Video Data Collection How-to - Historique des versions

NicolasSaunier le 5 mai 2025 à 18:46

2025-05-05T18:46:14Z

NicolasSaunier le 22 février 2023 à 20:16

2023-02-22T20:16:32Z

NicolasSaunier : /* Starting the recording */

2022-09-16T18:59:31Z

‎Starting the recording

NicolasSaunier le 15 septembre 2022 à 13:22

2022-09-15T13:22:28Z

NicolasSaunier : /* Site Selection and Choice of Camera Position */

2022-08-26T18:34:15Z

‎Site Selection and Choice of Camera Position

NicolasSaunier : /* Data Management */

2022-06-03T19:13:35Z

‎Data Management

NicolasSaunier : /* Site Selection and Choice of Camera Position */

2022-06-02T13:26:51Z

‎Site Selection and Choice of Camera Position

NicolasSaunier : /* Data Management */

2022-05-25T14:09:50Z

‎Data Management

NicolasSaunier : /* Data Collection with a Regular Camera (visible spectrum), eg Gopro */

2021-06-18T20:05:04Z

‎Data Collection with a Regular Camera (visible spectrum), eg Gopro

NicolasSaunier : /* Data Collection with a Thermal Camera */

2021-06-18T20:04:49Z

‎Data Collection with a Thermal Camera

@@ Ligne 3 : / Ligne 3 : @@
 The list of equipment is available on the [[Equipment]] page.
-=Certification éthique / Ethics Certification (2018-)=
+=Certification éthique / Ethics Certification =
-<blockquote>(Question 10.4 du Formulaire de demande de certification éthique pour un projet de recherche avec des êtres humains) Quelles sont les mesures prévues par le(s) chercheur(s) pour minimiser les inconvénients et les risques?
+Ethics approval must be obtained (completely, not conditionally) from the ethics committee of Polytechnique.
-La résolution spatiale et temporelle des données rend difficile l'identification des personnes, piétons ou utilisateurs de véhicules, y compris par l'intermédiaire des plaques d'immatriculation. L'accès aux données vidéo sera contrôlé et restreint aux seules personnes listées dans ce document, ou des étudiants encadrés par ces personnes. Un soin particulier sera apporté aux illustrations utilisées dans des documents et conférences publiques (et pourront être anonymisées le cas échéant). Les personnes ayant accès à ces données (utilisateur dans la suite, le masculin étant utilisé pour simplifier le texte) devront signer un accord de confidentialité spécifiant les risques associés à ces données (joint à cette demande) et suivre les procédures suivantes:
+Si besoin, un document de confidentialité à signer est disponible [https://docs.google.com/document/d/1EUpv-lX3ZHlegDaSI9wNOMCA5h4peFI1oRtI2c_JHgc/edit?usp=sharing ici].
-* les données seront accessibles sur un ordinateur avec le système d’exploitation Linux dans le local B344 fermé à clef, et l'administrateur de l’ordinateur donnera à chaque utilisateur un compte utilisateur sécurisé par un mot de passe;
-* les données vidéo seront encryptées d'une des deux façons suivantes:
-** le disque de l'ordinateur contenant les données sera encrypté dans sa totalité, et sera déverrouillé lorsque l'utilisateur se connecte à son compte. L'utilisateur devra verrouiller son compte à la fin de sa séance de travail, à la fin de la journée de travail au plus tard;
-** les données vidéo seront contenues dans un répertoire encrypté (outils ecrypt, http://ecryptfs.org/). L'administrateur de l’ordinateur confiera à l'utilisateur un mot de passe. L'utilisateur devra décrypter le répertoire contenant les données vidéo à chaque fois qu'il aura besoin de consulter ou traiter les données vidéo, et re-encrypter le répertoire à la fin de chaque séance de travail, à la fin de la journée de travail au plus tard.
-</blockquote>
-Le document de confidentialité à signer est disponible [https://docs.google.com/document/d/1EUpv-lX3ZHlegDaSI9wNOMCA5h4peFI1oRtI2c_JHgc/edit?usp=sharing ici].
+If needed, the confidentiality agreement to sign is available [https://docs.google.com/document/d/1eJ8HusNBua8oCsojC1pBq86pKODZUR3T7lmbwavOZTI/edit?usp=sharing here].
-−
-The confidentiality agreement to sign is available [https://docs.google.com/document/d/1eJ8HusNBua8oCsojC1pBq86pKODZUR3T7lmbwavOZTI/edit?usp=sharing here].
 =Site Selection and Choice of Camera Position=
 The site should be selected depending on the study objectives and practical consideration to install the camera(s).
 Cameras should be as high as possible to avoid occlusion between road users, and provide the right field of view to capture video about the phenomena of interest. There are two possible ways to install cameras, either on one of the telescopic poles available at Polytechnique that must be attached to existing fixed infrastructure, for example a lamp post, or on existing infrastructure, for example on a balcony or the roof of a building. The first way is described in details below, depending on the type of camera (visible light or infrared).
@@ Ligne 24 : / Ligne 19 : @@
 Another point to take into account when choosing the field of view: one needs to be able to calibrate the camera, ie project the position in the image space to position in real world coordinates. This is done through the identification of at least 4 points (more is better, eg 6-8) that encompass the area of study (ie of which convex hull contains most of the trajectories of the road users that will be analyzed). The calibration is done through a [https://bitbucket.org/Nicolas/trafficintelligence/src/master/docs/camera-calibration.md script in the Traffic Intelligence project].
-Permission has to be asked before putting the cameras. We usually try to get in touch with the responsible person (eg a traffic engineer at the borough/city), but in Montreal, an online form can also be used for temporary requests (https://montreal.ca/demarches/obtenir-un-permis-doccupation-temporaire-du-domaine-public-pour-travaux).
+One must takes notes of the camera setup in the field, with at least the following information for each site and installation:
 =Data Collection with a Regular Camera (visible spectrum), eg Gopro=

