Method and system for assisting the regulation of a mechanical timepiece

Abstract

The invention relates to a method for assisting the adjustment of a mechanism of a mechanical watch (10) used by a computer terminal. The method comprises the following steps: i) capturing an image or a sequence of images of the mechanical watch (10) by means of a computer device (20) comprising an image capture device (22) and a display area (24); ii) determining the adjustment to be made from the image or the sequence of images, and iii) displaying a sequence of instructions for the adjustment of the mechanism on the display area (24) of the computer device (20).

Description

TECHNICAL FIELD

[0001] The present invention relates to a method for assisting the setting of different mechanisms of a mechanical watch and a system for implementing this method. BACKGROUND

[0002] Many mechanical watches, in particular watches with high complexity, require the user to set various mechanisms, which can be tedious or complex. This setting can include setting a universal time mechanism or a triple question alarm, for example, setting an alarm or other operations depending on the type and complexity of the watch. The setting of the mechanisms involves a series of operations to be performed on the watch, for example by means of a crown, a button or other setting means, and varies not only depending on the mechanism to be set but also depending on the model of the watch.

[0003] For the setting of certain mechanisms, the series of operations must be performed according to a predefined sequence in order to obtain the desired setting and avoid any risk of damaging the mechanisms. For this purpose, these watches are sold with a user manual which includes precise instructions for setting the various mechanisms. However, using the manual to set the watch can be both tedious and complex.

[0004] There also exists a system for automatically setting the time displayed by an analog electronic watch by means of a smartphone.

[0005] EP2458458 relates to a method for precision measurement of a watch comprising a visual display, according to which:

[0006] - a first time instant is stored, in which the display is in a first display position corresponding to a first image, a first display value is determined for this first image, and this first display value related to the first time instant is stored in a memory;

[0007] - after a determined time interval, a second time instant is stored, in which the display is in a second display position corresponding to a second image, a second display value is determined for this second image, and this second display value related to the second time instant is stored in a memory;

[0008] - the time deviation of the display is calculated and displayed on a display device.

[0009] This method is intended to verify the running performance of the watch and to measure the precision of the watch. However, it does not help the user to correct these performances or to set the mechanisms.

[0010] WO2018 / 007978 relates to a method of measuring and displaying data relating to physical activity of a person, the method comprising:

[0011] - measuring data related to the physical activity of a person by means of a mechanical sensor in a watch;

[0012] - displaying the measured data on the dial of the watch;

[0013] - taking an image of said dial by means of a camera in a computer device;

[0014] - analyzing said image to determine said data;

[0015] - processing said data to process the analyzed data;

[0016] - displaying the processed data on the screen of the computer device.

[0017] This method allows to transfer the data displayed on the dial of a mechanical watch to a computer device, but does not allow the user to determine how to set the watch mechanism.

[0018] For example, WO2018210029 discloses a system for automatically correcting the time of an electronic watch with an analog display via a smartphone. The system comprises a computer application which, when executed, opens the camera of the smartphone to take a picture of the dial of the movement, analyzes the captured image to obtain the displayed time of the dial, compares the displayed time with the time at which the image was captured to obtain a time difference, and transmits this time difference to the electronic watch via a wireless communication module, in order to adjust the position of the hands according to the time at which the image was taken.

[0019] This type of automatic correction only allows to set the time of a watch, and only for electronic watches capable of communicating with a smartphone.

[0020] It is therefore an object of the present invention to provide a method for assisting the setting of an arbitrary mechanism of a mechanical timepiece.

[0021] It is another object of the present invention to provide a method for easily assisting the setting of a mechanical timepiece.

[0022] It is another object of the present invention to provide a computer data medium comprising a computer program for implementing the method according to the invention. SUMMARY

[0023] These objects are achieved by a method for assisting the setting of a mechanism of a mechanical timepiece implemented by a computer terminal, comprising the steps of:

[0024] capturing an image or a sequence of images of the mechanical timepiece by means of a computer device comprising an image acquisition device and a display area;

[0025] determining the setting to be made from said image or sequence of images, and

[0026] displaying on a display area of a computing device a sequence of instructions for setting said mechanism.

[0027] The method has the advantage that personalized instructions are displayed depending on the initial state and the desired final state of the mechanism in order to recommend for example the exact number of crown rotations and / or presses on the corrector button to achieve the desired setting.

[0028] The method can comprise a step of identifying the model of the watch.

