METHOD AND ARRANGEMENT FOR OBTAINING INFORMATION ABOUT OBJECTS AROUND A VEHICLE
Arrangement and method for obtaining information about objects exterior of a vehicle in which a light source is mounted in the vehicle, structured light is projected into an area of interest exterior of the vehicle, rays of light forming the structured light originate from the light source, reflected light is detected at an image sensor at a position different than the position from which the structured light is projected, and the reflected light is analyzed relative to the projected structured light to obtain information about the object in the area of interest exterior of the vehicle. The structured light is designed to appear as if it comes from a source of light (virtual or actual) which is at a position different than the position of the image sensor.
1 . A method for obtaining information about the area surrounding a vehicle or objects external of the vehicle, comprising:
mounting a light source on the vehicle;
projecting structured light into an area of interest external to the vehicle, rays of light forming the structured light originating from the light source, the structured light being a pattern of light including a plurality of light areas and at least one dark area alongside one another;
detecting reflected light at an image sensor arranged on the vehicle at a position different than the position from which the structured light is projected and at a position from which light reflected from any objects in the area of interest in the exterior of the vehicle is received; and
analyzing the reflected light relative to the projected structured light to obtain information about the area of interest and objects located in the area of interest.
2 . The method of claim 1 , wherein the light source is mounted inside and projecting outside of the vehicle such that information about an object or topology exterior of the passenger compartment of the vehicle is obtained.
3 . The method of claim 1 , further comprising imposing a pattern of the light and dark areas in the projected structured light.
4 . The method of claim 1 , further comprising arranging the image sensor at a different location in the vehicle than the light source such that the structured light originating from the light source is directed into the area of interest in a first direction and is reflected to the image sensor by any objects in the area of interest in a second direction which is not opposite to the first direction.
5 . The method of claim 4 , further comprising arranging the image sensor such that a line between the image sensor and the area of interest is at an angle of 20° to 45° to a line between the location from which the structured light is projected and the area of interest.
6 . The method of claim 1 , further comprising
projecting at least one structured light pattern from the light source into the area of interest; and
modifying the light pattern to create a virtual light source different than the light source.
7 . The method of claim 6 , further comprising:
generating the at least one structured light pattern by interposing a first filter between the light source and the area of interest which blocks at least one portion of the light being projected from the light source to thereby create a dark area of the pattern of light; and
arranging a second filter similar to the first filter between the area of interest and the image sensor.
8 . The method of claim 1 , wherein the analyzing step comprises determining a distance between the light source and at least a part of an object in at least a part of the area of interest.
9 . The method of claim 1 , wherein the structured light comprises lines of light spaced apart from one another with the lines of light being light areas in the pattern of light and spaces between the lines of light being dark areas of the pattern of light such that light and dark areas alternate with one another in the pattern of light.
10 . The method of claim 1 , wherein the structured light comprises dots of light spaced apart from one another.
11 . The method of claim 1 , further comprising forming the structured light by polarizing the rays of light from the light source so that different parts of the area of interest are illuminated with light having different polarization.
12 . The method of claim 1 , further comprising forming the structured light by imposing spatial patterns on the rays of light from the light source such that the time domain is used to identify particular transmission angles with particular reflections.
13 . The method of claim 1 , further comprising imposing a pattern of the light and dark areas in the projected structured light.
14 . The method of claim 1 , further comprising
projecting at least one structured light pattern from the light source into the area of interest; and
modifying the light pattern to create a virtual light source different than the light source.
15 . The method of claim 14 , further comprising:
generating the at least one structured light pattern by interposing a first filter between the light source and the area of interest which blocks at least one portion of the light being projected from the light source to thereby create a dark area of the pattern of light; and
arranging a second filter similar to the first filter between the area of interest and the image sensor.
16 . The method of claim 1 , wherein the step of analyzing the reflected light relative to the projected structured light to obtain information about the area of interest and the object when located in the area of interest comprises analyzing light from a plurality of points on the object reflected at the same time whereby the obtained information is information about a three-dimensional form of the objects between the points from which light was reflected at the same time.
17 . The method of claim 1 , further comprising arranging the image sensor at a different location in the vehicle than the light source such that an angle greater than zero is defined between the projecting structured light beam impacting the object and the received reflected light arising from that impacting beam of projected structured light.
18 . A method for obtaining information about the area surrounding a vehicle or objects external of the vehicle, comprising:
mounting a light source in the vehicle;
projecting structured light into an area of interest external to the vehicle, rays of light forming the structured light originating from the light source, the structured light being a pattern of light including a plurality of discrete light areas and at least one discrete dark area alongside one another;
detecting reflected light at an image sensor arranged on the vehicle at a position different than the position from which the structured light is projected and at a position from which light reflected from any objects in the area of interest external to the vehicle is received; and
analyzing the reflected light relative to the projected structured light to obtain information about the area of interest external to the vehicle and the object when located in the area of interest.
19 . The method of claim 18 , wherein the analyzing step comprises determining a distance between the light source and at least a part of an object in at least a part of the area of interest.
20 . The method of claim 18 , wherein the structured light comprises lines of light spaced apart from one another with the lines of light being light areas in the pattern of light and spaces between the lines of light being dark areas of the pattern of light such that light and dark areas alternate with one another in the pattern of light.