Synchronizing video outputs towards a single display frequency

A technology of video output and display frequency, applied in the direction of digital output to display equipment, input/output process of data processing, TV, etc.

Active Publication Date: 2019-10-11
CAE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, synchronizing signals from different sources often requires complex solutions mainly based on dedicated hardware components

Method used

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  • Synchronizing video outputs towards a single display frequency
  • Synchronizing video outputs towards a single display frequency
  • Synchronizing video outputs towards a single display frequency

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Embodiment Construction

[0021] The development of different embodiments of the present invention was motivated by the requirement that images from different sources must be displayed simultaneously on a single screen or using a single display panel in the context of immersive interactive computer simulations. Some devices may require multiple video inputs and offer options such as merging / adding them together, which may also require synchronizing different inputs. More specifically, in the context of immersive interactive computer simulations, one or more trainees are presented with a large screen (single screen) display system in an interactive simulation station.

[0022] In the context of immersive interactive computer simulations, the images to be displayed on the display system are usually also computed using separate computers each equipped with one or more hardware video cards. To avoid visual artifacts, the output of the video card needs to be synchronized. One solution is to influence the t...

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Abstract

Synchronizing video outputs towards a single display frequency. A method and a system for synchronizing video output towards a single display frequency comprises providing a shared reference signal for synchronizing, at the single display frequency, video output between two or more image generator processors each driving at least one independent video card. Each of the video cards supports on-the-fly image refresh rate adaptation based on responsiveness from the corresponding image generator processor. The method also comprises, at each one of the image generator processors, artificially affecting, in real-time, image generation rendering speed during a next frame generation processing to trigger the on-the-fly image refresh rate adaptation by the one image generator processor's video cardfor proactively scheduling refresh of an image corresponding to the next frame by the one image generator processor's video card, thereby aligning the refresh of the image to the shared reference signal while avoiding manipulation of video card's memory registers by the one image generator processor.

Description

technical field [0001] The present invention relates to output synchronization of video cards, and more particularly, to a software-controlled output synchronization of video cards. Background technique [0002] Sometimes it is necessary to display images from different sources simultaneously. For example, synchronizing projectors avoids visual artifacts when projecting images from different projectors on a single screen. Likewise, different signals fed to a single projector or display are synchronized to display correctly together. However, synchronizing signals from different sources often requires complex solutions based mainly on dedicated hardware components. [0003] The invention aims to simplify the synchronization of images from different sources. Contents of the invention [0004] The purpose of this section is to briefly introduce some concepts that will be further described in the "Detailed Examples" section below. This section is not intended to identify k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/14
CPCH04N21/242H04N5/06G06F3/1454G06F3/1438G06F3/1446G09G2340/0435G09G5/12G09G5/18G09G2360/06G09G2300/026H04N5/067
Inventor S·贝鲁布J-S·迪翁
Owner CAE INC
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