FR3014211A1 - METHOD FOR LOCATING AN OPTICAL ELEMENT IN A BEAM OF OPTICAL ELEMENTS OF AN OPTICAL CABLE - Google Patents

Abstract

There is provided a method for locating an optical element in a bundle of optical elements of an optical cable, each optical element of the bundle being associated with an identifier of its own, each optical element being marked with a marking which is clean, the method comprising the following steps, for locating an optical element associated with a predetermined identifier in the beam: - acquisition by a camera of an image of the beam of optical elements, - detection in the acquired image of a zone of interest showing an optical element marked with a marking corresponding to the predetermined identifier, - generation of a virtual object highlighting the localized area of interest, - generation and display on a screen of an image of augmented reality superimposing the acquired image and the virtual object.

Description

The invention relates to the field of optical cables. The invention relates more particularly to a method for locating an optical element in an optical cable and a device adapted to implement such a method.

STATE OF THE ART An optical cable generally consists of a set of optical fibers, these optical fibers are either sheathed unitarily, or grouped into different modules, or uncoated (optical fiber bare). By module is meant a group of optical fibers surrounded by an envelope. The optical modules generally have a diameter of the order of one millimeter, the unit-sheathed optical fibers have a diameter between 600 and 900 μm and the bare optical fibers have a diameter of 250 μm or even 200 μm.

An optical cable generally comprises a plurality of optical fibers, each optical fiber carrying a light signal independent of other optical fibers. Each of the optical fibers can have a particular assignment, for example, they can be assigned individually to different subscribers of a FTTH network (Fiber To The Home). Technicians are required to perform interventions on such cables after their installation in the network. An example of an intervention is the connection of a new subscriber 30 to an optical network by means of an optical cable already installed near the housing of this new subscriber. To make this connection, a technician opens a window in the optical cable, identifies a module included in the optical cable, and derives it. In addition, a constant goal of optical network operators is to increase the total throughput of optical cables.

Also, the development of small-sized and high-capacity optical fiber cables leads us to manufacture cables based on increasingly smaller diameter modules or even without intermediate modularity, ie without isolating a specific number of fibers. optical modules, but simply by depositing the bare fibers in the cable cavity. However, the human eye is failing to identify one object among a multitude of others especially if they are of reduced size, for example less than one millimeter in diameter and particularly for diameters of 250 pm which is the diameter. bare optical fiber.

This difficulty is accentuated when the identification must be done in a window of a few square centimeters. Therefore, the technician in charge of the derivation of an optical fiber for example may have great difficulty in locating and selecting this optical fiber in a cable comprising a large number of other fibers.

PRESENTATION OF THE INVENTION An object of the invention is thus to facilitate the localization by a technician of an optical element in a bundle of optical elements of an optical cable comprising a large number of optical elements having a reduced diameter. for example of the order of 250 pm. For this purpose, it is proposed according to a first aspect of the invention a method of locating an optical element in a bundle of optical elements of an optical cable, each optical element of the bundle being associated with an identifier which is each optical element being marked with its own marking, the method comprising the following steps for locating an optical element associated with a predetermined identifier in the beam: acquisition by a camera of an image of the beam of optical elements, - detection in the acquired image of a zone of interest showing a marked optical element with a marking corresponding to the predetermined identifier, - generation of a virtual object for highlighting the localized area of interest , - generation and display on a screen of an augmented reality image superimposing the acquired image and the virtual object. Even if the augmented reality image displays a large number of portions of optical elements of the cable, a technician contemplating this image can easily distinguish the optical element associated with the identifier he is looking for, because this optical element is evidence in a portion of this image, by means of the virtual object. The proposed method therefore makes it possible to overcome the failures of the human eye, which can, without assistance, lead to the selection of an erroneous optical element, or even fail to achieve it.

