EP3326110A1 - Procédé et système d' affichage d' un panneau de direction de la scène routière pour véhicule automobile - Google Patents
Procédé et système d' affichage d' un panneau de direction de la scène routière pour véhicule automobileInfo
- Publication number
- EP3326110A1 EP3326110A1 EP16753952.7A EP16753952A EP3326110A1 EP 3326110 A1 EP3326110 A1 EP 3326110A1 EP 16753952 A EP16753952 A EP 16753952A EP 3326110 A1 EP3326110 A1 EP 3326110A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- panel
- displayed
- screen
- vehicle
- image
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/09623—Systems involving the acquisition of information from passive traffic signs by means mounted on the vehicle
-
- 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
- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
- G06V20/58—Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads
- G06V20/582—Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads of traffic signs
-
- 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
- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
- G06V20/588—Recognition of the road, e.g. of lane markings; Recognition of the vehicle driving pattern in relation to the road
Definitions
- the technical field of the invention is the processing and display of images acquired by an on-board camera, and more particularly the application of such a treatment to traffic assistance systems.
- document KR101478258 discloses a method of lane detection on a multi-lane road. However, the direction signs are not detected or displayed.
- the subject of the invention is a method of displaying a direction sign of the road scene for a motor vehicle equipped with a camera, a screen and a first calculation means able to realize a recognition of the panels. of speed, the camera being fixed on the motor vehicle so as to acquire images of the road scene in front of the vehicle, the screen being arranged so as to be visible to the driver during the use of the vehicle.
- the method comprises the following steps:
- the image of the direction sign to be displayed is scaled and the scaled image is processed, and
- the display on the display of the direction panel is displayed, as long as the direction sign remains on the acquired image.
- the sign to be displayed can be determined by performing the following steps:
- the detected direction panels are associated with a track according to the respective positions of the panels and tracks,
- the route is determined in the vehicle, and the panel is displayed as a panel to display the steering panel among the detected direction signs associated with the lane in which the vehicle is traveling.
- the panel to be displayed is the direction sign detected.
- Another object of the invention is a system for displaying a roadside direction sign for a motor vehicle. equipped with a camera, a screen and a first calculation means adapted to perform a recognition of the speed panels, the camera being fixed on the motor vehicle so as to acquire images of the road scene in front of the vehicle , the screen being arranged so as to be visible to the driver during the use of the vehicle.
- the system comprises the first calculation means capable of detecting the presence of signaling panels on the image received from the camera, a second calculation means able to determine if at least one direction sign is present among the detected signaling panels, and a fourth calculation means adapted to determine the readability of the characters of the direction panel to be displayed on the vehicle screen.
- the fourth calculation means is furthermore capable of scaling the image of the directional panel to be displayed as well as scaled image processing, and to maintain the display on the screen. the display of the direction panel to be displayed, as long as the steering panel remains present on the acquired image, the first calculation means being connected at the output to the second calculation means itself connected at the output to the fourth calculation means, the fourth calculation means being outputted to the screen.
- the second calculation means may be able to determine if a traffic sign is a direction sign comparing the shape of the traffic sign with a database of the shapes of the direction signs.
- the second calculation means may be able to determine if a traffic sign is a direction sign by determining the presence of a direction arrow by comparison with a database of direction arrows on steering panels.
- the system may comprise a third calculation means able to carry out an unintentional line crossing warning or a line maintenance assistance connected between the second calculation means and the fourth calculation means, the third calculation means being able to determine whether the road includes one or more lanes, and capable of determining the direction sign to be displayed in function of the respective positions of the panels, tracks and the vehicle.
- the fourth calculation means may be able to determine the size in number of pixels of the characters whose presence has been detected on a cropped image of the vehicle. panel to be displayed from the first calculation means, to determine whether the determined size of the characters is greater than or equal to a predetermined minimum character size value according to the Johnson Rosell criterion with a pixel number value corresponding to 50% of recognition of an empirically determined character and if so, to confirm the possibility of scaling without degradation of readability on the screen according to ergonomic rules,
- FIG. 1 illustrates the main steps of a method of displaying a direction sign of the road scene for a motor vehicle according to the invention
- FIG. 2 illustrates the main elements of a display system of a roadside direction sign for a motor vehicle according to a first embodiment of the invention
- FIG. 3 illustrates the main elements of a display system of a road sign of the road scene for a motor vehicle according to a second embodiment of the invention.
- the Johnson Rosell Criterion was originally defined for military thermal observation applications in which detection, identification and recognition thresholds were to be determined. This criterion is employed in the present invention to determine the driver's ability to detect, identify and recognize on a display screen the image of characters present on a direction sign.
- Johnson Rosell's criterion is to substitute for the object to be detected a target of the same size containing one or more pairs of lines in its height and width.
- the number of line pairs in the target is associated with a detection, recognition, and identification rate. These rates represent the probabilities of detection, recognition or identification of the object by the user.
- the implementation of the Johnson Rosell criterion in the invention makes it possible to determine whether an acquired image can be displayed or not, while knowing that it will be readable for the driver.
- the number of pairs of lines N corresponds to a number of pairs of lines of pixels on the screen displaying the final image while the object to be identified corresponds to the shape of a letter on the direction sign.
- the probability curve of Johnson's criterion is constructed according to the following formula:
- N the number of line pairs
- N50 the number of line pairs with a probability of identification.
- the N50 value must be determined empirically and is dependent on the screen and the camera, as well as the position of the camera relative to the user.
- This curve therefore makes it possible to determine the number N of lines or pixels on the screen necessary for the user to be able to identify a letter with a probability of success Probability (N) given and a number N50 of lines or pixels on the screen necessary for the user to be able to identify a letter with a 50% probability of success.
- the letter On the sensor of the camera, the letter must at least make the same number of pixels as on the screen (a pixel of the screen corresponds to a pixel of the camera) for such a conclusion to be valid. In the opposite case, a ratio of pixels between the camera and the screen must be introduced.
- a pixel of the camera corresponds to a pixel of the screen.
- the number of line pairs of the camera is equal to the number of pixel pairs.
- a probability table identifying a letter is then defined according to the number of pairs of lines acquired. Such a table can be determined empirically.
- a threshold of number of line pairs is determined which makes it possible to exceed a chosen identification probability threshold.
- a 95% probability of good identification corresponds to a number of pairs of pixels equal to at least 12, ie 24 pixels in height.
- the character when the size of the letter is greater than 24 pixels, the character is considered identifiable in the horizontal direction.
- a first step 1 it acquires, without digital zoom, an image of the scene observed with a camera attached to the motor vehicle so as to acquire images of the road scene in front of the vehicle.
- a second step 2 it is detected whether at least one traffic sign is present on the observed scene via a recognition of speed panels known from the state of the prior art. Indeed, this type of method is able to recognize the traffic signs, and among these panels, to recognize those of the speed panel type. Such a method can therefore be used to detect the presence of a traffic sign. If this is the case, the process continues with a third step.
- the third step 3 it is determined whether at least one direction sign is present among the detected traffic signs.
- the detected panels are classified according to their type by determining the shape of the panels detected by recognizing the speed panels and by comparing the determined shapes to a database of panel shapes. Alternatively, it is also determined by comparison with a database whether the panel comprises a direction arrow. If this is the case, the panel is a direction sign. If at least one detected panel is a direction panel, the method continues with a fourth step.
- a fourth optional step 4 it is determined whether the road comprises one or more lanes through an AFIL line crossing warning method (in English "Lane”). departure warning System ") or Lane Keeping Assist (known in French as” Lane Keeping Assist ”) known from the state of the art.
- AFIL line crossing warning method in English "Lane”
- Lane Keeping Assist known in French as” Lane Keeping Assist
- the directional sign to be displayed is determined by performing the following steps:
- the presence of tracks is determined according to the signaling lines present on the road,
- the panel to be displayed is the direction sign detected.
- a fifth step 5 the liability of the directional panel to be displayed on the screen is determined. To achieve this, the following steps are applied:
- the number of pixels of the characters whose presence has been detected on the cropped image of the panel to be displayed is determined by the method of recognizing the speed panels
- a possible sixth step 6 the image of the directional panel to be displayed is displayed at the scale determined in the fifth step.
- a possible seventh step 7 an image processing (saturation, contrast) of the direction panel to be displayed and scaled is performed.
- the method continues with the display on the screen of the direction panel to be displayed, the panel display being maintained as long as the panel remains present on the acquired image.
- the method displays at least one other type of road signs, for example an indication panel of fixed speed control radars.
- Figure 2 illustrates the main elements of a roadside sign display system for a motor vehicle.
- the display system comprises a calculator 10 comprising calculation means (10a, 10b, 10c, 10d), input connected to a camera 11 so as to acquire images of the road scene situated in front of the vehicle, the computer being connected at the output to a screen 12 disposed in the passenger compartment for displaying information to the driver during the use of the vehicle.
- the computer 10 comprises a first calculation means 10a able to analyze the image received from the camera 11 in order to detect the presence of traffic signs.
- a calculation means 10a may be a means for recognizing the speed limit signs. Indeed, such a means is able to determine the presence of road signs and then among these panels, those indicating a speed limit. It is thus possible to use the intermediate result of such a means to have road signs of the scene.
