915 results about "Texture mapping" patented technology

Techniques of adapting an advertisement previously broadcast or in the process of being broadcast are disclosed. An advertisement selection factor is generated in order to adapt ads to a particular recipient. The advertisement selection factor can be derived from a database of information concerning the recipient and/or from data input by the recipient. The ad may be adapted in a variety of ways including replacing a broadcast ad segment with another segment. The replacement ad segment may be stored in a local device such as a set-top box or hardware card of a TV or PC and selected according to the advertisement selection factor. The replacement ad segment is synchronized with the on-going broadcast to produce a seamless ad. Alternatively, an ad processing can change audio or visual characteristics of the ad according to the ad selection factor. Such ad processing also includes dynamical texture mapping, object replacement, object addition, and audio/video data layering. The ad processing may also be combined with ad segment replacement. The result is a broadcast advertisement specifically targeted for a recipient and thereby likely to have a greater impact on that recipient's buying patterns. These techniques may also be applied to a variety of content such as sitcoms and sports shows to adapt the content to a particular recipient.

An invention is provided for rendering using an omnidirectional light. A shadow cube texture map having six cube faces centered by a light source is generated. Each cube face comprises a shadow texture having depth data from a perspective of the light source. In addition, each cube face is associated with an axis of a three-dimensional coordinate system. For each object fragment rendered from the camera's perspective a light-to-surface vector is defined from the light source to the object fragment, and particular texels within particular cube faces are selected based on the light-to-surface vector. The texel values are tested against a depth value computed from the light to surface vector. The object fragment is textured as in light or shadow according to the outcome of the test.

Methods and systems for producing three-dimensional images of a scene using relief textures include modeling surfaces in a scene with one or more relief textures. Each relief texture is projected onto its basis plane based on a desired viewpoint to produce a pre-warped image. Each pre-warped image is projected onto one or more polygons used to model the scene. Because the steps of texture mapping and pre-warping are separated, solving for visibility during the pre-warping is facilitated by using one-dimensional pre-warping equations

A multi-resolution texture mapping system suitable for large scale terrain rendering using commodity graphics processing units (GPU). The GPU vertex and fragment shaders are used to implement the clip-mapping functionality. The terrain texture is represented by a combination of a mip-map and a multi-level clip-map having independent origins and off-set values. The independent clip-map levels may be independently updated. The offset values allow the origins to be associated with a reference point in a scene to be rendered. The desired clip-map level to be used to render a particular fragment may be determined using the base 2 logarithm of the maximum screen-space derivative of the source texture required by the terrain geometry to be drawn. If the desired clip-map level is non-integer and lies between two clip-map levels, appropriate texel data is created by interpolating between the bounding clip-map levels. This interpolation allows a multi-resolution texture mapping to be displayed.

The present invention is directed to a real-time controllable reflection mapping function which covers all stereoscopic directions of space. More specifically, the surface of a mirrored object is segmented into a plurality of polygonal elements (for example, triangles). Then, a polyhedron, which includes a predetermined point (for example, the center of the mirrored object) in a three-dimensional space (for example, a cube) in the interior thereof, is generated and a rendering process is performed for each surface of the polyhedron with the predetermined point as a view point. The rendered image is stored. Thereafter, a reflection vector is calculated between each vertex of the polygonal elements and a view point used when the entire three-dimensional space is rendered. Next, the surface of the polyhedron, in which an intersecting point between the reflection vector with the predetermined point as a start point and the polyhedron exists, is obtained. The coordinate in the image, which corresponds to each vertex of the polygonal elements, is calculated by using the surface where the intersecting point exists and the reflection vector. The image is texture-mapped onto the surface of the object by using the coordinate in the image which corresponds to each vertex of the polygonal elements. Finally, the result of the texture mapping is displayed.

The invention discloses a three-dimensional head model reconstruction method. The method comprises the following steps of: S1: inputting a front image and a side image of a human face; S2: extracting feature points of face and hair regions in the image; S3: generating a three-dimensional head model according to the deformation of the facial feature points; S4: generating seamless overall head textures according to the image; S5: mapping all textures to the deformed three-dimensional head model; S6: fitting the hair region by using a coons surface according to the feature points of the hair region; and S7: performing coons surface deformation and texture mapping. The method is simple and practical, has low computation complexity and can actually reconstruct the three-dimensional head model on the premise of high precision.

A vehicle control system uses a touchscreen display to displaying a graphical HMI and detect a contact point where touched by a user's finger. A haptic texture system has an electrode disposed across the touchscreen display and a signal generator generating an oscillating signal to produce a potential difference between the finger and the electrode resulting in a corresponding perceived texture as the finger slides over the touchscreen. A control circuit is configured to set at least a frequency or amplitude of the oscillating signal to vary the perceived texture according to first and second modes while navigating the graphical HMI. The first mode uses a localized texture mapping defined by respective feature icon selection regions on the touchscreen display. The second mode uses a status texture mapping relating the perceived texture to each potential adjustment setting available for a feature icon that has been selected using the first mode.

The present invention discloses a physical three-dimensional model automatic modeling method which comprises the following steps of (1) collecting a turntable point cloud and a modeling object point cloud, and carrying out real-time registration to obtain a mixed point cloud of an object and a turntable, (2) carrying out point cloud pretreatment to obtain the surface point cloud of a model object with a bottom surface point, (3) carrying out surface reconstruction to obtain the three-dimensional surface model of the object, (4) carrying out model simplification treatment on the three-dimensional surface model, and establishing the three-dimensional simplified surface model of the object, (5) carrying out texture mapping on the three-dimensional simplified surface model, and (6) carrying out model rendering on the three-dimensional model which is subjected to texture mapping to generate a two-dimensional image. The method has the advantages that the system operation is stable and reliable, the automation is realized in the operation process, a rebuilding effect is good, and the application needs of different simulation scenes can be satisfied by a built multi-granularity three-dimensional model.

