EP4507928A1 - Procede de commande d'une tete optique destinee a etre utilisee dans un systeme d'observation d'un individu - Google Patents
Procede de commande d'une tete optique destinee a etre utilisee dans un systeme d'observation d'un individuInfo
- Publication number
- EP4507928A1 EP4507928A1 EP23717527.8A EP23717527A EP4507928A1 EP 4507928 A1 EP4507928 A1 EP 4507928A1 EP 23717527 A EP23717527 A EP 23717527A EP 4507928 A1 EP4507928 A1 EP 4507928A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical head
- characteristic
- control unit
- supply current
- threshold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/59—Context or environment of the image inside of a vehicle, e.g. relating to seat occupancy, driver state or inner lighting conditions
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/141—Control of illumination
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/143—Sensing or illuminating at different wavelengths
Definitions
- the present invention relates to a method for controlling an optical head intended to be used in a system for observing an individual located inside the passenger compartment of a vehicle.
- the present invention proposes a method for controlling an optical head intended to be used in a system for observing an individual located inside a passenger compartment of a vehicle, said method using a control unit arranged to power said optical head with a supply current, said method comprising at least one iteration of the following steps:
- the control of the optical head is directly based on a measurement and a comparison of the power supply signal with a limit value.
- No other analysis techniques are used, for example, no image processing is used for (illuminance) control of the optical head.
- the method is therefore very simple to implement, easy to implement and inexpensive in terms of calculation time.
- the at least one characteristic relates to a duration of application and the limit value is a first threshold, the stopping step being configured to engage when the at least one characteristic is greater than the first threshold.
- the first threshold is less than or equal to 6 milliseconds.
- an additional characteristic relating to an intensity of the supply current, is measured in the measurement step, the stopping step being configured to engage as soon as the at unless a characteristic reaches the first threshold or as soon as the additional characteristic is greater than a second threshold.
- the second threshold is less than or equal to 10 amps.
- the at least one characteristic relates to an intensity of the supply current and the limit value is a second threshold, the stopping step being configured to engage when the at least one least one characteristic is greater than the second threshold
- the second threshold is less than or equal to 10 amps.
- said vehicle comprises a starting system, said method comprising, prior to the measuring step, a step of switching on said optical head each time said starting system is powered up.
- the process is repeated each time the starting system is powered up.
- the method comprises an additional stopping step each time the starting system of said vehicle is turned off.
- the invention also proposes a control unit for an optical head intended to be used in a system for observing an individual located inside a passenger compartment of a vehicle, said control unit including:
- a measuring module arranged to measure at least one characteristic of a supply current of said optical head, preferably said at least one characteristic relating to a duration of application of the supply current or to a duration during which the supply current is greater than a minimum value or intensity of the supply current;
- an analysis module arranged to analyze the at least one characteristic by comparing the at least one characteristic to a limit value
- an on/off module arranged to stop a supply of the optical head power supply current when the at least one characteristic is greater than said limit value.
- control unit thus makes it possible to centrally manage the control of the optical head.
- the control unit therefore has advantages similar to those developed for the method according to the invention.
- control module is no longer positioned in the optical head, which makes it possible to considerably reduce the volume of the optical head.
- the optical head is more easily integrated into vehicles and adaptable to the needs of use and layout of the vehicle.
- control unit carry out operations that are simple to implement.
- control unit uses few components and these components are standard components.
- the arrangement of the control unit is also easier to implement.
- the on/off module comprises a switch comprising two operating states, a closed state and an open state, said switch being arranged to go into the open state after receiving a stop command from the analysis module to stop the supply of the supply current to the optical head.
- the vehicle comprises a starting system, the on/off module being arranged to start supplying the supply current to the optical head each time said starting system is powered up and to stop the supply of supply current each time said starting system is de-energized.