[0029] This identification of the model of the watch can be performed by image recognition from said image or images of the sequence of images.

[0030] The sequence of instructions can depend on the model thus identified.

[0031] According to an embodiment, the identification of the model of the watch captured is performed by an image recognition system configured to determine which watch model saved in a database corresponds to the image of the watch captured, wherein the database is stored in the memory of the computing device or in the memory of a remote server accessible by the device.

[0032] This identification of the model of the watch can also be performed on the basis of an indication input by the user via a selection in a user interface, for example a menu.

[0033] The sequence of instructions can comprise for example pre-recorded text or video and is presented by said computer device.

[0034] The sequence of instructions can comprise text or video dynamically generated from said image or sequence of images. In this case, the sequence of instructions is personalized and depends on the indication displayed by the watch.

[0035] The sequence of instructions can comprise a series of operations to be performed by setting members such as one or more crowns, one or more stem shafts and one or more corrector buttons. For example, the sequence of instructions can comprise a series of operations to be performed by the setting members in order to bring the watch from a first state represented by an indicator of the watch to another desired state.

[0036] The identification of the model of the watch can be done by a selection from a menu with several models available for selection.

[0037] The identification of the model of the watch can be used to determine which mechanisms of the watch can be set.

[0038] The identification of the model of the watch can be used to determine which sequence of instructions should be displayed.

[0039] The watch model identification can be used to display the watch model in a corresponding sequence of instructions in a display area of the computing device.

[0040] Several different watch models can be associated with the same sequence of instructions for performing a given setting, for example when the models only differ from each other in aesthetic features or are part of the same series.

[0041] The method can comprise a step of determining from the plurality of mechanisms of the watch which mechanism is to be set.

[0042] According to an embodiment, the initial position of the indicator related to the mechanism to be set is automatically detected by the computing device. This detection can involve image recognition.

[0043] According to an embodiment, the initial position of the indicator related to the mechanism to be set is manually indicated by the user via the user interface.

[0044] According to an embodiment, the final position of the indicator related to the mechanism to be set is automatically detected by the computing device. This detection can involve determining a reference time, for example the current time when the indicator is intended to indicate an element of the current time.

[0045] According to an embodiment, the reference time is given by a clock of the computing device or by a remote server.

[0046] According to an embodiment, the sequence of instructions is displayed as explanatory text next to the identified watch model.

[0047] According to an embodiment, the sequence of instructions comprises a sequence of images indicating the movements to be performed on one or more setting members selected from the group of setting members comprising one or more crowns, one or more winding stems and one or more correction buttons.

[0048] The sequence of instructions can be displayed in augmented reality on an image of the watch captured with an image acquisition device.

[0049] According to an embodiment, the type of mechanism to be set is selected from the group of mechanisms comprising hour display, simple calendar or perpetual calendar, time zone selection mechanism, moon phase display mechanism, night sky configuration, and mechanisms for enabling / disabling an alarm, setting the alarm time and / or astronomical mechanism.

[0050] For example, the sequence of instructions can comprise a sequence of corrections of the time and date of a simple calendar, annual calendar or perpetual calendar.

[0051] According to an embodiment, the sequence of instructions comprises a series of operations to be performed by setting members such as one or more crown, one or more stem and one or more correction buttons, in order to bring the time and date displayed by the watch from the initial position represented by said image to a position corresponding to the time and date determined by said computer device or selected by the user using said computer device.

[0052] According to an embodiment, the computing device is a smartphone or a digital tablet or a computer.

[0053] Another aspect of the application relates to a computing device, in particular a smartphone or a digital tablet, comprising a processor and a memory storing a computer program comprising instructions which, when the program is executed by the processor of the computing device, cause the device to implement the method as described above.

[0054] Another aspect of the application relates to a computer program downloadable to a computing device, in particular a smartphone or a digital tablet, comprising instructions which, when the program is executed by the computing device, cause the computing device to implement the method as described above. BRIEF DESCRIPTION OF DRAWINGS

[0055] Examples of embodiments of the application are shown in the description illustrated in the attached drawings in which

[0056] - Figures la to lc A top view of the case of a watch with a calendar is shown;

[0057] - Figure 2 A schematic view of the capture of an image of a watch by a computing device, in particular a smartphone, is shown;

[0058] - Figure 3 A schematic view of a computing device according to an embodiment of the application is illustrated, on the screen side, with the captured image and the sequence of instructions displayed on this screen; Figure 2

