摘要:
A method for processing a 3D scene and a corresponding apparatus are disclosed. A 3D position of at least one point light source of the 3D scene is determined (10) from information representative of 3D geometry of the scene. Then, an occlusion attenuation coefficient assigned to said at least one point light source is calculated (11) from an occluded area and an unoccluded area, said occluded area and said unoccluded area only differing in that said at least one point light source is occluded by an object in said occluded area and said at least one point light source is not occluded in said unoccluded area,. Color intensity of at least one pixel of the 3D scene can thus be modified (12) using at least said occlusion attenuation coefficient.
摘要:
In order to blur a virtual object in a video in real time as the video is acquired by a device capturing a real scene, a salient idea comprises estimating an apparent motion vector between two successive images, being captured at two successive device poses, wherein the apparent motion vector estimation is based on a motion of the device. The successive images are then filtered based on the estimated apparent motion vector.
摘要:
A method, apparatus and system for the determination of normal and reflectance parameters using sequential illumination and recorded depth information include illuminating a scene using a light source such that every other frame of the scene recorded by a camera is illuminated by the multiplexed light source. Depth data of the scene is recorded concurrent with the recording of the scene by the camera. A light source contribution image for the scene is determined using a difference between recorded images containing the light source illumination and recorded images not containing the multiplexed light source illumination. Finally, the normal and reflectance parameters are determined using the recorded depth information and the light source contribution image.
摘要:
The invention relates to a method for generating a motion field between a current frame and a reference frame belonging to a video sequence from an input set of elementary motion fields. The method comprises the following steps performed for each pixel belonging to said current frame: determining a plurality of candidate motion vectors between the current frame and the reference frame wherein each candidate motion vector is the result of the sum of a first motion vector between the current frame and an intermediary frame belonging to the video sequence and of a second motion vector between the intermediary frame and the reference frame; and selecting a motion vector among candidate motion vectors. The method is remarkable in that the first motion vector belongs to the input set of elementary motion fields and the second motion vector belongs to a set of previously selected motion vectors for other current frames of the video sequence.
摘要:
The invention concerns a device and a method for generating on a defined display screen of determined size a 3D image including a left view and a right view from an incoming video signal to be viewed at a distance by a viewer. The device comprises: Means for measuring the distance between the viewer and the display; means for determining a disparity threshold value in relation with the determined size of the display screen and the measured distance to achieve a 2D and 3D compatibility level; means for editing a disparity map corresponding to the values of disparity between the left and the right views; means for analyzing with an histogram the disparity values of the disparity map in comparison to the determined threshold value; and means for replacing one of the left or right view by a view interpolation so that the disparity level of the histogram is below the determined threshold value, if the disparity level of the histogram is above the determined disparity threshold value.
摘要:
The invention proposes a new motion layer extraction method using reference layer mosaics. One motivation is to work with distant images (whose motion in between is more discriminative) while reducing the number of pairs of images to be handled benefiting from the fact that layer mosaics represent the video sequence in a compact way. In this model, not only extracted layer supports for mosaicing are used but also layer mosaics for motion segmentation. In the proposed approach, instead of linking temporally many images pairs from the sequence, the currently processed original image is linked temporally with two sets of motion layer mosaics only. Thus a new image-to-mosaic data term replaces the usual image-to-image motion data term in the objective classification function.
摘要:
Fully scalable encoder and decoder for interlaced video A method for encoding an interlaced sequence of digital video data decomposes the interlaced video sequence (I) into first (F1) and second (F2) fields, performs digital filtering (SF1) to get lower frequency (L) and higher frequency (H) component signals of the first fields (F1), and uses spatio-temporal filtering (STF) and motion estimation (ME1) for generating base layer signals (P, MV1) being suitable for reconstruction of a progressive mode video sequence (V1,V2) in a receiver. Advantageously, both the spatio-temporal filter (STF) at the encoder, and the inverse process (STS) at the receiver, can perform scaling in spatial and temporal dimension. The second fields (F2) are used to generate enhancement signals (FF2, MV2), which enable a receiver to reproduce an interlaced video sequence of the full, or scaled, spatial and/or temporal resolution.
摘要:
In situation where a capturing device is capturing a first image of a scene comprising a display device displaying a second image, a salient idea is to send both the captured first image and the second image, being displayed by the display device to a processing device, for comparatively processing the first and the second image to determine a characteristic associated with the display device. Being able to process the first image (comprising a displayed second image) together with the original second image advantageously allows to determine various characteristics associated with the display device that altered the displayed second image within the first image, making it different from the initial second image. Characteristics associated with the display device are for example a specular reflection occurring on the display device in the scene and disturbing the capture of the scene. In a second and non-limiting example a characteristic of the display device is the color reproduction function of the display device that makes the displayed second image within a displayed first image be different from the displayed second image in the scene.