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Alpha compositing

About: Alpha compositing is a research topic. Over the lifetime, 482 publications have been published within this topic receiving 11035 citations. The topic is also known as: alpha blend & alpha channel.


Papers
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Book ChapterDOI
31 Oct 2018
TL;DR: In this article, the authors describe the volumetric transparency method for rendering transparent objects that departs from classic alpha blending, and discuss per-pixel lists of surface fragments and evaluates illumination analytically between neighboring pairs.
Abstract: This chapter describes the volumetric transparency method for rendering transparent objects that departs from classic alpha blending. It discusses per-pixel lists of surface fragments and evaluates illumination analytically between neighboring pairs. The chapter discusses an algorithm for the case when the transparent objects are spheres. It suggests that executing a single iteration step of the intersection algorithm is sufficient to provide the required detail. The pixel shader traces linked lists reading fragments into a local array and sorts them according to their distance. The chapter shows how the approach can be extended to volumetric transparency, and even intersecting objects. Thus, volumetric transparency can be seen both as a relatively low-cost improvement to order-independent transparency and as a sophisticated approach to replace billboards in particle rendering. Thus, the method is geared at the most prevalent application of transparency: particle system rendering, where it avoids all popping and clipping artifacts characteristic of alpha-blended billboard clouds.

1 citations

Patent
24 Apr 2007
TL;DR: In this article, a real-time multilayer image synthesis recording system and method, and a recording medium using the system and methods are disclosed, which comprises an image synthesizing unit which synthesizes a chromachannel, background separation image, with a motion image, and further synthesizes with a realtime alpha channel which reacts with sound for thereby generating a 3D multi-layer motion image and converting into video and audio files.
Abstract: Real-time multilayer image synthesis recording system and method, and a recording medium using the system and method are disclosed. The system comprises an image synthesizing unit which synthesizes a chromachannel, background separation image, with a motion image, and further synthesizes with a real-time alpha channel which reacts with sound for thereby generating a 3D multilayer motion image and converting into video and audio files, and a recording unit which stores the video and audio files and a control program into a storing medium in real time, with the control program being able to selectively control the video and audio files.

1 citations

Proceedings ArticleDOI
24 Jul 2016
TL;DR: A new storage scheme for computer graphic images based on OpenEXR 2.0 is presented, which avoids going back and forth between the rendering and the compositing departments because no mask image or layering are needed anymore.
Abstract: We present a new storage scheme for computer graphic images based on OpenEXR 2. Using such EXR/Id files, the compositing artist can isolate an object selection (by picking them or using a regular expression to match their names) and color corrects them with no edge artefact, which was not possible to achieve without rendering the object selection on its own layer. Using this file format avoids going back and forth between the rendering and the compositing departments because no mask image or layering are needed anymore. The technique is demonstrated in an open source software suite, including a library to read and write the EXR/Id files and an OpenFX plug-in which generates the images in any compositing software.

1 citations

Posted Content
TL;DR: Zhang et al. as discussed by the authors extracted image foregrounds from both source and multiple target images and extracted the semantic information such as faces, lips, teeth, eyes, eyebrows, etc., from the extracted foregrounds of the source image.
Abstract: We present a novel approach of color transfer between images by exploring their high-level semantic information. First, we set up a database which consists of the collection of downloaded images from the internet, which are segmented automatically by using matting techniques. We then, extract image foregrounds from both source and multiple target images. Then by using image matting algorithms, the system extracts the semantic information such as faces, lips, teeth, eyes, eyebrows, etc., from the extracted foregrounds of the source image. And, then the color is transferred between corresponding parts with the same semantic information. Next we get the color transferred result by seamlessly compositing different parts together using alpha blending. In the final step, we present an efficient method of color consistency to optimize the color of a collection of images showing the common scene. The main advantage of our method over existing techniques is that it does not need face matching, as one could use more than one target images. It is not restricted to head shot images as we can also change the color style in the wild. Moreover, our algorithm does not require to choose the same color style, same pose and image size between source and target images. Our algorithm is not restricted to one-to-one image color transfer and can make use of more than one target images to transfer the color in different parts in the source image. Comparing with other approaches, our algorithm is much better in color blending in the input data.

1 citations

Patent
Duan Zhigang, Cao Fang, Li Xuelei, Zhang Xin, Wang Li 
22 Dec 2017
TL;DR: In this paper, an Alpha channel color palette generation method and system during a process of WebP image compression and a host terminal and the Alpha color channel color channel generation method is applied to the host terminal.
Abstract: The invention discloses an Alpha channel color palette generation method and system during a process of WebP image compression and a host terminal and the Alpha color channel color palette generation method is applied to the host terminal. The Alpha channel color palette generation method comprises steps of obtaining a pixel intensity value of the Alpha channel of the Webp image, performing processing on the pixel intensity value to obtain image data to be generated, transmitting the image data to be generated to an FPGA device terminal and calling a core function of an FPGA device terminal in order to make the FPGA device terminal perform parallel processing on the image data to be generated to obtain a color palette generation result, and obtaining the color palette generation result. The Alpha channel color palette generation method and system during the process of WebP image compression and the host terminal call the core function through the host terminal, make the image data to be generated which is obtained through processing the pixel intensity value of the Alpha channel realize parallel processing on the FPGA device terminal, obtain the color palette generation result after the parallel processing from the FPGA device, accelerate the generation of the Alpha channel color palette and improve image compression speed.

1 citations


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