← Version précédente		Version du 22 février 2023 à 20:16
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	Don't forget to '''start the recording'''.		Don't forget to '''start the recording'''.
		+
		+	=Health and Safety Management=
		+	Types of risks (probability and consequence of events):
		+	* risk of crash
		+	* risk of hurting oneself during equipment installation and removal

	=Data Management=		=Data Management=

@@ Ligne 92 : / Ligne 92 : @@
 There are several other crucial elements to check in setting the pole and camera:
-* the field of view (what is seen in the camera view)
+* the position of the camera and its field of view (what is seen in the camera view): the camera should be '''as high as possible''' to minimize occlusions
 * the '''camera settings''', in particular
 ** wide field of view
@@ Ligne 101 : / Ligne 101 : @@
 Don't forget to '''start the recording'''.
 =Data Management=

@@ Ligne 52 : / Ligne 52 : @@
 # Pass the strings between the strap and the pole (see picture #11). Crank the buckle to tighten the strap.
 # Lock the mast as attached to the pole with the lock and chain (see picture #12).
 =Data Collection with a Thermal Camera=
@@ Ligne 90 : / Ligne 88 : @@
 #* ''Note: By turning off the camera, you will lose the last 20 minutes of recording. Make sure to film an extra 20 minutes to have the appropriate amount of recording.''
-Don't forget to '''start the recording''' (the resolution should be the maximum and the field of view cannot be changed as far as I know).
+=Starting the recording=
 =Data Management=

← Version précédente		Version du 26 août 2022 à 18:34
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	Cameras should be as high as possible to avoid occlusion between road users, and provide the right field of view to capture video about the phenomena of interest. There are two possible ways to install cameras, either on one of the telescopic poles available at Polytechnique that must be attached to existing fixed infrastructure, for example a lamp post, or on existing infrastructure, for example on a balcony or the roof of a building. The first way is described in details below, depending on the type of camera (visible light or infrared).		Cameras should be as high as possible to avoid occlusion between road users, and provide the right field of view to capture video about the phenomena of interest. There are two possible ways to install cameras, either on one of the telescopic poles available at Polytechnique that must be attached to existing fixed infrastructure, for example a lamp post, or on existing infrastructure, for example on a balcony or the roof of a building. The first way is described in details below, depending on the type of camera (visible light or infrared).
		+
		+	Another point to take into account when choosing the field of view: one needs to be able to calibrate the camera, ie project the position in the image space to position in real world coordinates. This is done through the identification of at least 4 points (more is better, eg 6-8) that encompass the area of study (ie of which convex hull contains most of the trajectories of the road users that will be analyzed). The calibration is done through a [https://bitbucket.org/Nicolas/trafficintelligence/src/master/docs/camera-calibration.md script in the Traffic Intelligence project].

	Permission has to be asked before putting the cameras. We usually try to get in touch with the responsible person (eg a traffic engineer at the borough/city), but in Montreal, an online form can also be used for temporary requests (https://montreal.ca/demarches/obtenir-un-permis-doccupation-temporaire-du-domaine-public-pour-travaux).		Permission has to be asked before putting the cameras. We usually try to get in touch with the responsible person (eg a traffic engineer at the borough/city), but in Montreal, an online form can also be used for temporary requests (https://montreal.ca/demarches/obtenir-un-permis-doccupation-temporaire-du-domaine-public-pour-travaux).

