55 results about "Orientation field" patented technology

A method, apparatus, and article of manufacture provide the ability to control a three-dimensional scene view. A three-dimensional (3D) scene having one or more three-dimensional objects is displayed. A 3D representation of a coordinate system of the scene is displayed. The 3D representation contains a current viewpoint, one or more faces, one or more edges, and one or more corners with each face, edge, and corner representing a corresponding viewpoint of the scene. The 3D representation is manipulated. A new current viewpoint of the 3D representation is displayed based on the manipulation. The scene is then reoriented corresponding to the new current viewpoint based on the manipulation of the 3D representation.

A system and method are directed to determining light illumination in a graphical environment. One or more light sources are illuminating a surface. The surface is divided into one or more cells. The orientation of each cell is determined and saved in an orientation field. A multidimensional light map value is derived and associated with the surface. The multidimensional light map value defines the combined illumination of the one or more light sources on the surface, and may optionally be a vector. At least one cell to be drawn is determined. For each cell to be drawn, an illumination value associated with that cell to be drawn is determined. The illumination value is based on the orientation field and the multidimensional light map value. The illumination value may be the dot product of the orientation field and the multidimensional light map value.

The present invention relates to a method of identifying a target object in an image using image processing. It further relates to apparatus and computer software implementing the method. The method includes storing template data representing a template orientation field indicative of an orientation of each of a plurality of features of a template object; receiving image data representing the image; processing the image data to generate an image orientation field indicating an orientation corresponding to the plurality of image features; processing the image orientation field using the template orientation field to generate a match metric indicative of an extent of matching between at least part of the template orientation field and at least part of the image orientation field; and using the match metric to determine whether or not the target object has been identified in the image. Image and / or template confidence data is used to generate the match metric.

A “texture generator” uses an inverse texture synthesis solution that runs in the opposite direction to traditional forward synthesis techniques to construct 2D texture compactions for use by a graphics processing unit (GPU) of a computer system. These small 2D texture compactions generally summarize an original globally variant texture or image, and are used to reconstruct the original texture or image, or to re-synthesize new textures or images under user-supplied constraints. In various embodiments, the texture generator uses the texture compaction to provide real-time synthesis of globally variant textures on a GPU, where texture memory is generally too small for large textures. Further, the texture generator provides an optimization framework for inverse texture synthesis which ensures that each input region is properly encoded in the output compaction. In addition, the texture generator also computes orientation fields for anisotropic textures containing both low- and high-frequency regions.

A method for registering a fingerprint image is provided. The method comprises steps of: establishing an orientation field template base according to M training fingerprints, wherein M is a positive integer larger than one; receiving a fingerprint image to be registered; obtaining an initial orientation field of the fingerprint image; obtaining an estimated position and an estimated direction of the fingerprint image according to the initial orientation field and the orientation field template base; and registering the fingerprint image according to a preset position, a preset direction, the estimated position and the estimated direction.

The invention discloses a method for extracting a fingerprint direction field under a Morkov random field based on priori knowledge. The problems of incapability of accurately extracting fingerprint direction field information in a low-quality area and high generation rate of pseudo-singular point information in a model method in the prior art are mainly solved. The method is implemented by the following steps of: (1) inputting a fingerprint image, extracting the priori knowledge of a direction field of the fingerprint image, obtaining a block angle matrix of the fingerprint image by using a gradient method, and obtaining the probabilities of block angles by using a statistical method; (2) fitting the priori knowledge of the direction field, the obtained block angle matrix and the probabilities of the block angles, and constructing a priori-knowledge-based Morkov random field model of the fingerprint image; and (3) extracting a final direction field of the fingerprint image by using the constructed model. The priori knowledge of the fingerprint direction field is fitted on the basis of the conventional Morkov random field, and a new fingerprint direction field extraction model is constructed, so that the matching and retrieval performance of the fingerprint image are improved, and the method can be used for extracting the direction field of a low-quality fingerprint image.

The invention discloses a permanent-magnet material resistant to high temperature and with high magnetic performance. The mass of the permanent-magnet material comprises 100 parts of Nd2Fe14B magnetic powder, 0.1-0.3 part of ferrocene magnetic powder, 0.1-5 parts of titanate coupling agent, 1-10 parts of bisphenol A epoxy resin and 0.2-3 parts of graphene oxide powder, and a cured material is formed after uniformly mixing the raw materials in a composite environment of a temperature field with a constant temperature being 20-200 DEG C and an orientation field with field magnetic intensity being 0.5-3T. With the permanent-magnet material provided by the invention, the defect of unfavorable temperature resistance of a bonded NdFeB material is improved, the application range of the bonded NdFeB material is expanded, the defect of low application temperature of the bonded NdFeB material can be made up, the magnetic performance of the magnet under high temperature is greatly improved, the weight loss of the magnet can be effectively reduced, and the corrosion resistance of the magnet is improved.