- the first calculation means 10a is outputted to a second calculation means 10b capable of detecting the presence of direction panels among the detected panels.
- the calculation means 10b is able to determine the shape of the panels detected by known means of the state of the art and to compare the determined forms to a database of forms of direction signs. As a variant, the calculation means 10b is also able to determine whether a signaling panel is a direction panel by determining the presence of a direction arrow by comparing it with a database of the direction arrows present on the steering arrows. direction signs.
- the second calculation means 10b is connected at the output to a fourth calculation means l Od able to evaluate the liability of the characters detected which will be described later.
- the system comprises a third computing means 10c connected at input to the second calculation means I Od and connected at the output to the fourth calculation means I Od able to evaluate the accessibility. detected characters.
- the third calculation means 10c is able to determine the position of said panels with respect to the different traffic lanes on the road and to detect the characters present on said panels.
- the third calculation means 10c may be an AFIL (Lane departure warning System) line crossing warning system or a line maintenance system (in the English language). "Lane Keeping Assi st”) known from the state of the art.
- the calculation means 10c is able to determine whether the road comprises one or more traffic lanes.
- the calculating means 10c is able to determine the directional sign to be displayed by determining the presence of lanes according to the signaling lines present on the road, by associating the detected directional signs with a lane according to the respective positions of the panels and the lanes, by determining the lane in which the vehicle is traveling, by choosing panel to display the direction sign among the panels detected direction associated with the lane in which the vehicle is traveling.
- the calculating means 10c is able to determine that the panel to be displayed is the direction panel detected.
- the calculation means l 0 is capable of determining the number of pixels of the characters whose presence has been detected on the cropped image of the panel to be displayed received from the first calculation means 10 a, determining whether the determined size of the characters is greater than or equal to a predetermined minimum character size value based on Johnson Rosell's criterion with a pixel number s corresponding to 50% recognition of an empirically determined character, and if this is the case, to confirm the possibility of scaling without impairing the accessibility on the screen according to ergonomic rules specific to the manufacturer.
- the present invention can be applied to any type of panel and ensures a comprehensible display by the driver of the image captured by the camera.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Traffic Control Systems (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1557056A FR3039309B1 (fr) | 2015-07-24 | 2015-07-24 | Procede et systeme d'affichage d'un panneau de direction de la scene routiere pour vehicule automobile |
| PCT/FR2016/051911 WO2017017359A1 (fr) | 2015-07-24 | 2016-07-22 | Procédé et système d' affichage d' un panneau de direction de la scène routière pour véhicule automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3326110A1 true EP3326110A1 (fr) | 2018-05-30 |
Family
ID=54199887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16753952.7A Withdrawn EP3326110A1 (fr) | 2015-07-24 | 2016-07-22 | Procédé et système d' affichage d' un panneau de direction de la scène routière pour véhicule automobile |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3326110A1 (fr) |
| FR (1) | FR3039309B1 (fr) |
| WO (1) | WO2017017359A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008010968A1 (de) * | 2008-02-25 | 2009-09-17 | Robert Bosch Gmbh | Anzeige eines relevanten Verkehrszeichens oder einer relevanten Verkehrseinrichtung |
| DE102008043155A1 (de) * | 2008-10-24 | 2010-04-29 | Robert Bosch Gmbh | Fahrerinformationseinrichtung |
| DE102008054041B3 (de) * | 2008-10-31 | 2010-06-10 | Audi Ag | Verfahren zur kombinierten Ausgabe eines Bildes und einer ein Verkehrszeichen betreffenden Information, sowie Kraftfahrzeug hierfür |
| JP5819420B2 (ja) * | 2010-06-15 | 2015-11-24 | コンティ テミック マイクロエレクトロニック ゲゼルシャフト ミットベシュレンクテル ハフツングConti Temic microelectronic GmbH | 自動車の交通標識認識システムと車線認識システムとを融合する方法 |
| DE102012025067A1 (de) * | 2012-12-19 | 2014-06-26 | Valeo Schalter Und Sensoren Gmbh | Fahrerassistenzeinrichtung mit kombinierter Verkehrszeichenerfassung und Markierungserfassung für ein Kraftfahrzeug und entsprechendes Verfahren |
-
2015
- 2015-07-24 FR FR1557056A patent/FR3039309B1/fr not_active Expired - Fee Related
-
2016
- 2016-07-22 EP EP16753952.7A patent/EP3326110A1/fr not_active Withdrawn
- 2016-07-22 WO PCT/FR2016/051911 patent/WO2017017359A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017017359A1 (fr) | 2017-02-02 |
| FR3039309A1 (fr) | 2017-01-27 |
| FR3039309B1 (fr) | 2017-07-14 |
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