The invention discloses a real human body three-dimensional modeling method specific to personalized virtual fitting. According to the method, a video is used as input data; and several steps of feature matching, key frame selection, three-dimensional point cloud generation, template mapping, and texture mapping and the like are carried out to obtain a human body surface three-dimensional model. Because of the motion recovery structure technology, the reconstruction process is substantially simplified, the burdens of the data collection people and the collected people can be reduced, and the requirements on the instrument and equipment are reduced. Meanwhile, a precise reconstruction result can be obtained. A complete human body surface model is obtained based on template mapping; and thus the method has high robustness on the human body texture information missing and self-shielding. Therefore, only a plurality of control points need to be marked manually before template mapping from the data input to model output and other process is completed automatically. The model that is obtained based on reconstruction can be applied to the game and animation design, movie and television special efficacy, and personalized virtual fit and the like.

Aspects of the present invention include systems and methods for recalibrating projector-camera systems. In embodiments, systems and methods are able to recalibrate automatically the projector with arbitrary intrinsic and pose, as well as render for arbitrarily desired viewing point. In contrast to previous methods, the methods disclosed herein use the observing camera and the projector to form a stereo pair. Structured light is used to perform pixel-level fine reconstruction of the display surface. In embodiments, the geometric warping is implemented as a direct texture mapping problem. As a result, re-calibration of the projector movement is performed by simply computing the new projection matrix and setting it as a camera matrix. For re-calibrating the new view point, the texture mapping is modified according to the new camera matrix.

It uses a 3D model of reference human face (HF) to estimate the HF gesture parameters in the input stereo image (ISI) pair to generate the virtual image (VI) pair of reference HF (RHF) under the same gesture. Due to the corresponding between VIs is known, the corresponding is extended from VI to ISI via calculating the correspondence between the input HF and RHF under the same gesture. This greatly improves the matching effect of HF stereo image pair and ensures the HF point-cloud (PC) data more accurate obtained from calculating stereovision difference. This method converts 3D PD optimizing problem into a 1D curve optimizing one to greatly raise processing speed. It finally builds HF 3D surface from the optimized PC, then texture-mapping it to gain a HF 3D model (H3M) with a high true sense. This invention can meet various requirements against H3M under various practical application situations. It is practical, fast, accurate and has a extensive application foreground.

The invention relates to a three-dimensional facial reconstruction method, which can automatically reconstruct a three-dimensional facial model from a single front face image and puts forward two schemes. The first scheme is as follows: a deformable face model is generated off line; Adaboost is utilized to automatically detect face positions in the inputted image; an active appearance model is utilized to automatically locate key points on the face in the inputted image; based on the shape components of the deformable face model and the key points of the face on the image, the geometry of a three-dimensional face is reconstructed; with a shape-free texture as a target image, the texture components of the deformable face model are utilized to fit face textures, so that a whole face texture is obtained; and after texture mapping, a reconstructed result is obtained. The second scheme has the following differences from the first scheme: after the geometry of the three-dimensional face is reconstructed, face texture fitting is not carried out, but the inputted image is directly used as a texture image as a reconstructed result. The first scheme is applicable to fields such as film and television making and three-dimensional face recognition, and the reconstruction speed of the second scheme is high.

A method and apparatus for distributing the workload of rendering an image where texture mapping is involved among multiple graphics processing units (GPUs) are provided. The method generally entails dividing a texture map among multiple GPUs, performing texture mapping in each GPU to render image data in each GPU's frame buffer, combining the image data from each frame buffer, and scanning out the combined image to a display.

A method of reconstructing a 3D model includes reconstructing a 3D voxel-based visual hull model using input images of an object captured by a multi view camera; converting the 3D voxel-based visual hull model into a mesh model; and generating a result of view-dependent rendering of a 3D model by performing the view-dependent texture mapping on the mesh model obtained through the conversion. Further, the reconstructing includes defining a 3D voxel space to be reconstructed; and excluding voxels not belonging to the object from the defined 3D voxel space.

The invention discloses a multi-view texture mapping method. The method can be used for carrying out high-realistic texture mapping on a three-dimensional model by an image sequence shot in multiple angles. The method comprises the steps of firstly converting multi-view texture mapping into a Markov random field problem, and obtaining an optimal texture image corresponding relation of each patch by an energy optimization method; then simplifying mapped texture data, and restoring invalid textures in part of invisible regions; finally eliminating the color difference of spliced boundaries of textures by a gradient merge method, and obtaining a seamless texture mapping effect. Compared with the conventional method, the method disclosed by the invention has obvious advantages in the two aspects of mapping of complicated sheltered textures and merging of large texture data in the model; high-quality texture mapping is still generated in a complicated scene; examples in a series of complicated scenes show the effectiveness and the robustness of the method.

The invention discloses a realistic face generating method based on a single photo. The method comprises steps of firstly constructing a standard face model base, interactively selecting face feature points of an input picture and based on face profile features, matching an optimal model; secondly, via the triangle deformation and the bilinearity interpolation method, realizing texture mapping from the picture to a three-dimensional model, and by introducing an Alpha graph, realizing fusion transition from face covering textures to model neutral textures; and at last, by adopting the grid adjusting method, hierarchically adjusting the model from the whole to the details so as to achieve an objective of a realistic three-dimensional face. The method is user-friendly and requires quite few feature points; and just with one full face photo and quite few feature points, a user can participate in an autonomously finished realistic face establishing method.