- the measurement module comprises a conversion module configured to convert said supply current into an electrical voltage and a digitization module configured to digitize said electrical voltage, said digitized electrical voltage being transmitted to the analysis module.
- control system comprising:
- an optical head comprising a light source, preferably pulsed
- the system according to the invention is therefore more compact than the systems of the state of the art because the modules participating in the control of the optical head are all positioned at the level of the control unit (calculation unit ) of the system.
- the optical head is very compact and can be modulated to the needs of the individual and the vehicle.
- a standard optical head can be used in the system according to the invention, which limits the costs for this component.
- the system is also easy to implement, because the operations carried out by the various components are easy to arrange and use standard components.
- the light source is a pulse source.
- the light source is an Infra-Red source.
- the optical head comprises a sensor arranged to acquire at least one image of said individual when said individual is illuminated by said light source.
- FIG. 1 is a schematic representation of a first embodiment of a method according to the invention
- FIG. 2 is a schematic representation of a second embodiment of a method according to the invention when a vehicle starting system is powered up;
- FIG. 3 is a schematic representation of the second embodiment of the method according to the invention when the starting system of a vehicle is de-energized;
- FIG. 4 is a schematic representation of a new iteration of the second embodiment of the method according to the invention when the starting system of a vehicle is energized again;
- FIG. 5 is a schematic representation of a first embodiment of a control unit according to the invention.
- FIG. 6 is a schematic representation of a second embodiment of a control unit according to the invention.
- FIG. 7 is a schematic representation of a system according to the invention.
- FIG. 8 is a schematic representation of a power signal measured by a measuring unit belonging to a control unit according to the invention.
- FIG. 9 is a schematic representation of an example of a light signal emitted by a light source of an optical head belonging to a system according to the invention.
- Figure 1 illustrates a first example of carrying out a method according to the present disclosure.
- Figure 1 illustrates a method 100 for controlling an optical head intended to be used in a system for observing an individual located inside the passenger compartment of a vehicle.
- the method 100 uses a control unit arranged to power the optical head with a supply current.
- supply current we mean a current necessary for the operation of the optical head.
- This supply current is preferably supplied to the optical head to power it in order to operate said optical head. Since the supply current is relative to an electrical signal, the supply current can be defined by parameters defining the supply current signal. These parameters can be relative to a time, an intensity.
- the optical head comprises a light source arranged to illuminate the individual. The supply current is therefore also used to power the light source of the optical head.
- the method 100 comprises a step 102 of measuring, by the control unit, at least one characteristic of the supply current.
- the characteristic of the supply current may relate to a duration of application of the supply current or to a duration during which the supply current is greater than a minimum value and/or an intensity of the supply current.
- the minimum value is relative to a residual supply current.
- the minimum value may be 0.5 amps.
- the duration of application of the supply current can be proportional to the duration during which the individual is illuminated by the optical head.
- the duration of application of the current corresponds to a pulse duration of the light source of the optical head or to a duration during which the individual is illuminated by the optical head.
- the signal representing the supply current is not zero and is preferably in the form of a peak at a high state.
- the intensity of the supply current is preferably proportional to the light intensity emitted by the optical head, preferably by the light source of the optical head.
- the higher the intensity of the supply current the more the optical head, preferably the light source of the optical head, generates a high light emission power.
- the light signal emitted by the optical head is therefore higher.
- the at least one characteristic relates to light power.
- the method 100 further comprises a step 104 of analysis, by the control unit, of the at least one characteristic by comparison of the at least one characteristic to a limit value.
- at least one characteristic of the supply current is extracted in order to be compared with the limit value.
- the method 100 then comprises a step 106 of stopping, by the control unit, a supply of the power supply current to the optical head when the at least one characteristic is greater than the limit value. So if at least one characteristic is greater than the limit value, then the power supply to the optical head is stopped. No power current is supplied to the optical head. Otherwise, power to the optical head is maintained. For example, stopping the supply of power current to the optical head is initiated by the control unit which issues a stop command to stop powering the optical head.
- the method 100 thus describes a method for controlling the optical head making it possible to control the operation of the optical head in order to guarantee safety conditions for the individual observed by the optical head. Indeed, according to the method according to the invention, stopping or continuing the power supply to the optical head is based on a comparison of at least one parameter of the supply current with the limit value. No computationally expensive techniques, for example image processing techniques, are used by the method 100. The method 100 is therefore easy to implement.
- the measuring step 102 is configured to measure the characteristic relating to the duration of application of the supply current or a duration during which the supply current is greater than a minimum value of the supply current.
- the limit value is associated with a first threshold.
- the First threshold can be chosen in a range between 0.1 millisecond (ms) to 6 milliseconds. Preferably, the first threshold is set at 6 milliseconds. Such a threshold makes it possible both to guarantee a better level of comfort, for example visual comfort, and also a better level of security, for example a high level of visual security. Comfort and safety are therefore improved.
- the measuring step 102 is configured to measure the characteristic relating to an intensity of the supply current.
- the limit value is associated with a second threshold.
- the second threshold can be chosen in a range between 0.1 milliampere (mA) to 10 amps (A).
- the second threshold is set at 10 amps.
- the measuring step 102 is configured to measure at least one characteristic relating to the duration of application of the supply current or a duration during which the supply current is greater than at a minimum value of the supply current and an additional characteristic relating to the intensity of the supply current.
- two characteristics of the supply current are measured, preferably simultaneously, by the control unit.
- the two parameters are the duration of application of the supply current or duration during which the supply current is greater than a minimum value of the supply current as well as the intensity of the supply current.
- the additional characteristic is compared to the second threshold (threshold identical to the second embodiment) while the characteristic relating to the duration is compared to the first threshold (threshold identical to the first embodiment).
- the stopping step 106 is initiated when one of the two characteristics measured in the measuring step 102 reaches its respective threshold, that is to say as soon as the first threshold or the second threshold is reached.
- the control unit stops supplying the optical head with the supply current.
- the measurement 102, analysis 104 and stopping 106 steps can be repeated several times. Thus, it is possible to restart process 100.
- the method 100 is also a method for controlling an optical head intended to be used in a system for observing several individuals located at the interior of a vehicle cabin.
- Figures 2, 3, 4 illustrate a second example of a method 200 according to the present disclosure.
- the process 200 includes all the steps of the process 100 so only the differences with the process 100 illustrated in Figure 1 will be described.
- the method 200 further comprises an engagement step 202 carried out before the measurement step 102.
- the engagement step 202 makes it possible to activate the optical head.
- the optical head is thus powered.
- the start-up step 202 is activated each time the start-up system is powered up.
- powering on is noted ON-O while powering off is noted OFF-0.
- ON-O switching on can, for example, correspond to switching on the vehicle battery by engaging the key in the vehicle dashboard.
- starting system we mean the system which is activated by the vehicle activation means, such as a key or a vehicle activation button. Activation corresponds to powering on the starting system. Conversely, deactivation corresponds to turning off the starting system, for example by removing the vehicle key from the dashboard.
- the starting system comprises at least one battery which is arranged to power the various systems of the vehicle, for example a traction or propulsion system, the air conditioning system, etc.
- starting system is arranged to activate or deactivate the vehicle, in particular the different systems which belong to said vehicle.
- powering up the starting system corresponds to powering the vehicle battery, for example by activating the vehicle key in the dashboard. Powering the battery thus causes a power supply to the control unit and therefore the power supply to the optical head.
- the present method 100 can be implemented on different types of vehicles, whether thermal, hybrid, electric or running on hydrogen.
- the starting system is deenergized, for example, by deactivating the key or activation button of the starting system.
- the method 200 includes an additional shutdown step 204 which automatically stops the power supply to the optical head. For example, turning off the power to the starter system cuts off power to the control unit, which automatically cuts power to the optical head.
- Process 200 begins a new iteration, denoted n2, of process 200 illustrated in Figure 4.
- the stopping of the optical head may have been caused by the completion of the stopping step 106.
- the stopping of the optical head may have been caused by stopping the vehicle or stopping the power supply to the vehicle.
- a “reset” or “a restart or start” of the starting system for example by power supply from the battery or when starting the starting system, makes it possible to begin a new iteration of the process 200 after cutting off the power supply to the optical head by the additional stopping step 204.
- FIGs 5, 6 each illustrate an embodiment of a control unit 10 according to the present disclosure.
- the optical head is illustrated in Figure 5 by the reference 20 but it should be noted that the optical head 20 is not part of the control unit 10.
- the control unit 10 of Figure 5 comprises a measurement module 11, an analysis module 12, an on/off module 13.
- control unit 10 is arranged to implement all the steps of the process 100 or 200.
- control unit 10 can be a calculation unit, a microcontroller, a controller, a computer or any other electronic device configured to carry out instructions.
- the measuring module 11 is arranged to measure at least one characteristic of the supply current 40 of the optical head 20.
- the measuring module 11 can be any sensor or measuring circuit which is arranged to measure an electric current.
- the analysis module 12 is arranged to analyze the at least one characteristic of the supply current 40 by comparing the at least one characteristic to a limit value.
- the analysis module 12 can be a processor of the control unit 10, for example a microprocessor.
- the on/off module 13 is arranged to stop a supply of the power supply current 40 to the optical head 20 when the at least one characteristic is greater than the limit value.
- the on/off module 13 is preferably a means of controlling the power supply of the optical head 20.
- the measurement 11, analysis 12 and on/off 13 modules are connected by wired connection means (not illustrated in this figure), for example by electrical connections.
- the control unit 10 is connected to the optical head 20 by an electrical connection 30.
- the electrical connection 30 is, for example, a conductive means, for example an electric wire, arranged to supply the supply current 40 to the optical head 20.
- the supply current 40 flows from the control unit 10 to the optical head 20.
- the optical head 20 is therefore powered by the control unit 10.
- the on/off module 13 can be a means which allows the closing or opening of the circuit formed by the control unit 10 and the optical head 20.
- the on/off module 13 can be a switch or a controlled switch.
- FIG. 6 illustrates another embodiment of the control unit 10.
- the control unit 10 illustrated in Figure 6 includes all the elements of the control unit 10 illustrated in Figure 5, so only the differences between these figures will be described.
- the supply current 40 is, for example, an analog signal.
- the on/off module 13 is an intelligent switch.
- intelligent switch we mean a switch which is active, that is to say it is configured and arranged to carry out actions other than those of closing or opening an electrical circuit.
- the on/off module is configured to send the supply current to the measurement module 1 1.
- the on/off module 13 includes a passive switch 1311.
- the switch 131 1 comprises two states, an opening state causing the opening of the electrical circuit formed by the control unit 10 and the optical head 20 and a closing state closing the electrical circuit formed by the control unit 10 and the optical head 20.
- the control unit 10 (and here precisely the analysis module 12) is arranged to send a stop 15 or open 15 command to the start module / stop 13 following the comparison step 104.
- the on/off module 13 opens or closes the switch 131 1.
- the The control unit 10 here, the analysis module 12
- the switch 131 1 retains its closed state if it is already closed or goes into the closed state if the switch 1311 was previously in its closed state. open state.
- the supply current 40 can flow from the control unit 10 to the optical head 20.
- the measurement module 1 1 illustrated in Figure 6 comprises a conversion module 1 11 1.
- the conversion module 1 1 1 1 is configured to convert the supply current 40 into an electrical voltage. Current properties power supply, in particular the characteristics of the supply current 40 are preserved during the current-voltage conversion. The output voltage of the conversion module thus includes characteristics similar to those of the supply current 40.
