Canon Kabushiki Kaisha

Bin Liao

Cameron Murray Edwards

Farris Junius Halim

Ben Yip

Albert Chang

Scott Bradley

Ping Liu

Richard Ling

Eugene Robert Arena

A method for determining the distance from a tip of a pointer to a surface using a light source and a single camera, the method comprising detecting in an image captured by the camera a tip of the pointer, determining in the image captured by the camera the intensity of a set of pixels below the tip of the pointer, the intensity defining a reflection by the surface of the tip of the pointer illuminated by the light source, and determining the distance from the tip of the pointer to the surface depending upon the intensity of the set of pixels below the tip of the pointer and an intensity of pixels of the tip of the pointer in the image.

Touch system and method for determining the distance between a pointer and a surface

A method of compositing a plurality of graphic objects with a compositing buffer, is disclosed. The plurality of graphic objects forming a group is attenuated by group opacity and is composited from a top object to a bottom object. Based on a first mask and the group opacity, a second mask is generated. The first mask stores a remaining possible contribution for further graphic objects below and including the plurality of graphic objects. The plurality of graphic objects in a top down order is processed. In particular, for each graphic object of the plurality of graphic objects: (a) a contribution value for the graphic object using the second mask is determined, the contribution value representing a contribution of the graphic object to the compositing buffer; (b) a colour value of the graphic object is composited with the compositing buffer using the contribution value; and (c) the second mask is updated using the contribution value. The first mask is then updated using the second mask and the group opacity. The updated first mask is configured for further compositing of objects below the plurality of graphic objects.

Method of compositing variable alpha fills supporting group opacity

A change in field order between an input video frame and an output video frame or an input video frame being displaced by an odd number of scan-lines with respect to an output video frame, may introduce out of order fields in the output video frame. A method (), apparatus and computer program product for generating an interlaced video stream from one or more interlaced input video streams and graphical objects is disclosed. The method () enables input video streams to be transformed (e.g., scaled and translated) to generate an interlaced video stream. The method () ensure that the fields of an output video frame are in correct order by shifting a corresponding input video frame down by one scan-line.

Processing interlaced video in a frame based rendering system

A video node for use in rendering one or more video frames of a video stream. The video node is represented by a compositing tree (). The compositing tree () comprises at least one image primitive node () representing one or more video frames () of the video stream. At least one of the video frames () represented by the image primitive node () is composited with at least one further graphical primitive represented by at least one further primitive node () of the compositing tree (). The video frame () is composited with the further graphical primitive according to a compositing operation represented by an operation node of the compositing tree () in order to generate a composite image () represented by at least one composite node () of the compositing tree ().

Growing community of inventors

Beecroft, Australia

Bin Liao