102 results about "Drop shadow" patented technology

A methodology for generating a drop shadow effect for objects in a graphical user interface is presented. A first object in a presentation space occludes the illumination from a simulated light source, and a dynamically determined drop shadow from the first object may partially occlude a second object. A portion of a drop shadow from the first object is shown on the second object; the portion of the drop shadow from the first object is displaced from the first object in direct proportion to a z-depth difference between the first object and the second object. Hence, a drop shadow can be generated in a computationally inexpensive manner, and the dynamically determined drop shadow enhances the perception of depth within the presentation space by a user.

The invention discloses a method for automatic correction and tiled display of plug-and-play large screen projections. The method comprises the steps as follows: adaptively generating a checker pattern with a certain resolution ratio, projecting by projectors in sequence, capturing by cameras, carrying out feature detection and identification on complicated projection surfaces or checkers under the illumination condition with a multi-feature detection method based on color and geometry, and creating a Bezier curve function to represent a corresponding relation of points between projector images and camera images; and obtaining effective display areas for screen projection with a quick approach method, determining a corresponding relation of the projection contents of the projectors and the display areas, carrying out geometrical distortion on the images to be projected for geometrical correction, and calculating weight values of pixels in projection overlapping areas with a distance-based nonlinear weight value distribution method for fusion of edge brightness. According to the invention, a plurality of projection images of irregular surfaces can be aligned and seamlessly spliced, and the whole method is simple and easy to use, higher in autonomy and better in seamless splicing performance.

The invention discloses a parameterized and automatic geometric correction method for multi-projector tiled display. The method comprises two parts, namely, off-line correction and real-time correction. The off-line correction comprises steps as follows: two stereo cameras acquire mode image sequences projected by respective projection channels, feature point information of the respective projection channels on screens is acquired through calculation from the acquired mode image sequences, and unknown parameters in geometric models in the projection screens as well as inner and outer parameters of respective projectors are calculated accordingly, position and posture information of an observer is acquired, and all the unknown parameters in geometric models in a projection system are acquired finally. The real-time correction comprises steps as follows: the acquired parameters are used as system configuration files, the system configuration files are loaded in real time, and a rendered multi-channel display image is a high-resolution image which is correct in perspective relation and free of edge mutation. The method has the advantages as follows: parameter calibration of the multi-projector display system can be finished automatically, and the requirement for the resolution and field angles of the cameras is lower.

The invention relates to a multi-screen splicing method, a multi-screen splicing device and a multi-projection splicing large screen. The method comprises the following steps of observing a multi-screen model according to an analog camera arranged on an observation position, observing to acquire a proportion of the size of each screen of a multi-screen image, segmenting a received main frame imageaccording to the observed proportion of the size of each screen to acquire a sub-picture corresponding to each screen, stretching the sub-picture according to an actual resolution ratio of each screen on an observation site to acquire a sub-image actually displayed on each screen, and separately displaying the sub-image on each screen. According to the multi-screen splicing method, the scheme operation process is simple and efficient, and the quick splicing and displaying effect of the multiple screens can be achieved.

The invention discloses a multi-view desktop type three-dimensional display device, comprising two projector arrays which are symmetrically distributed, two longitudinal diffusion screens and a desktop structure, wherein the first projector array is placed at one side of the first longitudinal diffusion screen; the second projector array is placed at one side of the second longitudinal diffusion screen; the desktop can be a square-hole-shaped desktop or middle-opened L-shaped desktop; the two longitudinal diffusion screens are embedded in the desktop structure to form a V shape, a right angle, a trapezoid or an arc; and the two projector arrays project images to the center of the desktop through the corresponding diffusion screens. The multi-view desktop type three-dimensional display device provided by the invention has the advantages that high image resolution and high view resolution can be generated and exquisite transverse-parallax three-dimensional images can be observed in large field ranges of two sides or one side of the desktop. Through the structure of embedding in the desktop, the suspension effect of the three-dimensional images can be realized. Relative to a single naked-eye stereoscopic display, the split joint of the three-dimensional images can be realized via the setting of multi-projection so that the space scale of the three-dimensional images is greatly increased.

The invention discloses a method based on cubic texture shadow mapping in order to overcome the shortcomings that shadow edges are ubiquitously too hard in shadow mapping at present, and real soft shadows cannot be achieved. The shadow edges are softened in a special optimization mode, jags are eliminated, and satisfactory soft shadow effects of point light sources are achieved. The method includes the steps: judging whether the point light sources in a scene are visual point light sources or not by calculating whether a visual angle cone and a point light source illumination sphere are intersected or not to obtain a visual point light source list; judging whether each visual point light source is a potential projector or not by calculating whether the point light source illumination sphere and a spherical bounding box in the scene are intersected or not to obtain a potential projector list; rendering the potential projector into a cubic texture for each visual point light source; and performing scene illumination rendering for each visual point light source and optimizing shadow edge quality by a percentage approach filtering algorithm during shadow processing.

