Vehicle front-view monitoring system
First Claim
Patent Images
1. A vehicle front-view monitoring system for taking fail-safe measures comprising:
- a camera device for taking an image of a view in front;
a calculator for calculating luminance data on the image, wherein the luminance data provides a source for a luminance-distribution characteristic value indicating a horizontal luminance-distribution on the image; and
a determination section for determining whether there is a fail occurring on the image taken by the camera,wherein the determination section determines the fail based on a parameter obtained by normalizing the luminance-distribution characteristic value by a shutter speed for the camera device, andwherein the parameter is obtained by dividing the luminance-distribution characteristic value by the shutter speed for the camera device.
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Abstract
A vehicle front-view monitoring system determines whether there is a fail occurring on the monitoring system based on luminance data on an image of a front view taken by camera and takes fail-safe measures if the fail is occurring. The luminance data indicates luminance-distribution characteristic values indicating horizontal luminance-distribution on the image. A fail can be determined based on a parameter obtained by normalizing the luminance-distribution characteristic values by a shutter speed for the camera equipment.
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Citations
29 Claims
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1. A vehicle front-view monitoring system for taking fail-safe measures comprising:
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a camera device for taking an image of a view in front; a calculator for calculating luminance data on the image, wherein the luminance data provides a source for a luminance-distribution characteristic value indicating a horizontal luminance-distribution on the image; and a determination section for determining whether there is a fail occurring on the image taken by the camera, wherein the determination section determines the fail based on a parameter obtained by normalizing the luminance-distribution characteristic value by a shutter speed for the camera device, and wherein the parameter is obtained by dividing the luminance-distribution characteristic value by the shutter speed for the camera device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A vehicle front-view monitoring system for taking a fail-safe measure comprising:
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a camera device for taking an image of a view in front; a calculator for calculating luminance data on the image; and a determination section for determining whether there is a fail occurring on the monitoring system based on the luminance data, the fail-safe measure being taken if the fail is occurring, wherein the calculator calculates a luminance center as the luminance data, the luminance center corresponding to a horizontal position on the image at which there is a convergence of luminance, and the calculator calculates a luminance moment indicating a horizontal luminance distribution based on the luminance center and normalizes the luminance moment by dividing the luminance moment by a total of luminance values of sample pixels on the image, the determination section determines the fail by evaluating the horizontal luminance distribution on the image based on the luminance center normalized luminance moment. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A vehicle front-view monitoring system, comprising:
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a camera device which is mounted on the vehicle for taking an image of a view in front of the vehicle; an image recognition device which receives image data from said camera device; a vehicle state alteration device which is in communication with said image recognition device and alters a vehicle condition based upon image data criteria when there is deemed not to be a monitoring system failure; a determination section for determining whether there is a monitoring system failure based on a luminance state condition; and a fail safe implementation device which places said monitoring system in a fail safe mode based on the determination section determining a luminance based monitoring system failure has occurred, which fail safe mode precludes an activity in said vehicle state alteration device; and requirement means for determining whether one or more fail safe interruption criteria is present, which requirement means is associated with one or more of the following criteria; a) that an upper luminance saturation factor LR1 is larger than a lower luminance saturation factor LR2; b) that a number of luminance edges EN of an area of the vehicle in front is smaller than a reference number; c) that a number of the calculation of the distance data is smaller than a reference number; d) that a luminance-distribution characteristics parameter normalized by a shutter speed VAR′
is greater than a reference value;e) that a maximum addition of luminance normalized by a shutter speed Amax′
is larger than a reference value; andf) that a normalized luminance moment LM′
is smaller than center corresponding to a horizontal position on the image which luminance are converged is smaller than a reference value,wherein said requirement means determining that fail safe mode activation is appropriate only if all of criteria a to fare satisfied, wherein said luminance state condition is a luminance condition deemed to present a potential for a lowered monitoring accuracy condition, and wherein said fail safe implementation device precludes any activity in said vehicle state alteration device until a restatement condition, wherein monitoring accuracy is judged acceptable, is established. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification