Automated measurement of differential latency between displays

• Main Authors: CANDRY PATRICK C, LEEMAN MARC
• Format: Patent
• Language: English
• Published: 26.08.2015
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CALCULATING; COMPUTING; COUNTING; CRYPTOGRAPHY; DISPLAY; DISPLAYING; EDUCATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; LABELS OR NAME-PLATES; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SEALS; SIGNS

The present invention relates to methods or system for the measurement of differential latency between displays located at endpoints of network, displays being driven by one or more rendering machines and having means for refreshing the images on different displays at the same point in time as well as means adapted so that the content of each displayed image can only change after the completion of previous displayed frame. For example the displays can be frame locked and have double buffered swap locked memory operation. The method or system is adapted to stream test images over the network to the displays of the different endpoints. The test images are displayed on the displays. The displayed images at the different endpoints are recorded by an image recording device such as a camera. Optionally the delays can be compensated, e.g. by delaying the streams with lower latency at the level of the frame buffer (FIFO) before or after decoding. Preferably the system or method is adapted to measure end-to-end differential latency between the displays and for putting this in vector form.