Abstract: A method for obtaining, for at least one pixel of an image sensor comprised in an optical device, parameters defining a pixel beam is described. The method is remarkable in that it includes determining a direction of a chief ray associated with at least one pixel of the image sensor from the features of an optical system associated with the optical device, determining a set of pixels formed in a screen of a display device, the set of pixels comprising at least one pixel close to a point corresponding to an intersection of the chief ray and the screen, and the set of pixels comprising only pixels which are detected by the at least one pixel of the image sensor, when they are illuminated.

Abstract: An optical see-through glass type display device comprises: an image projector projecting a virtual image; a first optical element configured to guide light of the virtual image; and a second optical element having a first reflection surface for reflecting back light coming through the front surface of the second optical element and a second reflection surface for retro-reflecting light coming through the rear surface of the second optical element. The second optical element is switchable between a first state in which the reflection on the first and second reflection surfaces is enabled and a second state in which the reflection on the first and second reflection surfaces is disabled.

Abstract: In one embodiment, it is proposed a method for obtaining at least one high dynamic range image via aligning and fusion of at least two low dynamic range images. The method is remarkable in that it comprises: obtaining a first low dynamic range image, said first low dynamic range image comprising several color components in a color space; obtaining a second low dynamic range image in said color space, comprising, for at least one component color, at least a part of pixels of said second low dynamic range image, defining a region, for which Euclidean distance between a value of a pixel in said region in said second low dynamic range image and a value of a corresponding pixel in said region in said first low dynamic range image is below a threshold; and said aligning comprising matching features obtained from said at least one component color of said first low dynamic range image and from said at least one component color of said second low dynamic range image.

Abstract: A method for presenting an image on a display device (100) includes modifying the image by applying a geometric transformation to the image so that an area of the image on the display device is presented to a viewer with higher density of pixels than that in the rest of the image (S18).

Abstract: A method of calibrating an image acquisition device is described. The method includes emitting at least one light source pattern in an object space of the image acquisition device, adjusting one of the source patterns until an image pattern of the source pattern formed on a sensor of the image acquisition device exhibit a shape which centroid corresponds to a centroid of a reference pixel of the sensor, called a target image pattern and analyzing the adjusted source pattern and estimating therefrom at least one characteristic of a pixel beam directed to the reference pixel from the adjusted source pattern.

Abstract: There are several types of plenoptic devices and camera arrays available on the market, and all these light field acquisition devices have their proprietary file format. However, there is no standard supporting the acquisition and transmission of multi-dimensional information. It is interesting to obtain information related to a correspondence between pixels of a sensor of said optical acquisition system and an object space of said optical acquisition system. Indeed, knowing which portion of the object space of an optical acquisition system a pixel belonging to the sensor of said optical acquisition system is sensing enables the improvement of signal processing operations. The notion of pixel beam, which represents a volume occupied by a set of rays of light in an object space of an optical system of a camera along with a compact format for storing such information is thus introduce.

Abstract: A method for displaying at least one light field based image on a user's device is disclosed. Such a method comprises displaying the image focused according to at least one focusing parameter determined as a function of a pose of the user's device. A sensor embedded in the users' device, which may be a handheld device, may estimate the pose.

Abstract: The present invention provides a method and system for determining and providing color metadata for a downlink data channel. In accordance with the present invention color metadata is determined such that gamut mapping is defined by a transmitted source gamut which enables adapted mapping that preserves saturation and contrast levels of the source for a downlink data channel. The metadata is then provided to a downlink data channel for color management.

Abstract: According to the invention, the mapping operations are subdivided into two main steps: first, a content-dependent mapping of colors from a source content color gamut into an intermediate color gamut which is common to all images to map, and second, a device-dependent mapping of colors from this intermediate color gamut into the target color gamut.

Abstract: In one implementation, the method includes applying color gamut mapping directly to incoming RGB color coordinates resulting in mapped source coordinates R?G?B?. The source coordinates are then transformed into target coordinates R?G?B?. According to another implementation, incoming source coordinates RGB are transformed into target coordinates R?G?B? and the color gamut mapping is applied directly to the target coordinates R?G?B? resulting in mapped target coordinates R?G?B?.

Abstract: The present disclosure improves 3D representation (by means of adjusting disparity between pictures) in stereoscopic or autostereoscopic images in order to better fit the natural viewing geometry by modifying each image of a stereo pair with a geometric transform centered on an intersection point of an imaging plane and a gaze direction for each of eyes. An observer's view is modeled independently for the left and right eyes, and the left and right views are processed independently with the goal to re-align pixel directions for each of eyes to make these directions more in correspondence with natural vision for the observer.

