Image sensor for monitoring vehicle's forward view and method for setting aspect ratio for photosensitive portion of such image sensor
First Claim
1. An image sensor for monitoring a forward view of a vehicle traveling on a roadway;
- comprisinga horizontally elongated photosensitive portion whose aspect ratio is in a range from 1;
1.8 to 1;
1;
3.1, andsaid aspect ratio being determined within said range based on parameters of a design speed of said roadway and of a number of lanes to be monitored including a lane in which said vehicle is traveling.
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Accused Products
Abstract
The photosensitive portion of an image sensor which is used for monitoring a forward view of a vehicle on a roadway is formed that is horizontally elongated with an aspect ratio in a range from 1:1.8 to 1:3.1 adjustable in correspondence with the design speed of the roadway, the minimum radius of curvature R, the maximum longitudinal slope S of the roadway, the braking distance D of the vehicle, and the number of lanes to be imaged. Here, the aspect ratio of the photosensitive portion is set at a ratio within a range from 1:1.8 to 1:3.1 in correspondence with the conditions of the design speed of the roadway and of the number of lanes to be imaged including the lane in which the vehicle is driving.
79 Citations
13 Claims
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1. An image sensor for monitoring a forward view of a vehicle traveling on a roadway;
- comprising
a horizontally elongated photosensitive portion whose aspect ratio is in a range from 1;
1.8 to 1;
1;
3.1, andsaid aspect ratio being determined within said range based on parameters of a design speed of said roadway and of a number of lanes to be monitored including a lane in which said vehicle is traveling. - View Dependent Claims (2)
- comprising
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3. A method for setting an aspect ratio of an adjustable photosensitive portion of an image sensor for monitoring a forward view of a vehicle traveling on a roadway, comprising the steps of;
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determining a type of the roadway on which said vehicle travels and said forward view of the vehicle is monitored, setting a suitable aspect ratio of said photosensitive portion based on parameters of a design speed of said roadway and of a number of lanes to be monitored including a lane on which said vehicle travels, and monitoring a forward view of the vehicle by an image sensor having said suitable aspect ratio. - View Dependent Claims (4, 5, 6, 7)
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8. An automatic navigation system for a vehicle on a roadway comprising:
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an image sensor for monitoring a forward view of the vehicle on the roadway, said image sensor including a horizontally elongated photosensitive portion whose aspect ratio is in a range from 1;
1.8 to 1;
3.1, andsaid aspect ratio being determined within said range based on parameters of a design speed of said roadway and of a number of lanes to be monitored including a lane in which said vehicle is traveling; a camera incorporating said image sensor; an image processor for processing images taken by said camera; and a controller for controlling actuators for at least one of steering, braking and acceleration of said vehicle on a basis of data acquired by said image processor.
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9. An image sensor for monitoring a forward view of a vehicle driving on a roadway, comprising:
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a horizontally elongated photosensitive portion whose aspect ratio is adjustable in a range from 1;
1.8 to 1;
3.1,means for selecting and adjusting an aspect ratio for said photosensitive portion based on a design speed of said roadway and a number of lanes to be imaged including a lane in which said vehicle is driving. - View Dependent Claims (10, 11, 12, 13)
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Specification