The duration of the intervention performed by the technician is then considerably shortened and its execution made more comfortable for it, which is exempted from examining one by one and very closely the multitude of optical elements of the optical cable considered. The method described further allows, by using bare optical fiber cables, in the case of a connection of a subscriber to an optical network, a better mutualization of the optical fibers of the cable, by allowing to take only the number of fiber needed per connection point. In general, this method can be implemented for cables based on bare optical fibers without organizing them into different modules. The use of such optical cables, whose manufacturing costs are lower than those of conventional optical cables based modules or optical fibers sheathed unitarily, can be considered. The method according to the first aspect of the invention may also be supplemented by the following features, taken alone or in any of their technically possible combinations. The method may comprise a preliminary step of selecting, in a marking database, visual data representative of the marking corresponding to the predetermined identifier. Since the marking database is stored in a remote server, and the camera and the screen are moreover included in a display device comprising means of communication with the remote server, the selection step can also be preceded. the device transmitting a request comprising the predetermined identifier to the remote server, and being followed by receiving a response message from the remote server, the response message comprising the selected visual data response to the query. The marking may comprise a coloration of each optical element, the visual data selected in the marking database include color information representative of the color of at least one optical element of the beam, and the detected area of interest to show. the colored optical element according to a color represented by the color information. The marking may further comprise at least one pattern printed on the outer surface of each optical element, the visual data selected in the marking database include pattern information, and the detected area of interest show a portion of the surface area. of the optical element comprising a pattern represented by the pattern information. The detection step may comprise the steps of: primary recognizing a plurality of candidate areas in the acquired image, each candidate area showing a respective optical element marked with a mark represented by one of the pattern and color information , and secondary recognition of the area of interest by selecting a candidate area showing a labeled optical element with a marking represented by the other pattern and color information. The steps of the method may be repeated for a succession of images of the beam of optical elements, for example two successive images. The method may also include a sound warning step by a loudspeaker of the device, when the area of interest is present in one of the two successive images and absent from the other of the two successive images.

The method may also include an enlargement step by which at least the area of interest displayed in the augmented reality image is larger than the actual dimensions of the optical element that the area of interest shows.

According to a second aspect, the invention proposes a display device for locating an optical element in a bundle of optical elements of an optical cable, each optical element of the bundle being associated with an identifier of its own, each optical element being marked with a marking of its own, the device comprising a camera, a display screen and data processing means, the data processing means being programmed to control: the acquisition by the camera of an image of the beam of optical elements, and the display on the screen of an augmented reality image superimposing the acquired image and a virtual object of highlighting a localized area of interest, the area of interest showing a optical element marked with a marking corresponding to a predetermined identifier. The processing means may also be programmed to: detect, in the image of the optical element beam acquired by the camera, the area of interest corresponding to the predetermined identifier, generate the virtual object of highlighting of the the localized area of interest, generating the augmented reality image superimposing the acquired image and the virtual object. The device according to the second aspect of the invention may further comprise means for accessing a marking database associating a plurality of optical element identifiers with a plurality of corresponding visual information, the access means being configured to initiate the selection, in the marking database, of the visual data associated with the predetermined identifier. The access means may be means of communication with a remote server in which the marking database is stored. According to a third aspect, the invention also proposes a server comprising means for storing a tagging database, inter alia associating a plurality of identifiers of optical elements with a plurality of corresponding visual information, means for data processing and communication means with the device according to the second aspect of the invention, wherein: the data processing means is configured to control the selection, in the marking database, of visual data representative of a marking corresponding to a predetermined identifier contained in a request received by the communication means, the communication means being further configured to transmit to the device a response containing the visual data found by the data processing means. DESCRIPTION OF THE FIGURES Other characteristics, objects and advantages of the invention will emerge from the description which follows, which is purely illustrative and non-limiting, and which should be read with reference to the accompanying drawings, in which: FIG. an optical cable. Figure 2 shows a marking table according to one embodiment, for marking optical elements of an optical cable. Figures 3 and 4 schematically show a system according to one embodiment, comprising a display device of the invention and a server. Figure 5a schematically shows the display device illustrated in Figures 3 and 4, in operation. Figures 5b and 5c show schematically the portion of the optical cable of Figure 1, after cutting a window in this portion. Fig. 6 is a flowchart of steps of a locating method according to one embodiment of the invention. FIG. 7 represents different images obtained during the implementation of the method of FIG. 5. In the set of figures, the similar elements bear identical references. DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, an optical cable C comprises an outer sheath G which encloses at least one bundle of optical elements F1, F2 F3 extending lengthwise in the sheath (that is, that is, the optical elements are not twisted together).

