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.

Construction method, inspection method, and program for image data with label, and construction device and inspection device for image data with label

Abstract: An alpha channel is added in addition to multiple channels forming an image of an item. A second pixel value differing from a first pixel value, which is assigned to a defect-free region, is assigned to a region corresponding to a defect region in the alpha channel. The image including the alpha channel is divided into multiple image segments. A defect label is assigned to the image segment in which the second pixel value is included in the alpha channel, and a non-defect label is assigned to the image segment, in which the second pixel value is not included in the alpha channel. The alpha channel is removed from the image segments to generate labeled image segment data.

Treating semi-transparent features in the conversion of three-dimensional images to two-dimensional images

Abstract: A two dimensional image which has a semitransparent object in the foreground of the image has three contributions to the final color shown in a pixel where the semitransparent object is present. Properties of a semitransparent object and background in the given two dimensional image are processed to determine the contribution of the background color of the image, the foreground color of the object, and the alpha channel of the object. Once these properties are determined, the accurate stereoscopic rendering of the semitransparent object in front of the background allows the two dimensional image to be converted to three dimensions.

Image processing apparatus and superimposed image generation method

Abstract: During a period in which it is necessary to display two or more images in a superimposed manner, an image generation block of an information processing apparatus supplies the data of the image concerned to a superimposition processing block. A first image acquisition block and a second image acquisition block of the superimposition processing block acquire a first image and a second image, respectively, to be displayed in a superimposed manner. A luminance range adjustment block adjusts at least one luminance range as required with amount of adjustment corresponding to an alpha (α) value set to the second image. An output value computation block executes the computation of alpha blending by use of the image after adjustment so as to determine the pixel value of a display image, thereby outputting the determined pixel value to an image output block.

Method for accessing and rendering an image

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.

Alpha blending based on a look-up table

Abstract: The present invention provides an approach for generating a blended image from plural image layers in accordance with at least one α-layer being assigned to one of the plural image layers. In accordance with the α-layer, a transparency of image areas of the assigned image layer is indicated. The α-layer includes a pointer associated with an image area of the assigned image layer. A memory stores a transparency table including a plurality of transparency values at particular memory addresses. The pointer refers to an address of the memory storing the transparency table in order to assign a transparency value to the image area.