Zooming technique by iterative displaying of new images

Abstract

A technique for enlarging an area of interest (Z1) in an image (I1) by obtaining and displaying a new image (I2) comprising said area of interest (Z1) at a size and sharpness level adjusted according to a user's instruction. A method, a computer program, a device and an apparatus therefor.

Description

DESCRIPTION Title: Zoom technique by iterative display of new images Technical field

[0001] The invention relates to the field of displaying images, in particular digital images, on a display medium such as a screen or a projection surface.

[0002] The invention relates more specifically to a zoom technique, the notion of zoom being defined as an enlargement of an area of ​​interest of a displayed image.

[0003] The invention relates to a method for representing a scene on a display medium, a computer program, as well as a device and an apparatus implementing such a method. State of the prior art

[0004] Many devices, for example smartphones, can display an image and enlarge an area of ​​interest in the displayed image based on instructions from a user wishing, for example, to observe objects present in the area of ​​interest in greater detail. The sharpness of this area and the objects it contains typically depends on the focal length used when capturing the image.

[0005] There is a need to improve techniques for displaying images and enlarging images so displayed.

[0006] The invention aims in particular to provide an image display technique making it possible to improve the visualization of areas of interest by a user. Statement of the invention

[0007] To this end, the invention relates to a method for representing a scene on a display medium, comprising: - a step of displaying, on the display medium, an image of said scene, - at least one iteration of an enlargement phase comprising the following steps: ■ detection of an enlargement instruction for an area of ​​interest in the displayed image, ■ obtaining a new image comprising said area of ​​interest with a size and level of sharpness adjusted according to the enlargement instruction, ■ display, on the display medium, of the new image.

[0008] The invention thus makes it possible to display on the display medium an image whose area of ​​interest has a size and a level of sharpness which are specifically adapted to the demand of a user expressed in the form of a magnification instruction. Thus, under the action of a modification of the magnification instruction, the method of the invention makes it possible to display a succession of images whose level of sharpness is adapted to the size of the area of ​​interest.

[0009] The invention therefore makes it possible to display an image with a quality adapted to the need, in other words, to personalize the display of the scene so that the area of ​​interest observed and enlarged by the user is always clear.

[0010] In one embodiment, the step of obtaining a new image comprises selecting an image from a stack of images.

[0011] In one embodiment, the image stack comprises images having one or more areas of interest including images wherein, for at least one of said areas of interest, that area of ​​interest has a respective size and / or sharpness level.

[0012] For example, considering a first image and a second image in the stack, the first image may define an area of ​​interest having a first size and a first sharpness level, while the second image may define said area of ​​sharpness according to a second size and a second sharpness level. Without limitation, the second size may be larger than the first size and the second sharpness level may be larger than the first sharpness level.

[0013] For another example, considering three images in the stack, each defining a first area of ​​interest and a second area of ​​interest, the first area of ​​interest may have, on the one hand, a first size and a first level of sharpness in the first image and in the second image, and, on the other hand, have in the third image a second size and a second level of sharpness respectively larger than the first size and the first level of sharpness. In this example, the second area of ​​interest may have, on the one hand, a first size and a first level of sharpness in the first image and in the third image, and, on the other hand, have in the second image a second size and a second level of sharpness respectively larger than the first size and the first level of sharpness.

[0014] In the non-limiting examples just described, a change in the size of the area of ​​interest from one image to another is associated with a corresponding change in the level of sharpness. Thus, more generally, the stack may include images in which at least one area of ​​interest has both a different size from one image to another and a different level of sharpness from one image to another.

[0015] Of course, the stack may also include, alternatively or additionally, images in which at least one area of ​​interest has either a different size from one image to another or a different level of sharpness from one image to another.

[0016] In one embodiment, the selection of an image in the stack is carried out according to information on the position and size of the area of ​​interest associated with each of the images in the stack.

[0017] Said information on position and size of the area of ​​interest corresponds to information making it possible to know, for each of the images in the stack, a level of sharpness associated with at least one area of ​​interest of the image as well as a size of this area of ​​interest.