- the measuring module 1 1 illustrated in Figure 6 also includes a scanning module 11 13.
- the scanning module 1 1 13 is configured to digitize said electrical voltage, analog voltage, into a digital value 14 representing a voltage, digital value 14 which is then transmitted to the analysis module 12.
- the digital value 14 is for example coded on 12 bits.
- the digitization module 1113 is an analog-digital converter.
- the control unit 10 is powered by a supply current 50 coming from the battery of the vehicle starting system.
- the control unit 10 of Figure 6 optionally includes a protection module 16.
- the protection module 16 serves as an interface between the supply current 50 coming from the battery of the vehicle starting system and the unit control unit 10.
- the supply current 50 coming from the battery of the vehicle starting system is sent to the on/off module 13.
- the power supply to the control unit 10 is used to initiate the process 100 or 200 making it possible to control the operation of the optical head 20.
- the protection module 16 is connected to the on/off module 13 of the control unit 10.
- the on/off module 13 is arranged to initiate the supply of the supply current 40 to the optical head, for example by passing the switch 131 1 into its closed state.
- the engagement step 202 is therefore carried out.
- the supply of supply current 40 to the optical head 20 is initiated each time the starting system is powered up.
- the on/off module 13 is arranged to stop the supply of the supply current 40 each time said starting system is de-energized, i.e. when the control unit 10 is no longer powered by the battery of the starting system.
- the control unit 10 is no longer powered by the supply current 50.
- the switch can maintain its closed state or go into its open state since no supply current 40 circulates between the control unit 10 and the optical head 20.
- the system 700 illustrated in Figure 7 comprises the control unit 10 illustrated in Figures 5 or 6 and the optical head 20.
- the optical head 20 comprises at least one light source 21, in particular one in this example.
- the light source 21 is a pulse source.
- the emission duration can be adjustable or fixed.
- the pulse duration of the light source is preferably adjusted by the supply current 40, in particular by the duration of application of the supply current 40.
- the light source 21 is an infrared source, comprising , for example, an emission spectrum between 750 and 1000 nanometers.
- the emission spectrum of the light source is therefore in the infrared, which avoids disturbing the individual when driving because this wavelength range is not seen by the human eye. 'individual.
- the infrared source emits a wavelength of 850 nanometers. The safety and comfort of the individual are therefore further improved.
- the light source 21 is an LED or a Vertical Cavity Surface Emitting Laser (VCSEL).
- VCSEL Vertical Cavity Surface Emitting Laser
- the example of system 700 illustrated in Figure 7 optionally comprises a sensor 22.
- the sensor 22 is arranged to acquire at least one image of the individual when said individual is illuminated by said light source 21.
- the sensor can be a camera, for example a system for acquiring a three-dimensional image with a time-of-flight sensor, or a camera.
- the sensor 22 is preferably an infrared sensor.
- no power supply current 40 circulates between the control unit and the optical head 20.
- the switch 131 1 of the on/off module 13 is in its open state.
- the circuit formed by the control unit and the optical head 20 is open.
- Figure 8 illustrates an example of variation in the supply current 40 recorded by the measuring unit 11 and Figure 9 illustrates a variation in the light signal 24 emitted by the optical head 20.
- the first threshold 801 and the second threshold 802 are illustrated.
- the first threshold 801 is set at 6 milliseconds while the second threshold is set at 4.5 amps (A).
- the supply current 40 has a slot type variation with a high state and a low state 805.
- the low state is for example of 0.5 amps.
- the low state 805 is preferably greater than or equal to the minimum value which is in this example 0.5 amps.
- the low state 805 relates to an intensity greater than zero amperes and is equal to a minimum value depending on a residual current.
- the residual current is, for example, caused by an intrinsic electrical consumption of the optical head 20 excluding illumination.
- the low state 805 corresponds to a residual noise of the supply current 40.