[0059] - Figure 4 A computing device according to an embodiment of the application is shown in communication with a remote server; Figure 3

[0060] - Figure 5 A schematic view of a computing device according to another embodiment of the application is illustrated, on the screen side, with the captured image and the sequence of instructions displayed on this screen; Figure 2

[0061] - Figure 6 A schematic view of a user interface according to another embodiment of the application is illustrated; and​​​

[0062] -As an example, Figure 7 The diagram illustrates the steps of a process implemented by a computer device to display a sequence of instructions for setting a clock. Detailed Implementation

[0063] In this application, the mechanism to be set can consist of any watch complication function that displays any function other than the indication of hours, minutes, and seconds. It can be applied to manual or automatic winding watches. For example, the mechanism to be set according to the invention can be intended to display world time, the time of a given city, the day of the week, the month of the year, a second time zone, a power reserve indicator, and a moon phase. The mechanism to be set can also have, for example, a function to start / stop an alarm, a function to set an alarm time or a minute repeater, or astronomical functions such as a sky map of a given location, a week number, or a perpetual calendar.

[0064] Furthermore, in the context of this application, an indicator is any component of the mechanism whose position can be corrected to correspond to a reference time or duration. For example, an indicator can be in the form of a pointer for displaying hours, minutes, seconds, a second time zone, date, day of the week, or month of the year. An indicator can also be in the form of a disc for displaying, for example, the date, day of the week, month of the year, or moon phase through an aperture. An indicator can also be a display directly on the dial, as when a sky map is shown at a given location.

[0065] In such Figures la to lc In the embodiment illustrated, the method for assisting in setting the mechanism is implemented for a perpetual calendar that includes a perpetual calendar and a moon phase display mechanism.

[0066] To set up the mechanism, refer to the instruction manual typically provided with watches, which includes, for example, references to... Figures la to lc The following instructions.

[0067] To correct date 4, press the correction button B located between 11 and 12 o'clock in the watch case multiple times as needed until the desired date is displayed. To simultaneously correct the month display 5 and leap year display 6, press the correction button C located between 12 and 1 o'clock multiple times as needed until the desired month and year numbers are displayed (4 = leap year, 1 = first year after the leap year, 2 = second year after the leap year, 3 = third year after the leap year). To correct the moon phase, each press of the correction button D located at 6 o'clock advances the moon disc 8 by one day to the new phase. First, advance the moon disc until the moon appears in its simplest form at the center of the aperture. To position the moon on its accurate phase, press the correction button the number of times corresponding to the number of days that have elapsed since the last full moon.

[0068] In view of the numerous indications provided for the setting, the setting of certain mechanisms is tedious because it requires having the manual at hand or having to be connected to the Internet, for example for correcting the indication of the phases of the moon, which can be carried out with the help of a calculator indicating the angular position of the moon phase disc after having entered the day, the month and the year in the fields of a user interface dedicated to this purpose.

[0069] In order to be able to easily and in a simpler, easier, more precise and risk-free manner carry out the setting of any type of mechanism, for example the above-mentioned mechanisms, and the setting of the mechanical watch 10 for any model, the method for assisting the setting according to the first aspect of the application makes it possible to set the mechanism by means of a computer terminal, preferably a smartphone 20, in particular as illustrated in Figure 2 and Figure 3 The smartphone 20 or digital tablet is provided with an image acquisition device 22, a screen comprising a display area 24, and comprises in a conventional manner a memory which can store a computer application dedicated to assisting the setting of various mechanisms of the mechanical watch 10, and a processor which, when executing the computer application, allows the implementation of the method for assisting the setting of the mechanical watch 10.

[0070] This assistance method makes it possible to display or present a sequence of instructions, i.e. a sequence of operations of the setting members of the watch 10, which is displayed on the screen of the computer device 20 and which indicates which setting members are to be operated and how to operate them in order to obtain the desired setting.

[0071] The steps of the method for determining the sequence of instructions for setting the watch 10 are illustrated by way of example in Figure 7 These steps can be implemented by the computer device 20 and / or by a system comprising such a device and a remote server.

[0072] In step 100, the user who wishes to set his watch, for example in order to correct the position of the indicator, launches on his computer device a computer application, for example a correction application available from the manufacturer of the watch.

[0073] In step 102, the application displays on the display area 24 of the computer device 20 an invitation to take or photograph the mechanical watch 10 to be set using the image acquisition device 22 of the device, in order to capture an image or preferably a sequence of images of the watch 10.

