Measuring latency in a test system using captured images
First Claim
1. A latency measurement system, the system comprising:
- an event generation device that generates an event used to measure latency;
a hardware test component for controlling a vehicle, wherein the test component is configured to receive the event and in response output a test component output signal;
a zero-latency indicator configured to output a visual indication of the event, wherein the zero-latency indicator and the test component receive the event from the event generation device at substantially the same time;
an electronics system including a multifunction display device, where the electronics system receives the test component output signal and, in response, displays an image on the multifunction display device;
a camera that generates a series of recorded images, where each recorded image contains the zero-latency indicator and the image displayed by the multifunction display device; and
a processor that determines a latency of the test component by determining a time difference in the series of recorded images between a representation of an occurrence of the event as indicated by the zero-latency indicator and a representation of the occurrence of the event as indicated by the image of the multifunction display device.
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Abstract
A latency measurement system includes 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
19 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 latency; a hardware test component for controlling a vehicle, wherein the test component is configured to receive the event and in response output a test component output signal; a zero-latency indicator configured to output a visual indication of the event, wherein the zero-latency indicator and the test component receive the event from the event generation device at substantially the same time; an electronics system including a multifunction display device, where the electronics system receives the test component output signal and, in response, displays an image on the multifunction display device; a camera that generates a series of recorded images, where each recorded image contains the zero-latency indicator and the image displayed by the multifunction display device; and a processor that determines a latency of the test component by determining a time difference in the series of recorded images between a representation of an occurrence of the event as indicated by the zero-latency indicator and a representation of the occurrence of the event as indicated by the image of the multifunction display device. - 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 at both a hardware test component for controlling a vehicle and a zero-latency indicator at substantially the same time; sending the indication of the event from the test component to a multi-function display device which displays an image in response to the indication of the event; recording a series of images with a camera, where each image contains both the zero-latency indicator and the image displayed by the multi-function display device; and processing, by a computing device, the series of images to compute a latency value of the test component based on determining a time difference between the indication of the event by the zero-latency indicator and the multi-function display device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. 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 one of the plurality of binary waveforms by measuring one of rising or falling edges; and measuring a delta time between the generated pulsed source signals and the plurality of edges providing a latency measurement. - View Dependent Claims (19)
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Specification