@@ Ligne 91 : / Ligne 91 : @@
 =Data Management=
-The folder structure to store the video data files should follow something similar to: videos/[site]/[yyyy-mm-dd]/ contains all the videos collected at site [site] on day [yyyy-mm-dd]. Please avoid space and accented characters in the files and directory names.
+The folder structure to store the video data files should follow something similar to: videos/[site]/[yyyy-mm-dd]/ contains all the videos collected at site [site] on day [yyyy-mm-dd]. Please avoid space and accented characters in the files and directory names. Here is an example:
-One can consider the metadata Python module in [http://trafficintelligence.confins.net Traffic Intelligence] to store the data. All important information (camera location, particular conditions (roadwork) and site observations) can be manually written in a text file usually called 'info.txt' with the video files.
+'''

← Version précédente		Version du 2 juin 2022 à 13:26
Ligne 21 :		Ligne 21 :

	Cameras should be as high as possible to avoid occlusion between road users, and provide the right field of view to capture video about the phenomena of interest. There are two possible ways to install cameras, either on one of the telescopic poles available at Polytechnique that must be attached to existing fixed infrastructure, for example a lamp post, or on existing infrastructure, for example on a balcony or the roof of a building. The first way is described in details below, depending on the type of camera (visible light or infrared).		Cameras should be as high as possible to avoid occlusion between road users, and provide the right field of view to capture video about the phenomena of interest. There are two possible ways to install cameras, either on one of the telescopic poles available at Polytechnique that must be attached to existing fixed infrastructure, for example a lamp post, or on existing infrastructure, for example on a balcony or the roof of a building. The first way is described in details below, depending on the type of camera (visible light or infrared).
		+
		+	Permission has to be asked before putting the cameras. We usually try to get in touch with the responsible person (eg a traffic engineer at the borough/city), but in Montreal, an online form can also be used for temporary requests (https://montreal.ca/demarches/obtenir-un-permis-doccupation-temporaire-du-domaine-public-pour-travaux).

	=Data Collection with a Regular Camera (visible spectrum), eg Gopro=		=Data Collection with a Regular Camera (visible spectrum), eg Gopro=

← Version précédente		Version du 25 mai 2022 à 14:09
Ligne 89 :		Ligne 89 :

	=Data Management=		=Data Management=
−	The folder structure to store the video data files should follow something similar to: videos/[site]/[yyyy-mm-dd]/ contains all the videos collected at site [site] on day [yyyy-mm-dd]. One can consider the metadata Python module in [http://trafficintelligence.confins.net Traffic Intelligence] to store the data. All important information (camera location, particular conditions (roadwork) and site observations) can be manually written in a text file usually called 'info.txt' with the video files.	+	The folder structure to store the video data files should follow something similar to: videos/[site]/[yyyy-mm-dd]/ contains all the videos collected at site [site] on day [yyyy-mm-dd]. Please avoid space and accented characters in the files and directory names.
		+
		+	One can consider the metadata Python module in [http://trafficintelligence.confins.net Traffic Intelligence] to store the data. All important information (camera location, particular conditions (roadwork) and site observations) can be manually written in a text file usually called 'info.txt' with the video files.

@@ Ligne 37 : / Ligne 37 : @@
 #* ''Note #1'': in case of rain, make sure to put a piece of tape on top and on the back of the GoPro, to protect the camera.
 #* ''Note #2'': Turn the rope around the mast to stabilize it, eg in case of wind.
 #* '''Warning''': add plastic and tape to waterproof the camera if rain is scheduled.
 # Tie the rope around the base of the GoPro and tighten (see picture #5).
 # Put the mast along the pole, eg a lamppost, from where you want to make your observations from (see picture #6). There should be two separate strings of rope going from the GoPro to the ground.

@@ Ligne 53 : / Ligne 53 : @@
 =Data Collection with a Thermal Camera=
-The steps can be seen in the following '''[https://www.youtube.com/playlist?list=PLirgEn6IPLXs2J2N7_cI6Jp-1Kgcy_uQb videos]''' ('''[https://bitbucket.org/Nicolas/trafficintelligence/src/master/docs/how-to-collect-thermal-video.docx pictures 2 to 15]'''). Beforehand, one needs to:
+The steps can be seen in the following '''[https://www.youtube.com/playlist?list=PLirgEn6IPLXs2J2N7_cI6Jp-1Kgcy_uQb videos]''' ('''[https://bitbucket.org/Nicolas/trafficintelligence/src/master/docs/how-to-collect-thermal-video.docx photos 2 to 15]'''). Beforehand, one needs to:
 # charge the batteries;
 # make sure the memory cards are empty (the files have been stored on one of the computers at Polytechnique.