[0074] In step 104, the application determines whether the image captured using the image capture device 22 corresponds to an image of the watch 10, for example an image of the front face of the watch 10. The application further determines whether the quality of the image sequence is acceptable, or for example whether the view is too far, too close, blurred, not bright enough, not contrasted enough, not stable enough, and / or whether the angle between the view axis and the front face of the watch is too far from the perpendicular. The user is preferably asked to correct the capture, for example by moving the image capture device 22, during step 106 until the view is acceptable and a sufficient number of images can be captured without these defects. The user can also be asked to capture several views of the watch 10 from several directions, for example a perpendicular view of the front face, a view taken from an oblique direction and / or a view of the side or back of the watch. These several views from several directions facilitate for example the construction of a 3D model of the watch and the identification of the model of the watch, for example if the model or an indication corresponding to the model is on the bottom of the watch.

[0075] In step 108, the images or image sequences of acceptable quality are saved and then pre-processed. This pre-processing can also be performed at least partially before the acceptable shot detection. The pre-processing can comprise for example brightness correction, contrast correction, white balance correction, cropping, etc.

[0076] In step 110, a 2D model or preferably a 3D model of the watch 10 is generated from the sequence of captured images.

[0077] In step 112, features of the watch and / or indicators of the watch are extracted from the model or directly from one or more images. These features correspond for example to key points on the watch such as the center of the dial, the end of an indicator, or to other parts of the image.

[0078] In step 114, the model of the watch 10 is then identified, for example based on the previously determined model and / or the extracted features.

[0079] The identification of the model of the watch can implement an image recognition process to determine the model of the watch photographed or taken. For example, the image recognition process can compare the image of the watch or the sequence of images of the watch or one of the features extracted from the image with corresponding data from a series of models of watches saved in a database, wherein the database is stored in the memory of the computer device 20.

[0080] The model of the watch can also be determined by comparing the model or the features of the model with corresponding data in a database 25, stored in the memory of the computer terminal via the wireless communication module (not shown) of the computer terminal 20. Figure 4) the memory of a remote server 30 accessible via the Internet. In this case, the server 30 executes a classification program, for example based on a neural network, to classify the received data and determine, based on reference data saved in a database 25 stored in the memory of the server 30, to which watch model it corresponds. The server thus identifies the corresponding model and transmits data relating to the identified model to the computer terminal 20.

[0081] In another embodiment, the watch model is selected by the user, for example from a list, or determined by default based on the user profile or based on a file indicating the watch model held by the user, or implicitly when the application has been launched.

[0082] In step 116, the computer application performs a check to see if it has a module available for generating a sequence of instructions for the identified watch model. If such a module is available, it proceeds to step 124 described below. When the corresponding computer module is not available in the computer terminal, the application checks if the module is downloadable (step 118). If no module is available, for example because the electronic user manual of the identified watch model does not exist, the application stops at step 120. Otherwise, the missing module is downloaded in step 122, either automatically and transparently to the user or after confirmation. The download of this module can be charged.

[0083] In step 124, the application then selects, via the user interface, the type of mechanism to be set among the several mechanisms of the identified watch model. This determination can be implicit, for example if the identified model comprises a single complication function that allows setting, or a single mechanism that needs to be set at a given time.

[0084] The setting to be made can for example be to correct the position of an indicator, for example to make this indicator display a reference time, for example the current time or the current time in another time zone.

[0085] The correction can also seek to change the position of an indicator in order to display a time chosen by the user, for example the time in another time zone, an alarm time, a selection of time zone, etc.

[0086] In step 126, the application determines the initial state of the selected mechanism, for example by determining the initial position of one or more indicators of the mechanism. For example, when the mechanism to be corrected corresponds to a current time display mechanism, this step can comprise determining the time displayed by the watch. This determination can be made by analyzing the captured images, the model or the features extracted from these images.

[0087] For example, according to Figures la to lcThe positions of the hour hand 12a and minute hand 12b, the moon phase disc 8 and the hands 15, 16, 17, 18 indicating the date, the day of the week, the month of the year and the 24-hour indicator can be determined automatically from the features extracted from the model determined in step 110, respectively by image analysis.

[0088] The automatically determined initial positions of the one or more indicators can be manually corrected, for example when the recognition system detects an inaccurate or erroneous indication, for example due to parallax errors.