The invention relates to a construction method capable of measuring a panoramic picture, which comprises the following steps of: 1) performing cylindrical projection on horizontal view angle original pictures acquired by a stereoscopic camera in a 360-degree range; 2) extracting control points from cylindrical pictures after the cylindrical projection by adopting a scale-invariant feature transform (SIFT) algorithm, and then calculating relative postures of other pictures through the control points by taking one of the pictures as a basis; 3) splicing the cylindrical pictures after the cylindrical projection according to the relative postures of the other pictures to generate the panoramic picture; and 4) reversely projecting the panoramic picture to a plane, establishing a linkage relationship of the panoramic picture and the original pictures, then selecting any point on the panoramic picture to obtain pixel coordinates of the point on the original pictures through inverse computation, and finally measuring the coordinates, the distance and the slope gradient of the point according to calibrated stereoscopic camera parameters through a forward intersection principle. The construction method not only realizes the measurement of the panoramic picture, but also can actually reflect three-dimensional geographic information.

The invention discloses a method for guiding drawing. The method comprises the following steps: receiving drawing information of a user; extracting a line profile from the drawing information according to an image recognition technology and recognizing different foreground and background objects; analyzing the change rule of thickness, smoothness and length; performing linear detection on the objects and recognizing an apparent horizon and a central point; performing picture processing and illumination analysis; recognizing highlight, shadow and projection in the image; appointing a drawing style as a limiting condition; guiding the drawing information image of the user; giving a correcting suggestion. According to the method, the user can know the difference and defect of the drawing skill in a drawing process according to the freehand sketching of the user, an image analysis recognition technology and an intelligent data comparison technique based on the drawing principle. No manual intervention exists in the whole process, so that the drawing efficiency of the user is increased and the study cost is reduced.

A zirconium alloy that is resistant to shadow corrosion for a boiling water nuclear reactor fuel assembly component, the alloy being characterized in that:

• • its composition in percentages by weight is as follows:
    • Nb=0.4%-4.5%
    • Sn=0.20%-1.7%
    • Fe=0.05%-0.45%
    • Fe+Cr+Ni+V=0.05%-0.45%, with Nb≦9×[0.5−(Fe+Cr+V+Ni)]
    • S=traces-400 ppm
    • C=traces-200 ppm
    • Si=traces-120 ppm
    • O=600 ppm-1800 ppm
    • the balance being Zr and impurities from processing;
  • in that, during fabrication, after its last hot deformation, it is subjected to one or more heat treatments lying in the range 450° C. to 610° C. for a total duration of at least 4 h, with at least one cold rolling operation with a rolling ratio of at least 25%; and
  • in that a final heat treatment operation is performed at a temperature in the range 450° C. to 610° C. for 1 minute to 20 hours.

A fuel assembly component made of the alloy, a fuel assembly including the component, and the use thereof.

The invention discloses a three-dimensional perspective transforming method of two-dimensional graphics, which comprises the following steps of: skeleton drawing; node mapping: mapping nodes on a two-dimensional molding graphic onto a skeleton according to the corresponding relation between the two-dimensional molding graphic and the skeleton as well as distances and orientation; skeleton adjustment: carrying out the three-shaft rotation of the skeleton by respectively passing around a rotating point and a rotating shaft, and carrying out three-dimensional adjustment; node back-projection: back-projecting the nodes into a three-dimensional space according to the orientation parameters of the nodes projected onto the skeleton by adopting a reverse calculating method, so as to obtain an adjusted three-dimensional modeling graphic object; and projection mapping of a three-dimensional modeling graphic: projecting the three-dimensional molding graphic of the three-dimensional space onto an appointed plane according to the position of a view point to obtain a two-dimensional perspective effect graphic. Through the mode, by adopting the three-dimensional perspective transforming method of the two-dimensional graphics provided by the invention, the efficiency of perspective adjustment in the producing process of two-dimensional cartoons is effectively improved, and the quality of the cartoons is effectively ensured while the cost is saved.

The invention relates to a 3D display device, in particular to a multi-viewpoint 3D display device. The multi-viewpoint 3D display device comprises a 3D display device body, the 3D display device body comprises a projection screen and a projection unit, and the projection unit comprises at least three projectors for showing different viewpoint scenes. The projectors project to the projection screen which is a transmittance type diffuser screen with different projection angles, and a cylindrical surface grating is arranged on the light-emitting face of the transmittance type diffuser screen. The transmittance type diffuser screen with different projection angles is adopted for being combined with the projectors for showing different viewpoint scenes, in this way, pictures shown by the projectors for showing different scenes are projected in different directions through the transmittance type diffuser screen, and then people can enjoy different pictures from different viewpoints.

Methods, program products and systems for automatically trapping drop shadows. For at least one segment incident to an atomic region which includes a drop shadow, and for each side of the segment, determining a first flattened color of the side's incident atomic region, and if the atomic region includes a drop shadow, additionally determining a second flattened color omitting the color of the drop shadow. An effective neutral density from the side's first flattened color is determined and, if the side has a second flattened color, the side's second flattened color. The two atomic regions incident to the segment are trapped based upon the effective neutral densities for the respective sides.