[0018] For example, considering a series of images in the stack all comprising the same area of ​​interest in the scene, this information associated with each of the images in this series can typically be representative of a level of sharpness and a corresponding size of this area of ​​interest.

[0019] In one embodiment, the image stack comprises at least one image captured by an imaging device.

[0020] Without limitation, the imaging apparatus may comprise one or more cameras.

[0021] In one embodiment, the image stack comprises images captured by an imaging device using a "focus bracketing" technique, providing several images of the scene according to a respective depth of field so as to define a respective level of sharpness for at least one given area of ​​interest.

[0022] In one embodiment, the image stack comprises at least one image obtained by calculation or simulation, from at least one other image.

[0023] For example, from a first image in which an area of ​​interest has a given level of sharpness, a second image can be obtained by deconvolution, preferably incomplete, from a transfer function corresponding to an optic used to capture the first image.

[0024] When the step of obtaining a new image includes selecting an image from a stack, as described above, the new image exists prior to the step of detecting the enlargement instruction, which improves the speed of the method.

[0025] Alternatively or additionally, the step of obtaining a new image may comprise, for one or more iterations of the enlargement phase, a generation of the new image on the fly, after detection of the enlargement instruction. Thus, the new image may not exist before implementation of the enlargement phase and be generated according to the enlargement instruction.

[0026] In one embodiment, during at least one iteration of the enlargement phase, the area of ​​interest of the new image comprises one or more objects absent from the displayed image.

[0027] In one embodiment, the method comprises, before the step of displaying the new image, a step of enhancing the contrast of the new image as a function of the enlargement instruction.

[0028] Enhancement, which improves the sharpness of the area of ​​interest, can be differentiated by taking into account the level of magnification required.

[0029] In one embodiment, the step of detecting the enlargement instruction comprises detecting an action of a user, such as rotating a mouse wheel, moving one or more fingers on a touch screen, prolonged viewing of said area of ​​interest, or even a position of a part of the user's body and / or of a device worn by the user.

[0030] In one embodiment, the method comprises multiple iterations of the enlargement phase.

[0031] The method according to the invention may comprise a step of obtaining a stack of images as defined above.

[0032] The step of obtaining a stack of images can be performed before the first iteration of the enlargement phase.

[0033] According to another aspect, the invention relates to a computer program comprising executable instructions which, when executed by a computer device, implement all the steps of a method as defined above.

[0034] The computer program can be in any computer language, for example, machine language, C, C++, JAVA, Python, etc.

[0035] According to another aspect, the invention also relates to a device comprising means configured to implement all the steps of a method as defined above.

[0036] The device according to the invention can be, or be integrated into, any type of device such as a smartphone, a tablet, a computer, a calculator, a processor or even a computer chip, programmed to implement the method according to the invention, for example by executing the computer program according to the invention.

[0037] According to yet another aspect, the invention relates to an apparatus comprising a display medium, a means for detecting an enlargement instruction, and a means for obtaining an image, configured to implement all the steps of a method as defined above.

[0038] In a non-limiting manner, the display medium may comprise a display screen, such as a screen of a smartphone, a tablet, a computer or even a television, and / or comprise a surface onto which the image is projected.

[0039] In other alternative examples, the display medium may be a medium worn by the user, for example, one or more display glasses.

[0040] In one embodiment, the apparatus is a virtual reality or augmented reality headset comprising a display screen or a projector associated with a projection surface onto which the displayed image is projected. The headset may comprise a sensor, for example an optical sensor, forming said detection means.

[0041] In one embodiment, the detection means is formed by the display medium.

[0042] For example, in a non-limiting manner, when the display medium comprises a display screen or a projection surface, this display screen or this projection surface can form a touch-sensitive surface capable of detecting a magnification instruction. The magnification instruction can typically result from detecting a movement of a user's fingers on the touch-sensitive surface.

[0043] When the invention implements a step of obtaining a stack of images, said means of obtaining an image can be configured to acquire the images of the stack.

[0044] In one embodiment, the apparatus comprises a camera or a camera module forming said means for obtaining an image.

