Method and device for detecting fog using spectroscopy
First Claim
1. A method for performing one of detection, density determination, or classification of an aerosol in an environment using at least one image of the environment taken by a camera of a vehicle, comprising:
- in a first step, ascertaining a first value of a selected parameter of the at least one image using a first color filtering;
in a second step, ascertaining a second value of the selected parameter one of;
(i) without the first color filtering, or (ii) using a second color filtering different from the first color filtering;
comparing the ascertained first and second values; and
performing, as a function of the result of the comparison, the one of detection, density determination, or classification of the aerosol,wherein;
the selected parameter is one of the average brightness value or the gradient of the pixels,the comparison of the first and second values is achieved by formation of at least one of a difference, a quotient, and a variance using gray value distribution data,the comparison of the first and second values is achieved by formation of a difference between the first and second values,the difference is compared to a first threshold value and a second threshold value higher than the first threshold vale, andthe aerosol is one of detected or classified if the difference is higher than the first threshold value and lower than the second threshold value.
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Abstract
A method for detection or the density determination or the classification of an aerosol using spectroscopy includes: using an image taken by a camera for a vehicle, a first value of a parameter being ascertained from the at least one image in a first step, using a first color filtering, and a second value for the same parameter being ascertained in a second step having a second color filtering, which is different from the preceding color filtering, and the values ascertained in the at least two steps are compared, and as a function of the result of the comparison, the detection or the density determination or the classification of the aerosol is carried out.
3 Citations
17 Claims
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1. A method for performing one of detection, density determination, or classification of an aerosol in an environment using at least one image of the environment taken by a camera of a vehicle, comprising:
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in a first step, ascertaining a first value of a selected parameter of the at least one image using a first color filtering; in a second step, ascertaining a second value of the selected parameter one of;
(i) without the first color filtering, or (ii) using a second color filtering different from the first color filtering;comparing the ascertained first and second values; and performing, as a function of the result of the comparison, the one of detection, density determination, or classification of the aerosol, wherein; the selected parameter is one of the average brightness value or the gradient of the pixels, the comparison of the first and second values is achieved by formation of at least one of a difference, a quotient, and a variance using gray value distribution data, the comparison of the first and second values is achieved by formation of a difference between the first and second values, the difference is compared to a first threshold value and a second threshold value higher than the first threshold vale, and the aerosol is one of detected or classified if the difference is higher than the first threshold value and lower than the second threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for performing one of detection, density determination, or classification of an aerosol in an environment using at least one image of the environment taken by a camera of a vehicle, comprising:
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in a first step, ascertaining a first value of a selected parameter of the at least one image using a first color filtering; in a second step, ascertaining a second value of the selected parameter one of;
(i) without the first color filtering, or (ii) using a second color filtering different from the first color filtering;comparing the ascertained first and second values; and performing, as a function of the result of the comparison, the one of detection, density determination, or classification of the aerosol, wherein the selected parameter is one of the average brightness value or the gradient of the pixels, wherein the aerosol is illuminated using vehicle headlights, and the spectral characteristic of the vehicle headlights is taken into account in the one of detection, density determination, or classification of the aerosol, and wherein a convolution of the spectrum of the headlight with absorption characteristic of at least one possible aerosol is carried out, and the aerosol is detected as a function of the convolution.
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10. A device for performing one of detection, density determination, or classification of an aerosol in an environment using at least one image of the environment taken by a camera of a vehicle, comprising:
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a parameter determination unit having at least a first color filter and a second color filter different from the first color filter, wherein the parameter determination unit is configured to; ascertain, in a first step, a first value of a selected parameter of the at least one image using a first color filtering; and ascertain, in a second step, a second value of the selected parameter one of;
(i) without using the first color filter, or (ii) using the second color filter; anda comparator configured to compare the ascertained first and second values by determining a difference between the ascertained first and second values, and perform the one of detection, density determination, or classification of the aerosol as a function of the difference, wherein; the selected parameter is one of the average brightness value or the gradient of the pixels, the difference is compared to a first threshold value and a second threshold value higher than the first threshold value, and the aerosol is one of detected or classified if the difference is higher than the first threshold value and lower than the second threshold value. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A device for performing one of detection, density determination, or classification of an aerosol in an environment using at least one image of the environment taken by a camera of a vehicle, comprising:
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a parameter determination unit having at least a first color filter and a second color filter different from the first color filter, wherein the parameter determination unit is configured to; ascertain, in a first step, a first value of a selected parameter of the at least one image using a first color filtering; and ascertain, in a second step, a second value of the selected parameter one of;
(i) without using the first color filter, or (ii) using the second color filter; anda comparator configured to determine a difference between the ascertained first and second values, and perform the one of detection, density determination, or classification of the aerosol as a function of the difference, wherein the selected parameter is one of the average brightness value or the gradient of the pixels, wherein the aerosol is illuminated using vehicle headlights, and the spectral characteristic of the vehicle headlights is taken into account in the one of detection, density determination, or classification of the aerosol, and wherein a convolution of the spectrum of the headlight with absorption characteristic of at least one possible aerosol is carried out, and the aerosol is detected as a function of the convolution.
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Specification