Abstract:
The present disclosure relates to a method for processing a video of a scene, the method comprising: - receiving (S1) a 3D representation of the scene, - determining (S2) into said 3D representation at least one candidate object, said at least one candidate object comprising a cloud of 3D points, - selecting (S3), among said at least one candidate object, one object to be removed, - computing (S4) a signature of the object to be removed, said signature being representative of 3D features of said selected object, - determining (S5) a substitute object from a plurality of candidate substitute objects of a library, each candidate substitute object having a signature, said determination being based on comparison of signatures, and - replacing (S6) the object to be removed by said substitute object into said video scene.
Abstract:
The spatial frequency analysis contained in the compressed image is used not only for decompression of images but also for the selection of an appropriate gamut mapping algorithm. Computation resources are then saved because no specific spatial frequency analysis is required for the selection of an appropriate gamut mapping algorithm.
Abstract:
The present invention is in the field of Content protection, most particularly in cinema venues where camcorder acquisition followed by immediate illegal distribution creates important revenue losses for content owners. It is known that anti-camcorder systems using a color modulation can be circumvented by using low shutter speed in the camcorder. Today, the shutter speed is determined automatically by the camcorder as a function of the filmed video source. In automatic configurations, shutter speed self-adapts to either motion, or flicker detection, both of which taking into account brightness variations only. The proposed invention proposes a dual color/brightness modulation to defeat automatic shutter speed adjustment. For example, a color modulation at 50/60 Hz is carried out and a brightness modulation at a higher frequency 100/120 Hz is added to force the camcorder to work at a high shutter speed.
Abstract:
The invention discloses a new modulation scheme to prevent illegal copy in movie theaters. None of the existing modulation schemes make the right assumptions to modelize a camcorder device. In such classical schemes, camcorders are always considered as sampling devices without taking into account the effects of shutter speed. The shutter of the camcorder is classically compared to a low-pass filter. As a result, modulation effects can be easily removed by setting up shutter speed to low values (low cutoff frequency). The right mathematical modelization of the shutter effect shows that, in the spectral domain, the behavior of the camcorder is close to a cardinal sine function with a main lobe and sidelobes. Consequently, according to the invention, it is proposed to select a modulation frequency that not only generates visual artifacts once recorded by the camcorder under shutter-free conditions, but that can also generate artifacts despite low shutter speed settings by going through sidelobe of the shutter spectrum.
Abstract:
High Dynamic Range (HDR) imaging allows a significantly greater dynamic range than normal digital imaging techniques. HDR imaging devices should also be able to process or display video data having 8 bits/sample per colour, whereby it is desirable that quantisation artefacts are removed and signal dynamics are enhanced. The inventive processing reduces quantisation artefacts and provides rich dynamic content by generating using the normal law from the 8-bit quantised image an HDR initialisation image followed by image content geometry-driven Gaussian kernel filtering.
Abstract:
The present invention relates to the domain of control devices for virtual games, and more specifically to a control device to control the displacement of a virtual player and of a virtual ball in the scope of a football video game. According to the invention, the control device is in the form of a ball connected to a pedestal. This ball is equipped with accelerometers (18) able to detect a displacement force on the ball as a result of a strike exerted on said ball, pressure sensors (19) able to detect a pressure force exerted on the surface of the ball and a processing module (16). The processor module generates using information from the accelerometers and pressure sensors control signals (S1) to control the displacement of the virtual ball in the video game and control signals (S2) to control the displacement of the virtual player in the video game.
Abstract:
A Braille display system and a method for operating a refreshable Braille display 14 is provided. A string of characters is assigned to a drive signal for specifying the activation or deactivation of a tuple of dots which are raised through holes in a touch and sense surface of the Braille display 14 upon activation and which are retracted upon deactivation. The Braille display 14 is driven by a drive signal which is configured to activate and/or to deactivate the tuple of dots so as to generate a dynamic tactile display of said string of characters. The time dependent characteristic of activation and/or deactivation of the tuple of dots is defined by the string of characters.
Abstract:
In the method according to the invention, the choice among Q different N-tuples for the control of the display device is performed for each pixel of an image to reproduce in order to minimize the difference of perceptions of the colour generated by the display device among the various observers.
Abstract:
To capture an image, the image sensing period of this image is subdivided into a plurality of successive illumination periods, and the value which is assigned to each pixel to capture the image is the sum of the integrals of intensity of illumination of this pixel over each of said successive illumination periods. According to the invention, this sum is weighted by an apodization function in order to emulate a mechanical shutter. Temporal aliasing issues and temporal ringing artifacts of digital imaging are prevented or at least limited.