scispace - formally typeset

Topic

Alpha compositing

About: Alpha compositing is a(n) research topic. Over the lifetime, 482 publication(s) have been published within this topic receiving 11035 citation(s). The topic is also known as: alpha blend & alpha channel.


Papers
More filters
Proceedings ArticleDOI
01 Jan 1984
Abstract: Most computer graphics pictures have been computed all at once, so that the rendering program takes care of all computations relating to the overlap of objects. There are several applications, however, where elements must be rendered separately, relying on compositing techniques for the anti-aliased accumulation of the full image. This paper presents the case for four-channel pictures, demonstrating that a matte component can be computed similarly to the color channels. The paper discusses guidelines for the generation of elements and the arithmetic for their arbitrary compositing.

1,310 citations

Book
01 Dec 1988
TL;DR: The case for four-channel pictures is presented, demonstrating that a matte component can be computed similarly to the color channels, and guidelines for the generation of elements and the arithmetic for their arbitrary compositing are discussed.
Abstract: Most computer graphics pictures have been computed all at once, so that the rendering program takes care of all computations relating to the overlap of objects. There are several applications, however, where elements must be rendered separately, relying on compositing techniques for the anti-aliased accumulation of the full image. This paper presents the case for four-channel pictures, demonstrating that a matte component can be computed similarly to the color channels. The paper discusses guidelines for the generation of elements and the arithmetic for their arbitrary compositing.

1,210 citations

Patent
08 Oct 1993
Abstract: A central processing unit (CPU) is provided and is coupled to a display for displaying graphic and other data in multiple overlapping windows. The CPU is further coupled to one or more input devices which permits a user to selectively position a cursor and input and manipulate data within each of the windows on the display. The windows include defined areas having window features such as text, icons and buttons corresponding to functions to be executed by the CPU. Multiple applications may be executed concurrently by the CPU such that each application is associated with one or more windows. Each display element (“pixel”) comprising the display is represented by multiple bits in a computer frame buffer memory coupled to the CPU. An alpha value (α) is associated with the intensity of each pixel of the display, such that multiple images may be blended in accordance with a predefined formula utilizing the alpha values. By setting the alpha values appropriately, transparency may be accomplished such that data associated with underlying windows may be rendered visible to the user. Effectively, the present invention merges multiple images through alpha “blending” such that several images appear transparently on top of one another. The present invention, through the selective use of alpha blending, permits underlying windows to display data visible to the user through windows which are overlaid above an underlying window.

544 citations

Patent
30 Aug 1996
Abstract: An electronic imaging system useful for compositing images includes an electronic camera for capturing multiple images, including a first image of a subject plus background and a second image of the background only. The first and second images are subtracted to generate a difference image, and the difference image is processed to generate a mask image. The mask image is then applied to the first image to select an area in which the subject is located, whereby the selected subject area is used in the compositing of a new image.

241 citations

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

241 citations

Network Information
Related Topics (5)
Rendering (computer graphics)

41.3K papers, 776.5K citations

77% related
Mobile device

58.6K papers, 942.8K citations

72% related
Mobile computing

51.3K papers, 1M citations

71% related
User interface

85.4K papers, 1.7M citations

70% related
Feature (computer vision)

128.2K papers, 1.7M citations

70% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
20219
20208
201913
201821
201723