Method of detecting a visibility interference phenomenon for a vehicle
First Claim
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1. A detection method for detecting an interference phenomenon (F) creating atmospheric interference so as to cause a loss of visibility for a user of a motor vehicle (V), comprising the steps of:
- determining a region of interest (ROI) in an acquired image (I) of an environment (E) of said motor vehicle (V), said region of interest being vertical and occupying parts of said acquired image (I) on each side of a horizon line (H);
determining a grey-level curve (CL), taking into account only the median value of the grey levels of the pixels situated in said region of interest (ROI) of said acquired image (I);
wherein said detection method also comprises the steps of;
calculating at least one tangent (TG) from a point of interest (PT) in said grey-level curve (CL), said point of interest (PT) being situated above said horizon line (H);
determining a directing coefficient (CF) from said at least one tangent (TG);
deducing the presence of said interference phenomenon (F) from the value of said directing coefficient (CF) determined.
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Abstract
A method of detecting a visibility interference phenomenon for a motor vehicle. The method includes the steps of: determining a region of interest (ROI) in an acquired image (I) of the environment (E) of the vehicle (V); determining a grey-level curve (CL) from the region of interest (ROI); calculating at least one tangent (TG) from at least one point of interest (PT) in the grey-level curve (CL); and determining a directing coefficient (CF) from the tangent (TG).
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Citations
18 Claims
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1. A detection method for detecting an interference phenomenon (F) creating atmospheric interference so as to cause a loss of visibility for a user of a motor vehicle (V), comprising the steps of:
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determining a region of interest (ROI) in an acquired image (I) of an environment (E) of said motor vehicle (V), said region of interest being vertical and occupying parts of said acquired image (I) on each side of a horizon line (H); determining a grey-level curve (CL), taking into account only the median value of the grey levels of the pixels situated in said region of interest (ROI) of said acquired image (I); wherein said detection method also comprises the steps of; calculating at least one tangent (TG) from a point of interest (PT) in said grey-level curve (CL), said point of interest (PT) being situated above said horizon line (H); determining a directing coefficient (CF) from said at least one tangent (TG); deducing the presence of said interference phenomenon (F) from the value of said directing coefficient (CF) determined. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A device (DISP) for detecting a phenomenon (F) creating an atmospheric interference so as to cause a loss of visibility for a user of a motor vehicle (V), comprising:
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a control unit (UC) for; determining a region of interest (ROI) in an acquired image (I) of an environment (E) of said motor vehicle (V), said region of interest being vertical and occupying parts of said acquired image (I) on each side of a horizon line (H); determining a grey-level curve (CL), taking into account only the median value of the grey levels of the pixel situated in said region of interest (ROI) of lines of said acquired image (I); wherein, in addition, said control unit (UC); calculates at least one tangent (TG) from a point of interest (PT) in said grey-level curve (CL), said point of interest (PT) being situated above said horizon line (H); determines a directing coefficient (CF) from said at least one tangent (TG); deduces the presence of said phenomenon (F) from a value of a directing coefficient (CF) determined.
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Specification