[0045] Alternatively, the step of obtaining the stack of images may be carried out by another means not belonging to the apparatus of the invention as defined above. In this case, the means for obtaining an image may be configured to retrieve one or more images from the stack acquired elsewhere.

[0046] In one embodiment, the apparatus is a user device such as a smartphone, tablet, etc. forming said display medium. Said detection means may be, or may comprise, a touch surface, in particular a touch surface integrated into, or associated with, such a display medium.

[0047] In one embodiment, the apparatus is a computer-type user apparatus forming said display medium. Said detection means may be, or may comprise, a touch-sensitive surface, in particular a touch-sensitive surface integrated into, or associated with, such a display medium, or a pointer which may, for example, be moved by a mouse, or a directional pad of the computer.

[0048] In one embodiment, the apparatus is a television. Said detection means may be a camera integrated into the television, configured for example to detect the gaze and / or the position of the head of an observer, or a pointer which may for example be moved by a remote control of the television.

[0049] In one embodiment, the apparatus is a virtual reality or augmented reality headset forming said display medium, in the form of a screen or a projector associated with an image projection surface. Said detection means may be, or may comprise, a sensor, in particular an optical sensor, equipping such a headset.

[0050] For another non-limiting example, the device may be a medical imaging device, for example an endoscope or an ultrasound device.

[0051] According to another aspect, the invention relates to a vehicle comprising a display support, a means for detecting an enlargement instruction, and a calculation means, configured to implement all the steps of the method according to the invention.

[0052] The vehicle may not include a means of acquiring an image. In this case, the image(s) of the scene are provided by another device or another vehicle.

[0053] Alternatively, the vehicle may include an image acquisition means, such as a camera or a camera module. In this case, the image(s) of the scene may be acquired by this acquisition means, or be provided by another device or another vehicle.

[0054] In one embodiment, the vehicle is a land vehicle such as a car, whether autonomous or not.

[0055] In one embodiment, the vehicle is a flying vehicle such as a drone, an airplane or even a helicopter, autonomous or not.

[0056] In one embodiment, the vehicle is a marine vehicle such as a boat or a submarine, whether autonomous or not.

[0057] According to embodiments, at least one image of the scene is a two-dimensional image. In particular, said new image displayed by the method of the invention may be a two-dimensional image.

[0058] Optionally, the image stack may include at least one two-dimensional image. All images in the may be two-dimensional.

[0059] According to embodiments, at least one image of the scene is a three-dimensional image. In particular, said new image displayed by the method of the invention may be a three-dimensional image.

[0060] If applicable, the image stack may include at least one three-dimensional image. All images in the image stack may be three-dimensional.

[0061] Other advantages and characteristics of the invention will appear on reading the detailed, non-limiting description which follows. Brief description of the drawings

[0062] The following detailed description refers to the attached drawings in which: - [Fig. 1] is a schematic representation of a method according to the invention, comprising a phase of enlarging an area of ​​interest of an image including a step of obtaining a new image; - [Fig. 2] is a schematic representation of a step of obtaining a new image, with selection from a stack of images; - [Fig. 3] is a schematic representation of a method according to the invention, comprising a step of obtaining a new image with selection from a stack of images; - [Fig. 4] is a schematic representation of a device configured to implement steps of a method according to the invention; - [Fig. 5] is a schematic representation of a device according to the invention, of the smartphone or tablet type; - [Fig. 6] is a schematic representation of a device in accordance with the invention, of the virtual reality or augmented reality headset type; - [Fig. 7] is a schematic representation of a medical imaging device according to the invention; - [Fig. 8] is a schematic representation of a vehicle in accordance with the invention; - [Fig. 9] is a schematic representation of an initial image and a new image obtained in accordance with the invention; - [Fig. 10] is a schematic representation of an initial image and a new image obtained in accordance with the invention. Detailed description of embodiments

[0063] Figure 1 schematically illustrates an example of a method 100 according to the invention.

[0064] The method 100 makes it possible to create a personalized display of a scene on a display medium.

[0065] In this example, the display medium is a screen with a touch surface.