An optical fiber is defined as a fiber comprising a core, generally doped silicon, an optical sheath surrounding the core, generally made of silicon, and a surrounding protective envelope. The protective envelope can be formed of epoxy acrylate and can protect the fiber against mechanical stresses. An optical fiber typically has an outer diameter of 250 microns. In the remainder of the description, the term "optical element" means a bare optical fiber. Each optical element F1, F2, F3 is marked with a marking 15 of its own in the optical cable C. For example, the marking comprises the coloration of a given optical element in a color of its own. This color is preferably applied over the entire surface of the optical element so as to allow identification of the optical element from any localized portion of that optical element. The marking may further include applying a pattern that is specific to each optical element. This pattern comprises for example one or more rings or portions of rings extending around each optical element. In one embodiment of bare optical fiber cables, each ring portion extends about 180 degrees about the longitudinal axis of the corresponding optical fiber; we then speak of "half-ring". Marking can be done by inkjet on a generator 30 of each optical element. A half-ring is more or less visible by transparency around the periphery of the optical element.

Two types of half-rings can be used to form a pattern: a half-ring of narrow length, representing a value "1", consisting of an alignment of 6 dots of black ink, and has a length of about 1.8 mm; a half-ring of wide length, representing a value "5", consisting of an alignment of 12 points of black ink, and has a length of about 3.6mm. Each black dot constituting the half-ring has a diameter of about 0.2mm. Each optical element F1, F2, F3 can then be identified by a pattern associated with a value that depends on a combination formed by one or more narrow and / or wide half-rings spaced from blank ranges of a length of about 1.8. mm, like a bar code. The pattern may be reproduced along the entire length of the corresponding optical element, at longitudinal positions spaced apart from each other by blank ranges of more than 20mm in length. The marking may also be a combination of several sub-markings, such as a pair consisting of a pattern and a color, this pair being specific to each optical element of the cable beam considered. It is possible in this case that several optical elements have the same color, and that several of the optical elements have the same pattern, as long as each optical element has a pair consisting of a pattern and a color of its own. A marking table combining a color and a pattern according to one embodiment is illustrated in FIG. 2. In this embodiment, twelve different colors are used for coloring optical elements: red, blue, green, yellow, purple , white, orange, gray, brown, colorless, turquoise, and pink. Twelve different patterns are also used, each pattern being made based on rings or portions 30142 1 1 of variable number rings and respective lengths variables. 144 optical elements can thus be represented by such marking. Each pattern is printed in a predetermined color and different from the colors used for coloring, for example black. Combining several sub-markings is advantageous when each sub-marking is limited to a limited range of values. Staining of the optical elements and a number of rings impressed on their surface allows a greater number of optical elements to be marked with a limited number of colors and a limited amount of rings. With reference to FIGS. 3 and 4, a display device 1 comprises a camera 10, data processing means 11, means of access to a marking database B, and a display screen 12. Each of these means may be associated or dissociated from one or more of the other means. The data processing means 11 are adapted to receive images acquired by the camera 10 and are also adapted to transmit to the display screen 12 of the images to be displayed. The data processing means 11 are also connected to the access means to the database B. The data processing means 11 are particularly suitable for implementing image processing algorithms. These algorithms, for example, can be used in the development of tools for recognizing predetermined shapes in an image, and / or color (s). The camera 10 and the display screen 12 are arranged on opposite sides of the display device 1. Thus, a user contemplating on the display screen 12 images acquired or derived from images acquired by the camera 10, can easily adjust the positioning of the viewing device 1 with respect to the object observed by the camera 10.