[0089] It should be noted, however, that the application generally allows determining the initial positions of the indicators with a higher precision than the one offered by manual verification. Thus, the position of the moon indicator is generally difficult to determine to the exact date, so that the user is not aware of the exact correction to be made. By contrast, the image captured by the computer device can be zoomed in and angle or area measurements can be made to determine this initial position with a high precision, thereby avoiding the risk of proposing an inappropriate correction.

[0090] Alternatively or optionally, the user manually enters an indication of the initial position of one or more indicators to be set via the user interface. For example, according to Figure 6 The hour, the date, the day of the week and the month of the year can be manually entered by the user into the corresponding fields of the user interface 28.

[0091] In step 128, the application determines the final state towards which the mechanism should be corrected. For example, this final state can correspond to a reference time, in particular when the mechanism displays a time indication.

[0092] The reference time can correspond to the current time, for example at the location of the user or at another location. This current time can be given, for example, by an internal clock of the computer terminal 20 and can correspond to the time at which the image or sequence of images is captured by the image capture device 22, or to the current time. According to an alternative embodiment, the reference time data can be transmitted to the computer terminal 20 by a remote server, for example the server 30, while transmitting data relating to the model of the recognized watch 10 to the computer terminal 20 as shown in Figure 4

[0093] The computer application can then determine in step 130 a sequence of instructions 26 for setting the selected mechanism. The sequence 26 is determined according to the model of the recognized watch, for example so that the position of at least one indicator of the function corresponds to the previously determined final state. For example, the sequence 26 represents the number of presses to be made on one or more buttons, the number of rotations of the crown, etc., and the order of these operations.

[0094] ​The sequence of instructions can be generated dynamically according to the initial state and the final state of the watch. The sequence of instructions can also be pre-recorded and independent of the initial state and / or the final state.

[0095] The sequence of instructions 26 is displayed on the display area 24 of the computing device 20 in step 132.

[0096] In an advantageous embodiment, the computer application is configured to automatically position the initial position of the indicator of the selected mechanism, and to display the sequence of instructions for this mechanism according to the difference between the time given by the position of the indicator of the selected function and the reference time.

[0097] The display of the sequence of instructions for setting the selected mechanism of the watch 10 so that the position of the indicator of the function corresponds to the reference time can take various forms. For example, the sequence of instructions can be displayed in the form of explanatory text, for example displayed next to the model of the identified watch 10, as illustrated in Figure 3 In another embodiment, the sequence of instructions can comprise a sequence of graphs. In yet another embodiment, the sequence of instructions can comprise a sequence of animated videos, for example automatically generated based on the selected watch model, the selected mechanism, the initial position of the indicator to be corrected and / or the final position of this indicator. For example, the sequence of animated videos can display the movements to be performed on the different control components of the watch (for example, a press on a button, a rotation of a crown, an axial displacement of a winding stem, etc.), and the effect of these movements on the watch indicator. In another mode or additionally, these setting instructions can be audio instructions, with or without an image.

[0098] Advantageously, the instructions are displayed on the image of the watch in an augmented reality manner. The positioning of the instructions is preferably adapted to take into account the position and orientation of the watch in the image; for example, the instructions can comprise highlighting on the image of the watch of the member to be operated, for example a crown or a button, or of the member to be observed, for example an indicator.

[0099] The sequence of instructions can be represented as an animation, for example the sequence of text, pictograms and / or images can be represented as an animation. The animation can be displayed in superimposition on the image of the watch. The animation can be automatically scrolled, or by means of a graphical interface element for controlling the scrolling.

[0100] The scrolling of the animation can also be synchronized with the captured image, so that the operation performed on the watch according to one instruction generates the display of the next instruction.

[0101] Alternatively, as illustrated in Figure 5 the sequence of instructions 26 is displayed in the form of explanatory text next to the model of the identified watch 10, in combination with an indication 27 arranged with respect to the displayed model to indicate the setting member to which the explanatory text refers.

[0102] The display ends in step 132.

[0103] The method can comprise a step 136 of automatically verifying the correction made. To this end, the computer application can ask the user to take a picture or a photograph of the corrected watch and then to verify the position of the corrected indicator to ensure that the position of the indicator corresponds to the final chosen position or to the current time at which the verification is made.

