48 results about "Parallel projection" patented technology

An apparatus and method for real-time volume processing and universal three-dimensional rendering. The apparatus includes a plurality of three-dimensional (3D) memory units; at least one pixel bus for providing global horizontal communication; a plurality of rendering pipelines; at least one geometry bus; and a control unit. The apparatus includes a block processor having a circular ray integration pipeline for processing voxel data and ray data. Rays are generally processed in image order thus permitting great flexibility (e.g., perspective projection, global illumination). The block processor includes a splatting unit and a scattering unit. A method for casting shadows and performing global illumination in relation to light sources includes sweeping a two dimensional array of rays through the volume can also be implemented with the apparatus. A method for approximating a perspective projection includes using parallel projection.

Embodiments of the present disclosure are directed to a system for generating three-dimensional images of a target region of a patient. The system may include at least one computer system. The computer system may be configured to receive a plurality of non-parallel projection images of the target region of the patient, convert the plurality of non-parallel projection images into a non- spatial domain, reconstruct a three-dimensional image from the plurality of non- parallel projection images in the non-spatial domain, and convert the reconstructed three-dimensional image from the non-spatial domain to the spatial domain.

The invention discloses a sphere illustrative diagram, a composition method of the North Pole position thereof and a used template. The used template is characterized by comprising a meridian template and a latitude line template. The method of using the template to determine the North Pole position comprises the steps: in the T parallel projection direction, a sphere center O is taken as a circle center, the minor semi-axis of an equator ellipse is used as a radius for drawing a circle, and the circle and the major semi-axis of the equator ellipse intersect at a point A; the points A and O are connected; a vertical line of AO is drawn through the circle center O toward the North Pole direction of a sphere and intersects with a contour circle of the sphere at a point D; a vertical line of AO is drawn through the point A toward the North Pole direction of the sphere and intersects with the contour circle of the sphere at a point B; a parallel line of AO is drawn through the point B to obtain a point of intersection C where the parallel line intersects with DO, and the point of intersection C is the North Pole position of the sphere illustrative diagram. The determination method of South Pole position and the determination method of the North Pole position are identical, but the directions are opposite. Meridians of the sphere are drawn through the North Pole and the South Pole to complete the drawing of the sphere illustrative diagram. The meridians and latitude lines of the sphere in a general state can be conveniently drawn by the template.

The invention discloses a radiation energy density simulation method of a focusing type heliostat in a tower type solar thermal power station, which belongs to the technical field of tower type solarthermal power station simulation, and comprises the following steps: (1) determining the relative positions of sub-plane mirrors in local coordinates, and integrally adjusting the positions and orientations of the sub-plane mirrors according to the incident direction of sunlight; (2) defining an approximate imaging plane according to the reflected light direction of the focusing type heliostat; (3) uniformly dividing the three-dimensional space, and calculating heliostats having shadow and shielding relationships with the heliostats; (4) performing rasterization representation on the approximate imaging plane; (5) calculating radiation energy density distribution on the virtual imaging plane; and (6) projecting the radiation energy density distribution on the virtual imaging plane to a receiving plane through oblique parallel projection. The convolution assignment law and the approximate imaging plane are utilized to obtain the accumulation of the projection areas of the sub-plane mirrors, i.e., the weighted effective reflection areas, so that the solving efficiency of the focusing type heliostat model is improved.