The viewing device 1 may also comprise a data storage module 13 comprising a random access memory unit (RAM) and / or a read-only memory unit such as one or more hard disks, SSD disk (s), memory (s) ) flash, etc.

The display device 1 may also comprise input means 16 such as a physical keyboard, or a touch screen of the display screen 12. The display device 1 may also comprise sound warning means 17, such as than a speaker.

The display device 1 may for example be a smartphone-type phone, a tablet, a laptop, electronic glasses. The device 1 may also comprise a support 3 enabling it to be positioned in a spatially stabilized manner, in particular so as to fix its camera 10 facing a bundle of optical elements to be examined. The viewing device 1 may also comprise a light source 15 adapted to emit light of neutral color and oriented so as to illuminate an object observed by the camera 10. In the embodiment illustrated in FIG. 3, the access means to the marking database B are communication means 14 with a remote server 2. The communication means 14 may for example be of the wireless (3G, Wifi, etc.) or wired (Ethernet) type. The remote server 2 also comprises communication means 24 with the viewing device 1 and a storage module 22 in which the marking database B is stored. As a variant, the marking database B is stored locally in the storage module 13 of the display device 1 and the access means are reading means for this storage module 13.

Regardless of its storage location, the database B comprises a plurality of optical element identifiers and a plurality of corresponding visual data. In other words, a given optical element identifier is associated with a visual data set representative of the marking of an optical element. If the marking of each optical element includes coloring, the visual data associated with an identifier includes color information that represents the coloring applied to the optical element. For example, the color information may be a color code, for example of the type having red, green and blue (RGB) components. If the marking of each optical element comprises the application of a pattern, the visual data associated with an identifier includes pattern information that represents the pattern applied to the optical element. For example, the pattern information may be a numerical value represented by the combination of narrow half-rings and / or wide half-rings which constitutes this pattern. The access means are configured to select, in the marking database B, visual data associated with a predetermined identifier. A method of locating an optical element of the beam in the optical cable C will now be described with reference to FIGS. 5a to 8. In the following, we will take the example of a cable C comprising the F1 optical elements , F2, F3 of the cable of FIG. 1, the optical element F1 having a marking to a ring M1 and a color C1, the optical element F2 having a marking with two rings M2 and a color C2, and the optical element F3 having a three-ring marking M3 and a color C3. It is also assumed that the optical element to be located is F2, of identifier 1D2.

In a preliminary step, a portion of the beam of the optical cable C is placed facing the camera 10 of the viewing device 1, as shown in Figure 5a. This step may for example include cutting a window in the outer sheath of the optical cable C 80 mm in length, the manual extraction of a portion of the beam by a technician out of the sheath to form an "omega" d a height of 25 mm, as illustrated in Figure 5b, and the presentation by the same technician portions of optical elements constituting the portion of the beam extracted facing the camera 10 of the viewing device 1. The technician can for example enter the viewing device 1 with one hand, and expand by means of his other hand the optical elements of the beam, for example along his fingers as shown in Figure 5c. The technician can also place the display device 1 on its support 3 before bringing the partially extracted beam of the field of view of the camera 10 with both hands, allowing it to better develop the various optical elements, for example between his fingers . As illustrated in FIG. 6, in a step 101, the technician 20 grasps, via the input means 16, the predetermined identifier 1D2 corresponding to the optical element F2 to be processed in the beam of the optical cable C. This identifier 1D2 can for example, consist of a character string representative of a new subscriber to an optical network that includes the optical cable C on which the technician intervenes. In a step 103, the display device 1 accesses the marking database B; are then searched and selected in the database B marking the visual data representative of a marking corresponding to the identifier entered 1D2. In the embodiment in which the marking database B is stored on the remote server 2, the search is preceded by a step 102 in which the viewing device 1 sends a request message to the server 2, the message request containing ID2 entered by the technician; the search is further followed by the return 104 by the server 2 of the visual data selected in the marking database B to the display device 1.

