Canon Kabushiki Kaisha

Kok Tjoan Lie

Timothy Merrick Long

Kevin John Moore

David Ian Johnston

Christopher Fraser

Zhi-Min Pan

Gregory Joseph Johnson

A method of compositing layers by grouping the layers into a foreground group and a background group; identifying independent instructions of compositing model for execution independently from the background group and dependent instructions requiring a compositing output of a background layer in order to composite foreground layers; executing the independent instructions on the foreground layers in parallel with compositing the background layers, a first independent instruction storing a corresponding result in a first buffer and a second independent instruction storing a corresponding result in a second buffer; executing a dependent instruction by updating the second buffer using the background compositing output; and determining a compositing output for the foreground group dependent upon contents of the first buffer and the updated second buffer.

Parallelising per-pixel compositing

Disclosed are methods, apparatus ( ) and computer readable media for rendering at least one graphic object ( ) described by at least one edge ( ) into a raster pixel image ( ) having a plurality of scan lines and a plurality of pixel locations on each scan line. For each scan line, coordinates of intersection of those edges of the objects that intersect the scan line are determined in a predetermined order. This is preferably achieved by processing edge records ( ) using a number of buffers ( ) thereby enabling efficient sorting of edge intersections into order. For each adjacent pair of edge intersections, information ( ) associated with the corresponding object is examined to determining a set of active objects ( ) for a span of pixel locations between the corresponding pair of edge intersections. For each span of pixel locations, the corresponding set of active objects is used to determine ( ) a value for each of the locations within the span. The information may include one or more of a fill count, a clip count and other factors. A compositing model accommodating opacity is also disclosed, as are stack operations used to facilitate rendering and other features which contribute to fast processing of image components.

Fast rendering techniques for rasterised graphic object based images

The apparatus for processing pixels of a digital image comprises an image processor ( ) for processing the pixels, wherein the image processor ( ) comprises a plurality of color output channels . The apparatus further comprises a controller ( ) for configuring the image processor ( ) to operate in a first color processing mode or a second color processing mode. The image processor ( ) during the first color processing mode, processes pixels each having one or more pixel color components and outputs therefrom one said pixel at a time by outputting said one or more pixel color components on corresponding color output channels ( ). The image processor ( ) during the second color processing mode, processes pixels each having one pixel color component and outputs therefrom one or more pixels at a time by outputting corresponding one pixel color components on corresponding color output channels ( ).

Processing pixels of a digital image

Disclosed is method and apparatus ( ) for improving the performance of a pipeline system in which a FIFO ( ) is incorporated in the pipeline between an upstream processing module ( ) and a downstream processing module ( ), each of the modules ( ) having access to a common external memory ( ), this being typical in many ASIC arrangements. The method commences with detecting when the FIFO ( ) is substantially full and transferring commands from the upstream module ( ) to the external memory ( ). Commands received by the downstream module ( ) from each of the FIFO ( ) and the external memory ( ) are interpreted to determine a source of following ones of the commands.

Growing community of inventors

South Hurstville, Australia

Kok Tjoan Lie