Time-difference ranging system and method for improving accuracy, motion detection efficiency, and power saving

Abstract

The invention discloses a time-difference ranging system and method that can improve measurement accuracy. The method uses a light source to emit invisible light toward an object; the invisible light is reflected by the object to generate reflected light, which is received by a sensor; Connected to the sensor, used to record the time interval of the invisible light being emitted from the light source to the object and reflected by the object to reach the sensor. Then the processor estimates the measurement distance of the object according to the time interval, and adjusts the emission period of the light source, the exposure period of the sensor, the emission intensity of the invisible light and / or the key sensing range of the sensor according to the measurement distance .

Description

technical field [0001] The present invention relates to a time-difference distance measurement system and its method, especially a time-difference distance measurement that improves measurement accuracy, saves power, and / or improves motion detection efficiency based on the time between detection light and the object to be measured. systems and methods. Background technique [0002] In the prior art, a time of flight (TOF) system emits detection light from an object to be tested and receives reflected light generated by reflecting the detection light from the object to be measured. The time-of-flight ranging system can calculate the distance between the time-of-flight ranging system and the object to be measured by measuring the time required for the detection light to go back and forth between the distance measuring device and the object to be measured. However, the time-of-flight ranging system in the prior art does not dynamically adjust the distance detection range of th...

AI Technical Summary

Problems solved by technology

However, the time-of-flight ranging system in the prior art does not dynamically adjust the distance detection range of the time-of-flight ranging system due to the distance of the object to be measured, nor does it dynamically adjust the exposure time of the sensors in the ranging system, so the range The measurement accuracy is low

In addition, the time-of-flight ranging system in the prior art does not dynamically adjust the intensity of the projected light source due to the distance of the object to be measured, so it consumes more power

In addition to the above-mentioned shortcomings, the time difference distance measurement system of the prior art will not dynamically adjust the key sensing range of the sensor in the distance measurement system due to the distance of the object to be measured, so the sensor needs to sense a larger range, resulting in movement The detection rate (motion detection rate) is low

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