The selected visual data corresponding to the identifier entered ID2 may for example be stored in the storage module 13 of the display device 1 until the entry of another identifier and the subsequent selection of corresponding visual data.

In a step 105, the camera 10 acquires an image IA of the beam partially extracted from the optical cable C and illuminated by the light source 15. By "image of the beam" is meant an image showing at least a portion of an optical element of the beam . By way of example is represented in FIG. 7, an acquired image IA showing the optical elements F1, F2, F3 of the cable of FIG. 1, the optical element F1 having a marking with a ring M1 and a color C1, the optical element F2 having a two-ring marking M2 and a color C2, and the optical element F3 having a three-ring marking M3 and a color C3.

In a detection step 106, the data processing means 11 of the visualization device 1 detect, by means of an appropriate image processing algorithm, a zone of interest Z in the acquired image IA, the zone d Z-interest showing the marking represented by the visual data in the marking database B. This zone of interest Z may for example be a zone delimiting the contour of the portion of the optical element F2 displayed in the acquired image IA (this zone is in dashed lines in FIG. 7). The detection 106 of the zone of interest Z may for example comprise the following two substeps, each sub-step processing a respective marking information contained in the visual data.

In a first substep of color recognition, the data processing means 11 determine one or more candidate areas having color pixels corresponding to the color information selected by the database B.

This color recognition may for example comprise a calculation of the delta E between the selected color information and the color of each pixel of the acquired image IA. If a delta E is less than a predetermined threshold, then the corresponding pixel is considered to be part of a candidate area.

For example, if the colors C1 and C2 are identical, then the candidate areas will be the zone Z, associated with the element F2, and an area associated with the optical element F1 (not shown). The apparent colors of the optical elements seen by the camera 10 may vary depending on the external illumination conditions of the beam being examined. Also, the light source 15 of the viewing device 1 advantageously greatly reduces the variability of these apparent colors seen by the camera 10, and thus improve the reliability of the color recognition implemented. In a second substep of pattern recognition, the data processing means 11 proceed to the election, among the candidate zones obtained, of an area of interest which displays a number of rings equal to the number of rings. which constitute the pattern information of the visual data (here zone Z). This treatment in two sub-steps makes it possible in particular to accelerate the detection of the zone of interest Z. Of course, the two sub-steps can be inverted (detection of candidate zones on the basis of a pattern and then election on the base of a color). In an enlargement step 107, the acquired image IA in its entirety, or only the determined zone of interest Z, can be enlarged by the data processing means 11, enabling the technician to effectively distinguish the area of interest. This step 107 can also be performed before the detection of the zone of interest Z over the entire acquired image IA by the camera 10. In a step 108, a virtual object 0 is generated from the zone of interest Z detected, the virtual object 0 being intended to highlight the area of interest Z of the acquired image IA. For example, the virtual object 0 may comprise two curves highlighting the contour of the zone of interest Z determined. When the zone of interest Z is the portion of the optical element to be treated which is shown in the acquired image IA, the virtual object 0 then marks the contour of this portion. The virtual object 0 may comprise other highlighting markers, for example arrows or information relating to the optical element itself (such as its identifier displayed in the form of a character string). In a step 109, a so-called "augmented reality" image is generated from the acquired image IA and the virtual object 0 and displayed on the display screen 12. The augmented reality image IR obtained superimposes the virtual object 0 to the content of the acquired image IA. The virtual object 0 can thus for example be included in a mask 10 of the same dimensions as the acquired image IA, each pixel of this mask corresponding to a respective pixel of the acquired image IA. The augmented reality image is then displayed on the screen 12 in a display step 110. In the IR augmented reality image thus obtained, the technician 25 can then detect where the optical element F2 associated with the identifier that he grasped and take it by means of an instrument such as a clamp, as shown in Figure 5a. He can then proceed to the intervention he is responsible for, for example the derivation of the localized optical element F2 to connect a subscriber to an optical network 30 in which is included the optical cable C.