The present disclosure relates to a system for confident daily make-up application comprising a makeup compact and a client device. The system may be applied to specific facial features or entire faces for a complete style. The client device is configured to provide an interactive user experience by displaying templated instructions for makeup application. Templated instructions provide a ‘paint-by-numbers’ approach to daily makeup application. The makeup compact further comprises a client device housing, wherein the client device can be docked for the duration of makeup application and coaching. The client device housing is separated from a protective cover by a semi-transparent display that can allow for tactile interaction with the client device. The semi-transparent display, therefore, in this orientation, serves as a back projection plane, wherein the template instruction from the client device is communicated to the user as it appears on the semi-transparent display.

The invention provides a classifiied data multi-view visual coloring method and system based on similar saliency. The method comprises the following steps: receiving classification data; projecting the classified data to a visual space, and obtaining position information of the classified data; measuring the separation degree between each class of data based on the position information, and calculating change information of the same class on different classification data based on similarity measurement; recombining the color palettes or randomly selecting a plurality of colors from the discretized color space as initial solutions, and searching an approximate optimal solution based on a simulated annealing algorithm by combining the separation degree and change information between classes to generate the color palettes; and rendering the classification data based on the optimal palette. The simulated annealing algorithm is adopted, the given palette can be rapidly redistributed or the palette can be directly generated, meanwhile, distribution in data and changes between the data are considered, color difference measurement is combined, the similar significance of the changed area is improved, the intra-class distinction degree is kept, and the efficiency of visual analysis is improved.

The invention belongs to the technical field of image recognition, and particularly relates to a text line character segmentation method and device based on projection. In the technical field of imagerecognition, a conventional optical character recognition technology needs to be improved urgently in recognition rate and accuracy. The invention provides the text line character segmentation methodand device based on projection. The method determines the actual width and height of a single character through horizontal projection and vertical projection, and the method is accurate in judgment of the upper and lower boundaries of the character and is high in robustness; through inclined font correction, the application range of character segmentation is expanded. Character projection data are subjected to weighted summation by adopting a gray image vertical projection curve, a binary image vertical projection curve and an edge intensity difference variance projection curve; the accuracyand reliability of character boundary judgment are improved, accurate and rapid character segmentation is facilitated, and segmentation of lightly adhered characters and adhered special characters isalso effective.

The invention discloses a pointer-shaped mouse capable of realizing writing on a projection screen. A speaker usually adopts a power point (PPT) displayed by a computer to make a presentation. A turner spread in the present market only can finish simple page turning action, but cannot realize positioning and selection functions like a computer mouse. Simultaneously, the speaker is often required to perform blackboard-writing, and even though conventional computer software such as OneNote supports handwriting input, how to directly perform electronic writing on the large projection screen is undoubtedly a problem to be solved. The pointer-shaped mouse capable of realizing writing on the projection screen can realize the mouse pointer positioning, menu selection and direct drawing and writing on the projection screen.

The embodiment of the invention discloses a three-dimensional image classification method and device, equipment and a computer readable storage medium. The method comprises the following steps: acquiring a three-dimensional image and a plurality of text tags; projecting the three-dimensional image to a plurality of visual angles to obtain a plurality of visual angle depth images; coding the depth images of the plurality of visual angles and the plurality of text labels respectively to obtain image features corresponding to the plurality of visual angles and a plurality of text features; and calculating similarity according to the image features corresponding to the plurality of visual angles and the plurality of text features to obtain first text similarity. By converting an object classification task into an image-text matching task, the method is not limited by a fixed text label set, and has generalization ability for objects and concepts which are not seen. The first text similarity represents the similarity between the category corresponding to the object in the three-dimensional image and the plurality of text labels, and the category of the object in the three-dimensional image is determined according to the first text similarity, so that the classification accuracy of the three-dimensional image is improved.

The invention belongs to the technical field of image recognition, and particularly relates to a text line rotation correction method and device based on projection. At present, common optical character recognition algorithms mostly adopt algorithms such as path search and connected domain analysis to directly perform character segmentation, are susceptible to noise interference, and are relatively high in error rate and relatively low in efficiency. The projection technology is adopted, the text line direction can be rapidly and accurately positioned and the rotation correction angle can be calculated according to the corresponding relation between the aspect ratio of the projection curve and the text line inclination angle so that a text line image in the horizontal direction can be acquired, and the projection method is efficient, accurate and great in stability. Through coarse positioning and fine positioning processes, the operation rate is improved, and the accuracy of the algorithm is improved; the method is easy to implement, low in algorithm complexity, universal and suitable for popularization and application in the industry.

The invention provides an automatic marking and typesetting method and device, and the method comprises the steps: obtaining 3D cabinet data at a cloud server; projecting the 3D cabinet body data froma plurality of view directions according to a preset rule to respectively obtain graphic information of the 3D cabinet body data in each view; collecting annotation information according to a presetrule; classifying the annotation information to obtain classified annotation information; sorting and layering the classified annotation information according to a preset relationship to obtain firstannotation information; respectively adding the first annotation information into the graphic information in each view to obtain annotated graphic information in each view; wherein the preset rule isa view display and/or occlusion rule, and the preset relationship comprises head-to-tail connection, nesting or interference, so that the accuracy of the design scheme data can be improved, the user image output time can be reduced, and the image output efficiency can be improved.