[0066] More generally, the display medium may comprise any display means, including a projection surface onto which one or more images are projected, for example using a projector.

[0067] The method 100 of FIG. 1 comprises a step 102 of displaying, on the display medium, an initial image 11 of the scene.

[0068] For explanation purposes, the scene includes, on the initial image 11 thus displayed, several objects including a first object 01 and a second object 02 (see figure 9).

[0069] The method 100 of FIG. 1 comprises an enlargement phase 104 which comprises a step 106 of detecting an enlargement instruction for an area of ​​interest of the displayed image.

[0070] When the enlargement phase 104 is first performed, the image displayed when this phase is initiated is the initial image 11.

[0071] With reference to Figure 9, it is considered in this example that the area of ​​interest ZI comprises said first object 01 and does not comprise said second object 02.

[0072] In this non-limiting example, the instruction is provided by a relative movement of a user's fingers on the touch-sensitive surface of the screen. For example, the detection on the touch-sensitive surface of a first of said fingers can be used to identify the location of the area of ​​interest on the displayed image, the initial position of this first finger indicating the center of the area of ​​interest. From this information on the position of the area of ​​interest on the displayed image, the detection of a movement on the touch-sensitive surface of a second of said fingers, in a direction of distance of this second finger from said first finger, can be considered as representative of a desire of the user to enlarge the area of ​​interest.

[0073] Of course, the enlargement instruction can be detected by any means of detecting a user action. For example, in a non-limiting manner, the detection means can comprise a mouse wheel, a sensor configured to detect a user viewing a portion of the display medium, or a user body movement sensor.

[0074] In one embodiment, the degree of magnification of the area of ​​interest from one image to the next is a predefined value.

[0075] For example, with reference to FIG. 9, upon detection of an instruction to enlarge the area of ​​interest ZI on the initial image 11 displayed on the screen, the size of the area of ​​interest ZI on the new image 12 displayed on the medium at the end of the first performance of the enlargement phase 104 may be a function of this predefined value and of the size of the area of ​​interest ZI on the initial image 11.

[0076] In alternative embodiments, user action parameters, such as the amplitude and / or speed of movement of said second finger, may be used to define a desired degree of magnification.

[0077] When the enlargement instruction for the area of ​​interest is detected in step 106, a step 108 of the enlargement phase 104 is implemented, consisting of obtaining a new image 12 which comprises said area of ​​interest with a size and a level of sharpness adjusted according to the enlargement instruction thus detected.

[0078] The size of the area of ​​interest corresponds to its relative dimension in a displayed image, for example to the dimension along two principal axes of an outline of the area of ​​interest which may have a rectangular geometry.

[0079] The sharpness level of the area of ​​interest can be defined as the amplitude of the spatial frequencies associated, for example, with objects present in the area of ​​interest. As a first approximation, the sharpness level of the area of ​​interest can also be defined as the density of pixels contained in or constituting the area of ​​interest.

[0080] Considering in this example a degree of enlargement of predefined value, the size of the area of ​​interest on the new image 12 corresponds to the product of a number greater than 1, for example equal to 1.5 or 2, and the size of the area of ​​interest on the previously displayed image, in this case the initial image 11 when the new image 12 is obtained during the first performance of the enlargement phase 104.

[0081] In this example, the level of sharpness is proportional to the degree of enlargement, so that the area of ​​interest of the image remains sharp despite the enlargement carried out. To do this, the area of ​​interest can be acquired at a different depth of field between said new image 12 and said initial image 11 and more generally between the different images used during multiple iterations of the enlargement phase 104.

[0082] For purely explanatory purposes, the scene may include, in said area of ​​interest ZI of the new image 12, a third object 03 absent from the initial image 11 (see figure 9). Indeed, the increase in the size and the level of sharpness of the area of ​​interest during a given enlargement phase 104 makes it possible to make appear or make visible objects which do not appear or are not visible with a lower size and level of sharpness.

[0083] More generally, as successive iterations of the enlargement phase progress, new objects may appear and / or objects may disappear, including for example so as to make appear in a subsequent image an object masked by an object appearing in a previous image. In a non-limiting manner, the invention may thus be implemented in the context of a walking application within a space such as a virtual supermarket, the zoom being able for example to make it possible to move from one aisle of the supermarket to another.

[0084] After obtaining the new image during step 108, the enlargement phase 104 of the method 100 implements a step 110 of displaying, on the display medium, said new image 12.

[0085] In the schematic example of Figure 9, the size of the area of ​​interest ZI on the new image 12 corresponds to the size of the new image 12.

[0086] In the alternative example of Figure 10, the size of the area of ​​interest ZI on the new image 12 is smaller than the size of the new image 12. In this case, the parts of the new image 12 not belonging to the area of ​​interest ZI may be parts of the previous image 11 enlarged in the same way as the area of ​​interest ZI or, as in the example of Figure 10, be parts of the previous image 11 preserving their initial size.

[0087] Of course, with reference to FIG. 1, several iterations 112 of the enlargement phase 104 can be implemented successively, in order to achieve a progressive enlargement dynamically.

[0088] In this example, the initial image 11 as well as the new images 12 obtained during different enlargement phases 104 are images captured by an imaging device, such as a camera.

[0089] These different images can be selected from a stack of images (figure 2), for example according to the non-limiting example described below with reference to figure 2, or be obtained on the fly (not shown).

[0090] Figure 2 schematically represents an example of a step 200 for obtaining a new image, which can be implemented within the framework of the invention. In particular, step 200 can constitute all or part of step 108 of the method 100 of Figure 1.

[0091] In the example of Figure 2, the new image 12 is selected from a PI stack of images.

[0092] The PI stack comprises in this example a series of images each representing said area of ​​interest with a respective size and level of sharpness. Thus, with reference to the preceding description, the images of this series represent in this example said first object 01 and certain images of this series also represent said third object 03, depending on the size and the corresponding level of sharpness of the area of ​​interest.

[0093] Each of the images in the PI stack used in the method 200 is associated with information known as the position and size of the area of ​​interest, indicating a level of sharpness and a corresponding size of the area of ​​interest considered here. The PI stack can of course include multiple sets of images associated with respective areas of interest and which are identified using this information.

[0094] In a non-limiting manner, the images of the PI stack can be acquired by a “bracket shooting” or “focus stacking” type technique, using a conventional imaging device. Thus, in a manner known per se, the imaging device can be controlled to obtain several images of the same part of the scene one after the other. Between each image thus acquired, the focus of the device can be modified so that each image is acquired with a different focus, and therefore with a different depth of field, at least for the part of the scene considered which may constitute said area of ​​interest.

[0095] Of course, the images of the PI stack, or some of them, can also be obtained by calculation, from one or more images of the scene.

[0096] Step 200 of Figure 2 comprises a step 202 of determining the area of ​​interest to be enlarged and the corresponding degree of enlargement which results from the enlargement instruction. This enlargement instruction can be previously determined during step 106 of the method 100 of Figure 1. As indicated above, the degree of enlargement can be a predefined value.

[0097] Step 200 of FIG. 2 comprises a step 204 of comparing information relating to the area of ​​interest and the associated degree of enlargement with said information on the position and size of the area of ​​interest associated with each image of the PI stack.

[0098] When this information corresponds to the information on the position and size of the area of ​​interest associated with an image of the PI stack, or when the difference between the corresponding values ​​is less than a predetermined threshold, this image of the PI stack is selected, during a step 206, to constitute said new image 12.

[0099] Figure 3 is a schematic representation of another non-limiting exemplary embodiment of a method 300 according to the invention.

[0100] The method 300 of Figure 3 comprises on the one hand all the steps of the method 100 of Figure 1 and, on the other hand, a step 302 of obtaining a stack PI of images, for example a stack such as that used in the method 200 of Figure 2.

[0101] Figure 4 shows a non-limiting example of a device 400 according to the invention.

[0102] The device 400 comprises a module 402 implementing one or more of the steps of the method of the invention.

[0103] The module 402 comprises a module 404 performing a display of an image of the scene given to it as input. This module 404 can typically be configured / programmed to perform the display steps 102 and 110 of the method 100 of FIG. 1.

[0104] The module 402 further comprises a module 406 for detecting an instruction to enlarge an area of ​​interest of the image displayed by the module 404. In this non-limiting example, the module 406 is configured to take as input a position of one or more fingers of a user on a touch surface and to determine the area of ​​interest on the displayed image. The module 406 can typically be configured / programmed to carry out step 106 of the method 100 of FIG. 1.

[0105] The module 402 further comprises a module 408 for obtaining a new image to be displayed, for example according to any of the techniques described above. The module 408 can typically be configured / programmed to carry out step 108 of the method 100 of FIG. 1 or step 200 of FIG. 2.

[0106] One or more of said modules of the device 400 may be independent of one or more other modules of this device 400 and / or be integrated within the same module.

[0107] One or more of said modules of the device 400 may be a hardware module and / or a software module such as a computer program.

[0108] In particular, at least one of the modules 404, 406 and 408, or the module 402, can be integrated into an electronic chip, or even into an application installed in a user device.

[0109] The device 400 further comprises a display means 410, such as a screen which in this example comprises a touch-sensitive detection surface 412 configured to detect the enlargement instruction.

[0110] In an alternative embodiment, the display means 410 is a means for projecting an image onto a support, configured to display an image of the scene. [YES] Such a display means 410 may be integrated into the device 400.

[0112] Alternatively, the device 400 may not include such a display means. For example, the device 400 may be integrated into an apparatus that already has a display means and be configured to cooperate with the latter in order to display the image of the scene.

[0113] According to yet another alternative, the device 400 can be connected to an external display means, or to an external device having a display means or itself connected to a display means.

[0114] Optionally, the device 400 may further comprise an image acquisition means 414, such as a camera, or a camera module, comprising an optical lens and an image sensor, for acquiring an image or a stack of images of the scene.

[0115] Such an image acquisition means 414 can be integrated into the device, for example on a front and / or rear face.

[0116] Alternatively, the device 400 may not comprise such an image acquisition means. For example, the device 400 may be integrated into an apparatus which already has an image acquisition means such as a camera module and be configured to cooperate with this image acquisition means.

[0117] According to yet another alternative, the device 400 can be connected to an external image acquisition means, or to an external device having an image acquisition means or itself connected to an image acquisition means.

[0118] The device 400 may further comprise a computing unit (not shown) for producing one or more images of the scene in the manner described above.

[0119] Figure 5 is a schematic representation of a non-limiting exemplary embodiment of a device 510 according to the invention.

[0120] The apparatus 510 of Figure 5 comprises means configured to implement the invention, and in particular any one of the methods 100 and 300 described above.

[0121] In this example, the device 510 is a smartphone, or a tablet, comprising a device according to the invention, in particular the device 400 of FIG. 4 and in particular the module 402, as well as a display screen 512 equipped with a detection surface 514, for example of the capacitive type.

[0122] Figure 6 is a schematic representation of another non-limiting exemplary embodiment of an apparatus 610 according to the invention.

[0123] The apparatus 610 of Figure 6 comprises means configured to implement the invention, and in particular any one of the methods 100 and 300 described above.

[0124] In this example, the device 510 is a virtual reality or augmented reality headset, comprising a device according to the invention, in particular the device 400 of FIG. 4 and in particular the module 402, as well as a display screen 612 and a sensor (not visible in FIG. 6) configured to detect the position aimed at by an eye, or the eyes, of the user on the display screen 612.

[0125] According to a first embodiment, the headset 610 does not include imaging means for capturing images of the scene. In this case, the image(s) of the scene to be displayed by the headset 610 are provided by another device.

[0126] According to a second embodiment, the headset 610 comprises a camera (not shown) configured to capture images of the scene in which it is located to display them on the screen 612, optionally after enrichment of said images, for example in the context of an augmented reality application.

[0127] Figure 7 is a schematic representation of a non-limiting exemplary embodiment of an apparatus 710 according to the invention.

[0128] The apparatus 710 of Figure 7 comprises means configured to implement the invention, and in particular any one of the methods 100 and 300 described above.