[0104] In an embodiment, the watch is specifically designed in order to facilitate the determination of the initial position and / or of the final position of the indicator to be corrected. To this end, the indicator and / or the dial can comprise markings specifically made in order to facilitate the detection of this indicator and / or of the dial and the determination of their relative position. These markings can be made in a wavelength that is hardly visible to the user.

[0105] The method ends at step 138.

[0106] Some of the steps described above are optional and at least the steps not listed in claim 1 are optional. Moreover, the order of these steps can be changed.

[0107] According to another aspect of the application, the computer application is also configured to identify from the sequence of images taken by the image acquisition means 22 of the computing device 20 a unique code specific to the watch, for example a serial number. This identification can be used to determine a sequence of personalized instructions, for example based on the year of manufacture, the place of purchase for determining the reference time zone or according to the model of the watch, the user or other preferences of the place or date of purchase to determine a sequence of personalized instructions.

Claims

1. A method implemented by a computing device (20) for assisting a user in manually setting a mechanism of a mechanical watch (10), said mechanism having at least one function, said method comprising the steps of: - capturing an image or a sequence of images of the mechanical watch (10) by means of the computing device (20) comprising an image acquisition device (22) and a display area (24); - determining from the image or the sequence of images the settings to be made to the mechanism having the function, and - displaying on the display area (24) of the computing device (20) a sequence of instructions for the settings of the mechanism to be performed by the user on the mechanical watch.

2. The method according to claim 1, comprising a step of identifying the model of the mechanical watch (10), the sequence of instructions depending on the model.

3. The method of claim 2, wherein, The identification of the model of the watch (10) is performed by image recognition from the image or the sequence of images.

4. The method according to claim 1, comprising a step of determining which mechanism among a plurality of mechanisms of the watch (10) that can be set by the user is to be set.

5. The method according to claim 4, determining the settings to be made so that the position of the indicator of the mechanism to be set corresponds to a reference time indicated by the user or determined automatically.

6. The method of claim 5, wherein, The reference time is given by a clock of the computing device (20) or by a remote server (30).

7. The method of claim 2, wherein, The model of the watch (10) identified is displayed in the display area (24) of the computing device (20) together with the sequence of instructions for setting the mechanism.

8. The method according to claim 1, the sequence of instructions comprising text or video pre-recorded and played back by the computing device.

9. The method according to claim 1, the sequence of instructions comprising text or video dynamically generated from the image or the sequence of images.

10. The method of claim 1, the sequence of instructions comprising a series of operations, the series of operations being performed by a setting member, wherein, The setting members comprise one or more crown(s), one or more winding stem(s) and one or more corrector button(s).

11. The method of claim 7, wherein, The sequence of instructions is displayed as explanatory text displayed in augmented reality with the model of the watch (10) identified.

12. The method of claim 1, wherein, The sequence of instructions comprises an animation of a modeled image of the model of the watch (10) in order to indicate the movements to be performed on one or more setting members selected from the group of setting members comprising one or more crown(s), one or more winding stem(s) and one or more corrector button(s).

13. The method of claim 1, wherein, The type of mechanism to be set is selected from the group comprising the display of hours, minutes, seconds, a simple calendar, an annual or perpetual calendar, a second time zone, a moon phase, a night sky configuration and the mechanisms for enabling / disabling an alarm, for setting the time of an alarm and astronomical functions.

14. The method of claim 13, wherein, The sequence of instructions comprises a correction sequence of the time and date of a simple calendar, an annual or perpetual calendar.

15. The method of claim 14, wherein, The sequence of instructions comprises a series of operations performed by setting means comprising one or more crown(s), one or more stem shaft(s) and one or more correction button(s) to bring the time and date displayed by the watch from the position represented by the image to the position corresponding to the time and date determined by the computing device (20) or selected by the user using the computing device (20).

16. The method of claim 1, wherein, The computing device (20) is a smartphone, a digital tablet or a computer.

17. A computing device (20) comprising a processor and a memory storing a computer program, the computer program comprising instructions which, when the program is executed by the processor of the computing device (20), cause the computing device (20) to implement the method according to claim 1.

18. The computing device (20) of claim 17, wherein, The computing device is a smartphone or a digital tablet.

19. A computer program product downloadable to a computing device (20), the computer program product comprising a computer application comprising instructions which, when the computer application is executed by the computing device, cause the computing device to implement the method according to claim 1.

20. The computer program product downloadable to a computing device (20) according to claim 19, wherein, The computer application is a computer application downloadable to a smartphone or a digital tablet.

Images