional sensor SYCLOP “C... more In this paper, we present experimental results obtained with the omnidirectional sensor SYCLOP “Conical SYstem for LOcalization and Perception” for localisation of mobile robots. This system, which is able to get a panoramic view of a 2π radian field, is made of a CCD camera and a vertically oriented conic shaped reflector. We give at first a method to calibrate
Proceedings 1999 IEEE/RSJ International Conference on Intelligent Robots and Systems. Human and Environment Friendly Robots with High Intelligence and Emotional Quotients (Cat. No.99CH36289), 1999
This paper presents a system of absolute localization based on the cooperation of a stereoscopic ... more This paper presents a system of absolute localization based on the cooperation of a stereoscopic omnidirectional vision system and a dead-reckoning system. To do it we use an original perception system which allows our omnidirectional vision sensor SYCLOP to move along a rail. The first part of our study will deal with the problem of building the sensorial model with the help of the two stereoscopic omnidirectional images. To solve this problem we propose an approach based on the fusion of several criteria which will be made according to Dempster-Shafer rules. As for the second part, it will be devoted to exploiting this sensorial model to localize the robot thanks to matching the sensorial primitives with the environment map. We use the dead-reckoning prediction to decrease the combinatory aspect of the matching algorithm. We analyze the performance of our global absolute localization system on several robot's elementary moves, in an indoor environment.
In this article, a dynamic localization method based on multi-target tracking is presented. The o... more In this article, a dynamic localization method based on multi-target tracking is presented. The originality of this method is its capability to manage and propagate uncertainties during the localization process. This multi-level uncertainty propagation stage is based on the use of the Dempster-Shafer theory. The perception system we use is composed of an omnidirectional vision system and a panoramic range finder. It enables us to treat complementary and redundant data and thus to construct a robust sensorial model which integrates an important number of significant primitives. Based on this model, we treat the problem of maintaining a matching and propagating uncertainties on each matched primitive in order to obtain a global uncertainty about the robot configuration.
The formulation of many practical problems naturally involves constraints on the variables enteri... more The formulation of many practical problems naturally involves constraints on the variables entering the mathematical model of a real-life situation to be analyzed. It is of great interest to find the possible scenarios satisfying all constraints, and, if there are many of them, either to find the best solution, or to obtain a compact, explicit representation of the whole feasible set.
This article deals the problem of data fusion applied to road safety by proposing a solution base... more This article deals the problem of data fusion applied to road safety by proposing a solution based on a multi-level approach allowing the exploitation of additional and redundant data which emanate from two systems of perception: an omnidirectional vision sensor and a rangefinder laser. The first part concerns the processing of sensory data stemming from both sensors allowing the extraction
2008 First Workshops on Image Processing Theory, Tools and Applications, 2008
ABSTRACT A research sector mattering in the medical environment, concerns the study of the neovas... more ABSTRACT A research sector mattering in the medical environment, concerns the study of the neovascularization mechanisms from pre-existing capillary vessels: Angiogenesis. These researches are very important because they correspond to many physiological but also pathological processes: in particular the growth of tumors and the development of the metastases. In this paper we are interested in the particular case of chemotaxis in the field of the angiogenesis. Indeed studies show that according to molecules applied to tumors, the capillary and other vessels develop less quickly, and can be stopped. It allows to reduce the supply to blood nutriments of the tumor and eventually to provoke its degeneration. The study proposed in this paper shows a first application on this subject with a study on in vitro cultures of umbilical cells. During a voluntary incision in a culture of blood cells, and the injection of specific molecules on this wound, we determine the healing speed. The longer the healing time is, the more effective the molecule is. The image analysis that we propose here concerns the detection of blood cells in plate and the detection of the realized incision. The created software of images treatment and the reference images are available on the following site: /www.rteam.iut-amiens.fr/angioscin/.
2006 1ST IEEE International Conference on E-Learning in Industrial Electronics, 2006
ABSTRACT This paper deals with omnidirectional vision sensor. Through, the experience accumulates... more ABSTRACT This paper deals with omnidirectional vision sensor. Through, the experience accumulates in our team, we want to evocate with the help of this conference, how omnidirectional vision sensors are useful in many applications. Such kinds of mirrors are not new and they were used for painting in the past. We will thus first propose a quick main history facts and then deal with some research project achieved in our group. The main purpose of this paper is not to focus on such or such processing but to give a general idea of what is it possible to handle with an omnidirectional vision system of perception
Proceedings 1999 IEEE International Conference on Robotics and Automation (Cat. No.99CH36288C), 1999
This paper presents a system of absolute localization based on the stereoscopic omnidirectional v... more This paper presents a system of absolute localization based on the stereoscopic omnidirectional vision. To do it we use an original perception system which allows our omnidirectional vision sensor SYCLOP to move along a rail. The first part of our study will deal with the problem of building the sensorial model with the help of the two stereoscopic omnidirectional images. To solve this problem we propose an approach based on the fusion of several criteria which will be made according to Dempster-Shafer rules. As for the second part, it will be devoted to exploiting this sensorial model to localize the robot thanks to matching the sensorial primitives with the environment map. We analyze the performance of our global absolute localization system on several robot's elementary moves, in different environments.
Uploads
Papers by C. Drocourt