The steps described above can be repeated for a succession of images acquired by the camera 10 of the viewing device 1, producing a plurality of augmented reality images successively displayed on the display screen 12. With each image of augmented reality IR can match an acquired IA image. As a variant, the augmented reality images are not generated for all the images acquired by the camera 10 but only for a part of it, for example an augmented reality image for N images acquired consecutively.

The described method may also comprise a sound warning step implemented by a loudspeaker embedded in the display device 1. This sound warning step is triggered when the zone of interest (Z) is present in one of the two successive images and absent from the other of the two successive images.

Thus, the technician can be warned that the optical element F2 comes out or enters the field of view of the camera 10, following a relative displacement between the beam of optical elements F1, F2, F3 and the camera 10. This allows technicians to adjust the positioning of the beam relative to the camera 10 or to better develop the various optical elements between his fingers if it turns out that the optical element to be treated is masked by other optical elements of the beam. The embodiment that has been presented above proposes to relocate the search step 103 on the remote server 2, the other illustrated steps being implemented by the display device 1, which makes it possible in particular to avoid the storage of data. a very large base B on a plurality of devices 1, and to pool this storage on a server accessible by this plurality of devices 1. In a second embodiment, only the acquisition steps 101, acquisition 105 and display 110 are implemented by the display device 1 and the other steps described are implemented by the remote server 2. In this second embodiment, an acquired image IA is sent to the server 2 after the acquisition step, and an augmented reality image elaborated by the server 2 is sent back to the display device 1 before being displayed on its screen. 12. In a third embodiment, all the steps of the method described above are implemented locally by the display device 1. In this case, the database B is stored in the read-only memory unit of the storage module 13. The invention is not limited to the embodiments proposed above but may be the subject of many other variants.

Other types of optical element marking than those presented previously can be envisaged. For example, other patterns than rings may be applied to the optical elements of the beam considered. In the method embodiments presented above, an identifier is entered by a technician, and only the optical element F2 having a marking corresponding to that identifier entered is highlighted in the augmented reality image IR. As a variant, no identifier is previously entered by the technician, and each marking shown in the acquired image IA is the subject of a detection, and 20 is accompanied by a corresponding virtual object 0 in the acquired image IA. , each virtual object 0 displaying, for example, the character string of the corresponding identifier. The proposed method can be implemented in full optical cable or at the end of this optical cable.

The locating method may be used to locate elements of other types of cables than optical cables such as twisted pair cables.

Claims (14)

