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.

Methods and systems for per pixel alpha-blending of a parent window and a portion of a background image

Abstract: A system for alpha blending at least a portion of an image of a window with a background image, where the image of the window is captured by an alpha blender and blended together with an image of the background also captured by the alpha blender. The resulting alpha-blended image is then displayed within the window to give at least a portion of the window the appearance of smooth, anti-aliased edges.

Visibility-based blending for real-time applications

Abstract: There are many situations in which virtual objects are presented half-transparently on a background in real time applications. In such cases, we often want to show the object with constant visibility. However, using the conventional alpha blending, visibility of a blended object substantially varies depending on colors, textures, and structures of the background scene. To overcome this problem, we present a framework for blending images based on a subjective metric of visibility. In our method, a blending parameter is locally and adaptively optimized so that visibility of each location achieves the targeted level. To predict visibility of an object blended by an arbitrary parameter, we utilize one of the error visibility metrics that have been developed for image quality assessment. In this study, we demonstrated that the metric we used can linearly predict visibility of a blended pattern on various texture images, and showed that the proposed blending methods can work in practical situations assuming augmented reality.

System and method for synthesizing images

Abstract: An image synthesizing system is provided that can prevent image deterioration resulting from synthesis applied to a predictive image to be used for the next frame The image synthesizing system decodes and synthesizes a main frame and a sub-image compressed in different modes The image synthesizing system includes a main image frame buffer 122 , an alpha blending section 133 , and an image synthesis and display 140 The main image frame buffer 122 stores a main image to be referred to in the next frame decoding process The alpha blending section 133 alpha-blends a main image from the main image frame buffer with a decoded sub-image to produce a translucent composite image The image synthesis and display 140 superimposes the translucent composite image on the main image

Digital image compositing using a programmable graphics processor

Abstract: Digital Image compositing using a programmable graphics processor is described. The programmable graphics processor supports high-precision data formats and can be programmed to complete a plurality of compositing operations in a single pass through a fragment processing pipeline within the programmable graphics processor. Source images for one or more compositing operations are stored in graphics memory, and a resulting composited image is output or stored in graphics memory. More-complex compositing operations, such as blur, warping, morphing, and the like, can be completed in multiple passes through the fragment processing pipeline. A composited image produced during a pass through the fragment processing pipeline is stored in graphics memory and is available as a source image for a subsequent pass.

Method and apparatus for compositing image

Abstract: PROBLEM TO BE SOLVED: To provide a method and an apparatus for compositing an image capable of preventing the occurrence of discontinuity in one image as much as possible, in compositing images obtained from an imaging device having a wide dynamic range. SOLUTION: A high-sensitivity image 202 and a low-sensitivity image 201 which have little deviation in time and space are obtained by using a solid-state imaging device in which each light-receiving cell is separated into a high-sensitivity light-receiving region and a low-sensitivity light-receiving region, and an image quality degradation region such as bright area gradation or black area gradation deterioration is automatically discriminated from any one of these two images. A corresponding region is cut out from the other image according to the information of the image degradation regions 212A, 212B, and the cut-out image portions 231A, 231B are composited with the portions of the regions 212A, 212B. After that, low-pass filter processing is applied to the whole of a composite image or to the vicinity region of a composition boundary to smoothly composite the images, and then contour enhancement processing is applied. COPYRIGHT: (C)2004,JPO