Latency measurement system and method
First Claim
1. A latency measurement system, the system comprising:
- an event generation device that generates an event used to measure system latency;
a component test system that receives the event and in response outputs a test component output signal and changes a state of a zero-latency indicator to produce a visual output representing receipt of the event;
a receiving system that receives the test component output signal and outputs a corresponding visible element;
a camera that generates a series of recorded images, where each recorded image contains an image of the zero-latency indicator and an image of the visible element; and
a processor that determines the system latency by determining a time difference in the series of recorded images between a representation of an occurrence of the change of state of the zero-latency indicator in the image and a representation of the occurrence of the event in the image of the visible element.
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Abstract
The present disclosure is directed to a system for, and method operating latency measurement including an event generation device that generates an initial event used to measure system latency. A component test system receives the event and in response outputs a test component output signal and a zero-latency indicator. An electronics system including a multifunction display unit receives the test component output signal and displays a visible element on the multifunction display unit. A camera generates a series of recorded images, where each recorded image contains an image of the zero-latency indicator and an image of the visible element. A processor then determines the system latency by determining a time difference in the series of recorded images between a representation of an occurrence of the event in the image of the zero-latency indicator and a representation of the occurrence of the event in the image of the visible element.
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Citations
20 Claims
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1. A latency measurement system, the system comprising:
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an event generation device that generates an event used to measure system latency; a component test system that receives the event and in response outputs a test component output signal and changes a state of a zero-latency indicator to produce a visual output representing receipt of the event; a receiving system that receives the test component output signal and outputs a corresponding visible element; a camera that generates a series of recorded images, where each recorded image contains an image of the zero-latency indicator and an image of the visible element; and a processor that determines the system latency by determining a time difference in the series of recorded images between a representation of an occurrence of the change of state of the zero-latency indicator in the image and a representation of the occurrence of the event in the image of the visible element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of measuring latency, the method comprising:
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triggering an event that generates an indication of the event and changes a state of a zero-latency indicator at substantially the same time to produce a visual output representing receipt of the event; recording a series of images with a camera, where each image contains both a representation of the zero-latency indicator and a representation of the indication of the event; and processing, by a computing device, the series of images to compute a latency value based on determining a time difference between the indication of the event and the change of state of the zero-latency indicator. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for measuring latency in electronic equipment, comprising:
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generating pulsed source signals at a sensor aperture and at a multi-functional display; capturing a source illumination and multi-functional display illumination directly and through a sensor path using a high frame rate camera; isolating a plurality of regions of interest for the source illumination and the multi-functional display illumination in video captured by the high frame rate camera; detecting peak thresholds in the regions of interest; creating a plurality of binary waveforms based on the detected peak thresholds; detecting a plurality of edges of the binary waveform measuring one of rising or falling; and measuring a delta time between the source and the multi-functional display edges providing a latency measurement. - View Dependent Claims (20)
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Specification