REVENDICATIONS1. A method of locating an optical element (F2) in a bundle of optical elements (F1, F2, F3) of an optical cable (C), each optical element (F1, F2, F3) of the beam being associated with a identifier of its own, each optical element being marked with a marking (M1 and Cl, M2 and C2, M3 and C3) of its own, the method comprising the following steps, for locating an optical element (F2) associated with a predetermined identifier in the beam: acquisition (105) by a camera (10) of an image (IA) of the beam of optical elements, detection (106) in the acquired image (IA) of an area of interest ( Z) showing an optical element (F2) marked with a marking (M2, C2) corresponding to the predetermined identifier, generating (108) a virtual object (0) for highlighting the zone of interest (Z) localized, generation (109) and display (110) on a screen (12) of an augmented reality (IR) image superimposing the acquired image (IA ) and the virtual object (0). 2. Method according to claim 1, comprising a preliminary step of selecting (103), in a marking database (B), visual data representative of the marking (M2 and C2) corresponding to the predetermined identifier. 3. Method according to claim 2, wherein, the marking database (B) being stored in a remote server (2), the camera and the screen (10) being moreover included in a device (1) of display comprising communication means (14) with the remote server (2), the selection step (103) is preceded by the transmission (102) by the device (1) of a request comprising the predetermined identifier to the remote server (2), and is followed by receiving (104) a response message from the remote server (2), the response message including the selected visual data in response to the request. 4. Method according to one of claims 2 and 3, wherein the marking comprises a coloration (C1, C2, C3) of each optical element (F1, F2, F3), the visual data selected in the database (B ) comprise color information representative of the color (C2) of at least one optical element (F2) of the beam, and the detected area of interest (Z) shows the colored optical element (F2) according to a color (C2) represented by the color information. 5. Method according to one of claims 2 and 3, wherein the marking comprises at least one pattern (M1, M2, M3) printed on the outer surface of each optical element (F1, F2, F3), the selected visual data. in the marking database (B) comprise pattern information, and the detected area of interest (Z) shows a surface portion of the optical element (F2) comprising a pattern (M2) represented by the information pattern. The method of claims 4 and 5 taken in combination, wherein the detecting step comprises the steps of: - primary recognition of a plurality of candidate areas in the acquired image (IA), each candidate area showing an element respective optics marked with a marking represented by one of the pattern and color information, and - secondary recognition of the area of interest (Z) by election of a candidate area showing a labeled optical element with a marking represented by the other pattern and color information. 7. Method according to one of claims 1 to 6, wherein the steps are repeated for two successive images acquired by the camera (10), and further comprising a sound warning step by a loudspeaker (17) of the device (1), when the zone of interest (Z) is present in one of the two successive images and absent from the other of the two successive images. 8. Method according to one of claims 1 to 7, comprising an enlargement step (107) by which at least the zone of interest (Z) displayed in the augmented reality image (IR) is of larger dimensions that the actual dimensions of the optical element (F2) that the area of interest (Z) shows. 9. Method according to one of claims 1 to 8, wherein the steps are repeated for a succession of images of the beam of optical elements. 10. Display device (1) for locating an optical element (F2) in a bundle of optical elements (F1, F2, F3) of an optical cable (C), each optical element (F1, F2, F3) of the beam being associated with an identifier of its own, each optical element being marked with a marking (M1 and C1, M2 and C2, M3 and C3) which is specific to it, the device (1) comprising a camera (10), a display screen (12) and data processing means (11), the data processing means (11) being programmed to control: the acquisition by the camera (10) of an image (IA) of the beam of optical elements, and the display on the screen (12) of an augmented reality image (IR) superimposing the acquired image (IA) and a virtual object (0) for highlighting an image area. localized interest (Z), the zone of interest (Z) showing an optical element marked with a marking corresponding to a predetermined identifier. Apparatus (1) according to claim 10, wherein the processing means (11) is further programmed to: detect, in the image (IA) of the optical element beam acquired by the camera (10), the zone of interest (Z) corresponding to the predetermined identifier, generating the virtual object (0) for highlighting the localized area of interest 10 (Z), generating the augmented reality image (IR) superimposed the acquired image (IA) and the virtual object (0). The device (1) of claim 11, further comprising access means (14) to a tagging database (B) associating a plurality of optical element identifiers with a plurality of visual information. corresponding, the access means (14) being configured to initiate the selection in the marking database (B) of the visual data associated with the predetermined identifier. 20 13. Device (1) according to claim 12, wherein the access means are communication means (14) with a server (2) remote in which is stored the database (B) marking. 25 A server (2) comprising storage means (22) for a marking database (B) associating a plurality of optical element identifiers with a plurality of corresponding visual information, data processing means (21) and communication means (24) with a device (1) according to claim 13, wherein: - the data processing means (21) is configured to control the selection in the database (B ) marking, visual data representative of a marking corresponding to a predetermined identifier contained in a request received by the communication means (24), the communication means are further configured to transmit to the device (1) a response containing the visual data found by the data processing means (21).