Calibrating method for calibrating measured distance of a measured object measured by a distance-measuring device according to ambient temperature and related device
First Claim
Patent Images
1. A distance-measuring device, comprising:
- a lighting component, emitting a detecting light to a measured object to generate a reflective light;
a first lens, disposed in a transmission path of the reflective light;
an image sensor, the reflective light being focused by the first lens onto the image sensor for the measured object to form an image at a first imaging location,a distance-calculating circuit calculating a measured distance between the distance-measuring device and the measured object according to the first imaging location, a focal length of the first lens, and a first predetermined distance between the lighting component and the image sensor;
a temperature sensor for measuring the ambient temperature of the distance-measuring device;
a temperature compensation calculating circuit for calculating a first calibrated imaging location according to the ambient temperature and the first imaging location, and providing the first calibrated imaging location to the distance-calculating circuit for calibrating the measured distance; and
a parameter-calculating circuit utilized for providing a first calibrating parameter and a second calibrating parameter to the distance-measuring circuit;
the first calibrating parameter is utilized for calibrating a first sensing-error angle and a second sensing-error angle of the image sensor;
the second calibrating parameter is utilized for calibrating a lighting-error angle rotated by the detecting light emitted by the lighting component;
wherein the distance-calculating circuit calculates the calibrated measured distance according to the following formula;
DM=1/[A×
DCS—
CAB+B];
wherein DM represents the calibrated measured distance;
A and B respectively represent the first calibrating parameter and the second calibrating parameter; and
DCS—
CAB represents the first calibrated imaging location;
wherein a relationship among the first calibrating parameter, the first sensing-error angle, and the second sensing-error angle is represented by the following formula;
A=(cos θ
CS2×
cos θ
CS1)/(DF×
L);
wherein θ
CS1 represents the first sensing-error angle θ
CS2 represents the second sensing-error angle; and
L represents the first predetermined distance between the lighting component and the image sensor;
wherein a relationship between the second calibrating parameter and the lighting-error angle is represented by the following formula;
B=tan θ
LD/L;
wherein θ
LD represents the lighting-error angle.
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Abstract
A calibrating method of calibrating a measured distance of a measured object measured by a distance-measuring device according to an ambient temperature includes providing a temperature sensor for measuring the ambient temperature of the distance-measuring device, calculating a calibrated imaging location of the measured object according to the ambient temperature and an imaging location of the measured object, and calibrating the measured distance according to the calibrated imaging location. In this way, when the distance-measuring device measures the measured object, the error due to the variation of the ambient temperature is avoided according to the calibrating method.
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Citations
13 Claims
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1. A distance-measuring device, comprising:
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a lighting component, emitting a detecting light to a measured object to generate a reflective light; a first lens, disposed in a transmission path of the reflective light; an image sensor, the reflective light being focused by the first lens onto the image sensor for the measured object to form an image at a first imaging location, a distance-calculating circuit calculating a measured distance between the distance-measuring device and the measured object according to the first imaging location, a focal length of the first lens, and a first predetermined distance between the lighting component and the image sensor; a temperature sensor for measuring the ambient temperature of the distance-measuring device; a temperature compensation calculating circuit for calculating a first calibrated imaging location according to the ambient temperature and the first imaging location, and providing the first calibrated imaging location to the distance-calculating circuit for calibrating the measured distance; and a parameter-calculating circuit utilized for providing a first calibrating parameter and a second calibrating parameter to the distance-measuring circuit;
the first calibrating parameter is utilized for calibrating a first sensing-error angle and a second sensing-error angle of the image sensor;
the second calibrating parameter is utilized for calibrating a lighting-error angle rotated by the detecting light emitted by the lighting component;wherein the distance-calculating circuit calculates the calibrated measured distance according to the following formula;
DM=1/[A×
DCS— CAB+B];
wherein DM represents the calibrated measured distance;
A and B respectively represent the first calibrating parameter and the second calibrating parameter; and
DCS— CAB represents the first calibrated imaging location;wherein a relationship among the first calibrating parameter, the first sensing-error angle, and the second sensing-error angle is represented by the following formula;
A=(cos θ
CS2×
cos θ
CS1)/(DF×
L);wherein θ
CS1 represents the first sensing-error angle θ
CS2 represents the second sensing-error angle; and
L represents the first predetermined distance between the lighting component and the image sensor;wherein a relationship between the second calibrating parameter and the lighting-error angle is represented by the following formula;
B=tan θ
LD/L;
wherein θ
LD represents the lighting-error angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification