In-vehicle camera device, monitoring system and method for estimating moving speed of vehicle
First Claim
Patent Images
1. A method for estimating a moving speed of a vehicle, comprising:
- sequentially capturing, by an image capturing unit, a first driving vehicle image and a second driving vehicle image, wherein the first driving vehicle image and the second driving vehicle image have a time difference therebetween;
performing image analysis on the first driving vehicle image to obtain a first pixel area and a first inclination of a first license plate image;
performing image analysis on the second driving vehicle image to obtain a second pixel area and a second inclination of a second license plate image; and
estimating the moving speed according to the first pixel area, the first inclination, the second pixel area, the second inclination and the time difference, comprising;
converting the first pixel area to a corresponding first relative distance;
converting the second pixel area to a corresponding second relative distance;
calculating a moving distance of the vehicle according to the first relative distance, the second relative distance, the first inclination and the second inclination; and
estimating the moving speed according to the moving distance and the time difference.
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Abstract
A method for estimating a moving speed of a vehicle includes: sequentially capturing, by an image capturing unit, a first driving vehicle image and a second driving vehicle image having a time difference; performing image analysis on the first driving vehicle image to obtain a first pixel area and a first inclination of a first license plate image; performing image analysis on the second driving vehicle image to obtain a second pixel area and a second inclination of a second license plate image; and estimating the moving speed according to the first pixel area, the first inclination, the second pixel area, the second inclination and the time difference.
11 Citations
9 Claims
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1. A method for estimating a moving speed of a vehicle, comprising:
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sequentially capturing, by an image capturing unit, a first driving vehicle image and a second driving vehicle image, wherein the first driving vehicle image and the second driving vehicle image have a time difference therebetween; performing image analysis on the first driving vehicle image to obtain a first pixel area and a first inclination of a first license plate image; performing image analysis on the second driving vehicle image to obtain a second pixel area and a second inclination of a second license plate image; and estimating the moving speed according to the first pixel area, the first inclination, the second pixel area, the second inclination and the time difference, comprising; converting the first pixel area to a corresponding first relative distance; converting the second pixel area to a corresponding second relative distance; calculating a moving distance of the vehicle according to the first relative distance, the second relative distance, the first inclination and the second inclination; and estimating the moving speed according to the moving distance and the time difference. - View Dependent Claims (2, 3)
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4. An in-vehicle camera device, comprising:
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an image capturing unit, sequentially capturing a first driving vehicle image and a second driving vehicle image of a vehicle, wherein the first driving vehicle image and the second driving vehicle image have a time difference therebetween; and a processing unit, performing image analysis on the first driving vehicle image to obtain a first pixel area and a first inclination of a first license plate image, performing image analysis on the second driving vehicle image to obtain a second pixel area and a second inclination of a second license plate image, and estimating the moving speed of the vehicle according to the first pixel area, the first inclination, the second pixel area, the second inclination and the time difference, wherein the step of estimating the moving speed of the vehicle comprises; converting the first pixel area to a corresponding first relative distance; converting the second pixel area to a corresponding second relative distance; calculating a moving distance of the vehicle according to the first relative distance, the second relative distance, the first inclination and the second inclination; and estimating the moving speed according to the moving distance and the time difference. - View Dependent Claims (5, 6)
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7. A monitoring system, comprising:
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an in-vehicle camera device, sequentially capturing a first driving vehicle image and a second driving vehicle image of a vehicle, wherein the first driving vehicle image and the second driving vehicle image have a time difference therebetween; and a server device, receiving the first driving vehicle image and the second driving vehicle image, performing image analysis on the first driving vehicle image to obtain a first pixel area and a first inclination of a first license plate image, performing image analysis on the second driving vehicle image to obtain a second pixel area and a second inclination of a second license plate image, and estimating the moving speed of the vehicle according to the first pixel area, the first inclination, the second pixel area, the second inclination and the time difference, wherein the step of estimating the moving speed of the vehicle comprises; converting the first pixel area to a corresponding first relative distance; converting the second pixel area to a corresponding second relative distance; calculating a moving distance of the vehicle according to the first relative distance, the second relative distance, the first inclination and the second inclination; and estimating the moving speed according to the moving distance and the time difference. - View Dependent Claims (8, 9)
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Specification