[0129] In this example, the device 710 is a medical imaging device, such as an endoscope or an ultrasound device, comprising a device according to the invention, in particular the device 400 of FIG. 4, as well as a display screen 712 equipped with a detection surface 714, for example capacitive, and an imaging means formed by a distal objective connected to an imaging module (not shown).

[0130] Figure 8 is a schematic representation of a non-limiting exemplary embodiment of a vehicle according to the invention.

[0131] The vehicle 810 of Figure 8 comprises means configured to implement the invention, and in particular any one of the methods 100 and 300 described above.

[0132] The vehicle 810 of Figure 8 is a land vehicle of the car type, comprising a device according to the invention, in particular the device 400 of Figure 4 and in particular the module 402, as well as one or more display screens 812 each equipped with a detection surface 814, for example capacitive, arranged in the passenger compartment of the vehicle 810. The vehicle 810 further comprises a camera 816, for example arranged on the windshield of the vehicle 810.

[0133] The invention is of course not limited to the embodiments described above as examples. For example, the enlargement phase may comprise, before displaying the new image, a contrast enhancement step according to the enlargement instruction.

Claims

CLAIMS 1. Method (100, 300) for representing a scene on a display medium (410, 512, 612, 712, 812), comprising: - a step of displaying (102), on the display medium, an image (11) of said scene, - at least one iteration of an enlargement phase (104) comprising the following steps: ■ detection (106) of an enlargement instruction for an area of ​​interest (Zl) of the displayed image, ■ obtaining (108, 200) a new image (12) comprising said area of ​​interest (Zl) with a size and a level of sharpness adjusted according to the enlargement instruction, ■ display (110), on the display medium, of the new image (12).

2. Method (100, 300) according to claim 1, wherein the step of obtaining (108, 200) a new image (12) comprises a selection (206) of an image in a stack (PI) of images.

3. Method (100, 300) according to claim 2, wherein the stack (PI) of images comprises images having one or more areas of interest including images in which, for at least one of said areas of interest, this area of ​​interest has a respective size and / or level of sharpness.

4. Method (100, 300) according to claim 2 or 3, in which the selection (206) of an image in the stack (PI) is carried out as a function of information on the position and size of the area of ​​interest associated with each of the images in the stack (PI).

5. Method (100, 300) according to any one of claims 2 to 4, in which the stack (PI) of images comprises at least one image captured by an imaging device.

6. Method (100, 300) according to any one of claims 2 to 5, in which the stack (PI) of images comprises at least one image obtained by calculation or by simulation, from at least one other image.

7. Method (100, 300) according to any one of claims 1 to 6, wherein, during at least one iteration of the enlargement phase (104), the area of ​​interest (Zl) of the new image (12) comprises one or more objects (03) absent from the displayed image (11).

8. Method (100, 300) according to any one of claims 1 to 7, comprising, before the step of displaying (110) the new image (12), a step of enhancing the contrast of the new image (12) as a function of the enlargement instruction.

9. Method (100, 300) according to any one of claims 1 to 8, in which the step of detecting (106) the enlargement instruction comprises detecting an action of a user, such as a rotation of a mouse wheel, a movement of one or more fingers on a touch screen, a prolonged viewing of said area of ​​interest, or even a position of a part of the user's body and / or of a device worn by the user.

10. Method (100) according to any one of claims 1 to 9, comprising several iterations (112) of the enlargement phase (104).

11. A computer program comprising executable instructions which, when executed by a computing device, implement all the steps of a method (100, 300) according to any one of claims 1 to 10.

12. Device (400) comprising means (402) configured to implement all the steps of a method (100, 300) according to any one of claims 1 to 10.

13. Apparatus (510, 610, 710, 810) comprising: - a display support (512, 612, 712, 812), - a means for detecting an enlargement instruction (514, 714, 814, 816), and - means for obtaining an image (402), configured to implement all the steps of a method (100, 300) according to any one of claims 1 to 10.

14. Apparatus (510, 710, 810) according to claim 13, wherein the detection means (514, 714, 814) is formed by the display medium (512, 712, 812).

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