Patent ID: 9232156
Filing Date: 2016-01-05
CPC Classification: G06T,H04N

Claim Text:
1. A video processing device for generating an output video stream on the basis of two or more concurrent input video streams, wherein each of the input video streams comprises a sequence of input images, the output video stream comprises a sequence of output images, and the video processing device is arranged to generate each of said output images by merging a respective set of input images, wherein the set of input images comprises one input image from each of said input video streams and wherein the video processing device is arranged to merge the set of input images in a series of two or more merging rounds, wherein each merging round comprises: forming an output tile by merging a set of input tiles, wherein the set of input tiles comprises one input tile from each input image of the respective set of input images, and writing the output tile to an output memory unit, wherein the output tiles written to the output memory unit in said series of merging rounds represent the output image; wherein the video processing device comprises a tile buffer and a processing unit and is arranged to merge the set of input tiles by: providing at least a part of input tile data in the tile buffer, the input tile data representing the set of input tiles; and operating the processing unit to retrieve input tile data from the tile buffer required for computing at least a part of the output tile and to compute the output tile on the basis of the retrieved input tile data; and wherein the processing unit is arranged to stop computing the output tile in response to detecting that required input tile data is not present in the tile buffer and to resume computing the output tile in response to retrieving the required input tile data from the tile buffer.