- the variation of the supply current 40 comprises a first high state 803 and a second high state 804.
- the duration control by the first threshold 801 is initiated.
- the first threshold 801 is activated as soon as the supply current 40 presents an increase greater than 50% of the value of the low state 805, or 50% of the minimum value.
- a clock of the control unit 10 preferably of the analysis module 12 configured at the first threshold 801 can be activated.
- the high states 803, 804 and low 805 are predefined upstream, at the stage of design and/or mounting of the optical head 20 on the dashboard of the vehicle.
- these elements are configured so as not to be modified by unqualified people, for example by the owner of the vehicle or an external operator (the designer of the optical head) who would have to intervene on the vehicle in the event of an accident. or breakdown.
- the slot relating to the first high state 803 lasts less time and is less than the slot relating to the second high state 804.
- the first and second slots of the supply current 40 are lower than the second threshold 802. However, in the slot relating to the second high state 804, the supply current 40 is emitted for more than 6 milliseconds. The supply current 40 thus reaches first threshold 801. The supply current 40 is therefore cut off by the stopping step 106. The supply current goes to 0 amperes. The optical head 20 is no longer powered by the control unit 10. Thus following this example, the first threshold 801 is the first to have been reached and causes the power supply to the optical head 20 to stop even if the second threshold 802 has not been reached. [0094] The variation of the light signal 24 in Figure 9 emitted by the optical head 20 presents a variation similar to that of the power supply current 40 of the optical head 20.
- the light signal 24 emitted by the optical head 20 is cut.
- the light signal 24 emitted by the optical head 20 comprises a first pulse 901 equal to the duration of application of the supply current 40 of the first high state 803 of the supply current and a second pulse numbered 902 of duration equal to the first threshold 801.
- the light signal includes a low level 905 proportional to the low level 805 of the supply current 40.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Instrument Panels (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2203550A FR3134548B1 (fr) | 2022-04-15 | 2022-04-15 | procédé de commande d’une tête optique destinée à être utilisée dans un système d’observation d’un individu |
| PCT/EP2023/059164 WO2023198601A1 (fr) | 2022-04-15 | 2023-04-06 | Procede de commande d'une tete optique destinee a etre utilisee dans un systeme d'observation d'un individu |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4507928A1 true EP4507928A1 (fr) | 2025-02-19 |
Family
ID=83280149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23717527.8A Pending EP4507928A1 (fr) | 2022-04-15 | 2023-04-06 | Procede de commande d'une tete optique destinee a etre utilisee dans un systeme d'observation d'un individu |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4507928A1 (fr) |
| FR (1) | FR3134548B1 (fr) |
| WO (1) | WO2023198601A1 (fr) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6298311B1 (en) * | 1999-03-01 | 2001-10-02 | Delphi Technologies, Inc. | Infrared occupant position detection system and method for a motor vehicle |
| EP2469301A1 (fr) * | 2010-12-23 | 2012-06-27 | André Borowski | Procédés et dispositifs pour générer une représentation d'une scène 3D à très haute vitesse |
| CN110114246B (zh) * | 2016-12-07 | 2022-03-01 | 乔伊森安全系统收购有限责任公司 | 3d飞行时间有源反射感测系统和方法 |
| FR3090124B1 (fr) * | 2018-12-14 | 2022-07-15 | Valeo Comfort & Driving Assistance | Capteur de temps de vol et système de surveillance comportant un tel capteur |
-
2022
- 2022-04-15 FR FR2203550A patent/FR3134548B1/fr active Active
-
2023
- 2023-04-06 WO PCT/EP2023/059164 patent/WO2023198601A1/fr not_active Ceased
- 2023-04-06 EP EP23717527.8A patent/EP4507928A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR3134548A1 (fr) | 2023-10-20 |
| WO2023198601A1 (fr) | 2023-10-19 |
| FR3134548B1 (fr) | 2025-02-21 |
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