Abstract: The disclosure relates to a visual data processing device and a visual data processing method. The device is used for displaying visual data for a terminal. The device comprises: a module configured to obtaining a three-dimensional position of the terminal with respect to a reference point on a user of the terminal; a module configured to determining, in relation to said three-dimensional position of the terminal, a subset of three-dimensional visual data to be displayed from the point of view of the reference point, in function of a set of available visual data; a module configured to modifying said subset of three-dimensional visual data to be displayed, delivering modified visual data; a module configured to displaying, on a displaying module of the terminal, the modified visual data.

Abstract: In one embodiment, it is proposed a method for obtaining at least one high dynamic range image via aligning and fusion of at least two low dynamic range images. The method is remarkable in that it comprises: obtaining a first low dynamic range image, said first low dynamic range image comprising several color components in a color space; obtaining a second low dynamic range image in said color space, comprising, for at least one component color, at least a part of pixels of said second low dynamic range image, defining a region, for which Euclidean distance between a value of a pixel in said region in said second low dynamic range image and a value of a corresponding pixel in said region in said first low dynamic range image is below a threshold; and said aligning comprising matching features obtained from said at least one component color of said first low dynamic range image and from said at least one component color of said second low dynamic range image.

Abstract: This invention relates to a method for estimating the optical power of corrective lenses in a pair a eyeglasses worn by a spectator, characterized in that it comprises the following steps: acquire two consecutive images of this spectator's face located in front of a means for acquiring these two images, one of these images being acquired with eyeglasses and the other without, calibrate one of the two acquired images with respect to the other, identify the position of the iris of each eye in each image, evaluate the size magnification or size reduction of each imaged iris, and estimate the optical power of the corrective lenses based on the evaluated magnification or reduction.

Abstract: The invention consists in a method of and a device for adapting 3D content to an observer wearing prescription glasses. The method comprises the step of—providing information about prescription glasses of the observer;—calculating a value representative of the optical deviation created by the glasses from the provided information, for a given direction;—estimating a depth adjustment value as a function of the calculated value and—modifying the depth of the 3D content according to the estimated depth adjustment value.

Abstract: A method for image processing of digital image pixels. Pixels are preferably filtered spatially and dithered, and the value for at least one color component is bit reduced. The space freed by the bit reduction is used to allocate a look-up table selection bit that indicates which look-up table (LUT), from a plurality of small LUTs partitioned from a bigger LUT, should be used for the color transform. The transformed pixels are then selected according to the used LUT, format converted and output. The invention, which also covers an apparatus and a pre-processing module, enables an apparatus with a LUT to be used both as a single full-rate LUT apparatus and as a lower-rate n smaller LUT apparatus.

Abstract: The present invention provides a method and system for determining and providing color metadata for a downlink data channel. In accordance with the present invention color metadata is determined such that gamut mapping is defined by a transmitted source gamut which enables adapted mapping that preserves saturation and contrast levels of the source for a downlink data channel. The metadata is then provided to a downlink data channel for color management.

Abstract: A high dynamic picture transmission system is provided. The transmission system includes a coding unit configured to generate a standard bitstream and at least a second bitstream. The standard bitstream coding the pictures such that the luminance of each pixel is coded with a standard dynamic, and the second bitstream contains the information necessary to reconstruct the luminance of high dynamic pictures from the coded luminance with the standard dynamic contained in the standard bitstream.

Abstract: An optical see-through glass type display device comprises: an optical unit having a front correcting surface and a rear correcting surface; an image projector projecting a virtual image; and an image sensor for capturing an ambient scene image. The optical unit is configured to guide light of the ambient scene image coming through the front correcting surface to the image sensor and to guide light of the virtual image so that the light of the virtual image outgoes through the rear correcting surface. A first optical compensation element is located between the optical unit and the image sensor and a second optical compensation element is located between the image projector and the optical unit. The device further comprises a processing module configured to analyze the ambient scene image captured by the image sensor.

Abstract: An optical see-through glass type display device (100) comprises: an image projector (140) projecting a virtual image; a first optical element (130) configured to guide light of the virtual image; and a second optical element (120) having a first reflection surface (122a) for reflecting back light coming through the front surface of the second optical element (120) and a second reflection surface (124a) for retro-reflecting light coming through the rear surface of the second optical element (120). The second optical element (120) is switchable between a first state in which the reflection on the first and second reflection surfaces (122a, 124a) is enabled and a second state in which the reflection on the first and second reflection surfaces (122a, 124a) is disabled.