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Showing papers on "Alpha compositing published in 1999"


Proceedings ArticleDOI
01 Jul 1999
TL;DR: This paper introduces a new process, environment matting, which captures not just a foreground object and its traditional opacity matte from a real-world scene, but also a description of how that object refracts and reflects light, which is called an environment matte.
Abstract: This paper introduces a new process, environment matting, which captures not just a foreground object and its traditional opacity matte from a real-world scene, but also a description of how that object refracts and reflects light, which we call an environment matte The foreground object can then be placed in a new environment, using environment compositing, where it will refract and reflect light from that scene Objects captured in this way exhibit not only specular but glossy and translucent effects, as well as selective attenuation and scattering of light according to wavelength Moreover, the environment compositing process, which can be performed largely with texture mapping operations, is fast enough to run at interactive speeds on a desktop PC We compare our results to photos of the same objects in real scenes Applications of this work include the relighting of objects for virtual and augmented reality, more realistic 3D clip art, and interactive lighting design CR Categories: I210 [Artificial Intelligence]: Vision and Scene Understanding – modeling and recovery of physical attributes; I33 [Computer Graphics]: Picture/Image Generation – display algorithms; I37 [Computer Graphics]: ThreeDimensional Graphics and Realism – color, shading, shadowing, and texture Additional

254 citations


Patent
05 Mar 1999
TL;DR: In this paper, a plurality of input graphics images are iteratively blended in real time to provide a blended graphics image, which is then composited with other layers such as an input video image.
Abstract: A method, apparatus, system and machine-readable medium for generating a composite output image based upon multiple input images. In certain embodiments, a plurality of input graphics images are iteratively blended in real time to provide a blended graphics image, which is then composited with other layers such as an input video image. The composite output image may then be provided to a display device. Iterative blending of the plurality of graphics images may include scaling, format conversion, and color space conversion, and may be performed based on priority information received for the graphics images from content sources. Compositing may include an alpha blending based on alpha values for pixels of the images.

61 citations


Patent
Keiho Akiyama1, Kou Otokozawa1, Shigehiro Fukase1, Naoto Baba1, Yoshihiro Naitou1, Tohru Baba1 
26 Aug 1999
TL;DR: In this article, an image compositing apparatus capable of producing a natural composite image, with a simple structure and a less occupying space, is presented. But it is not suitable for the task of image generation.
Abstract: The present invention provides an image compositing apparatus capable of producing a natural composite image, with a simple structure and a less occupying space. The present invention also provides a method for compositing an image by providing shadow-free conditions in a limited space for chroma-keying so that a subject image and a desired background image are naturally integrated as one image.

42 citations


Patent
George Politis1
01 Sep 1999
TL;DR: In this article, a method of creating an image is disclosed, which is formed by rendering and compositing at least a plurality of graphical objects whereby each of the objects has a predetermined outline.
Abstract: A method of creating an image is disclosed. The image is formed by rendering and compositing at least a plurality of graphical objects whereby each of the objects has a predetermined outline. The method comprises the following steps. Firstly, dividing a space in which the outlines are defined into a plurality of regions whereby each of the regions is defined by at least one region outline. The region outline substantially follows at least one of the predetermined outlines or parts thereof and is substantially formed by segments of a virtual grid encompassing the space. Secondly, manipulating the regions to determine a plurality of further regions whereby each of the further regions has a corresponding compositing expression. Fourthly, classifying the further regions according to at least one attribute of the graphical objects within the further regions. Fifthly, modifying each of the corresponding compositing expressions according to a classification of each of the further regions to form an augmented compositing expression for each of the further regions. Finally, compositing the image using each of the augmented compositing expression.

16 citations


Patent
08 Apr 1999
TL;DR: In this paper, a method for fulfilling a multi-window and a multiple alpha blending in a digital television set is provided to fulfill multiview display without using a background plane, thereby reducing a memory usage.
Abstract: PURPOSE: A method for fulfilling a multi-window and a multiple alpha blending in a digital television set is provided to fulfill multi-window display without using a background plane, thereby reducing a memory usage. CONSTITUTION: A method for fulfilling a multi-window and a multiple alpha blending in a digital television set includes following steps. At first, a main video window screen is processed to be displayed as a full screen when main video window data input from a format converter is present. Sub video data is overlapped in a window priority order and the result is displayed as a multiple window on the main video window screen when the plurality of sub video window data are input from the video frame buffer as well as the main video window data. The graphic window data input from the graphic frame buffer is mixed with the window-processed video window screen according to an alpha value which is predetermined in the graphic frame buffer, and the result is displayed on the television set.

1 citations


Patent
05 Apr 1999
TL;DR: In this paper, the problem of image compositing using only one graphics processing section is solved by generating a graphics image signal or a signal on which graphics image information is superimposed and composites the signal with a video signal independently of whether the video signal selected among a plurality of video signals is an analog signal or digital signal.
Abstract: PROBLEM TO BE SOLVED: To obtain an image compositing device that uses only one graphics processing section so as to generate a graphics image signal or a signal on which graphics image information is superimposed and composites the signal with a video signal independently of whether the video signal selected among a plurality of video signals is an analog signal or a digital signal. SOLUTION: A graphics processing section 1 that receives a digital broadcast reception video image to composite graphics images, generates a graphics image of an analog broadcast reception video image, generates a switching signal to composite the graphics images, allows a multiplexer 7 to composite the images by using the switching signal to obtain the video signal resulting from compositing the graphics image onto the analog broadcast reception video image. Furthermore, the graphics image information is superimposed for an invalid display period of the video signal to select the composite of the graphics images.

1 citations


Patent
23 Dec 1999
TL;DR: In this article, a method of defining and rendering an image comprising a plurality of components (bitmaps, vector-based elements, text and effects or other effects) and an alpha channel is presented.
Abstract: The invention provides a method of defining and rendering an image comprising a plurality of components (bitmaps, vector-based elements, text and effects or other effects) and an alpha channel. The components are grouped into a ranked hierarchy based on their position relative to each other. There can be groups of groups. With this grouping, each component can be defined using a common protocol and rendering and processing of the components can be dealt with in the same manner. The image can be processed on a scanline-by-scanline basis. For each scanline analysis, information regarding neighboring scanlines are acquired and processed, as needed.

1 citations