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An object detection system for a host vehicle includes an imaging device operable to capture image data representative of a scene exterior the host vehicle. An image processor processes captured image data to detect an object. A ranging device tracks the detected object and determines distance to th

An object detection system for a host vehicle includes an imaging device operable to capture image data representative of a scene exterior the host vehicle. An image processor processes captured image data to detect an object. A ranging device tracks the detected object and determines distance to the detected object. The detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle. The priority score is at least in part established responsive to image processing by the image processor of captured image data and to distance determined by the ranging unit. The detected object is assigned its priority score based on one of (i) the detected object being a vehicle that is closing with the host vehicle and (ii) the detected object being a pedestrian who is present in the field of view of said imaging device.

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1. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a two-dimensional pix

1. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a two-dimensional pixelated imaging array having a plurality of photo-sensing pixels arranged on a semiconductor substrate;an image processor processing captured image data to detect an object present in the field of view of said imaging device;a ranging device;said ranging device tracking the detected object;said ranging device determining distance to the detected object;wherein the detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle;wherein the priority score is at least in part established responsive to image processing by said image processor of captured image data and to distance determined by said ranging unit;wherein the detected object is assigned its priority score based on one of (i) the detected object being a vehicle that is closing with the host vehicle and (ii) the detected object being a pedestrian who is present in the field of view of said imaging device; andwherein a beam emitted by said ranging device at least one of (a) tracks the detected object while the detected object moves in the field of view of said imaging device and (b) stays on the detected object while the detected object moves in the field of view of said imaging device. 2. The object detection system of claim 1, wherein, responsive at least in part to image processing of captured image data by said image processor, a light beam emitted by a light source of the host vehicle impinges the detected object. 3. The object detection system of claim 2, wherein said ranging device comprises a Lidar module, said Lidar module comprising said light source, a detector and a scanner. 4. The object detection system of claim 1, wherein said ranging device is operable to determine distance to the detected object via a time of flight calculation. 5. The object detection system of claim 1, wherein said image processor processes captured image data to detect multiple objects in the field of view of said imaging device and wherein said system prioritizes detected objects based on at least one of (i) proximity of a detected object to the host vehicle, (ii) speed of a detected object relative to the host vehicle and (iii) location of a detected object relative to the host vehicle. 6. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a two-dimensional pixelated imaging array having a plurality of photo-sensing pixels arranged on a semiconductor substrate;an image processor processing captured image data to detect an object present in the field of view of said imaging device;a ranging device;said ranging device tracking the detected object;said ranging device determining distance to the detected object;wherein the detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle;wherein the priority score is at least in part established responsive to image processing by said image processor of captured image data and to distance determined by said ranging unit;wherein the detected object is assigned its priority score based on one of (i) the detected object being a vehicle that is closing with the host vehicle and (ii) the detected object being a pedestrian who is present in the field of view of said imaging device;wherein said image processor processes captured image data to detect multiple objects in the field of view of said imaging device and wherein said system prioritizes detected objects based on at least one of (i) proximity of a detected object to the host vehicle, (ii) speed of a detected object relative to the host vehicle and (iii) location of a detected object relative to the host vehicle; andwherein said system guides a steerable beam of said ranging device towards a detected object in accordance with prioritization of the detected objects. 7. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a two-dimensional pixelated imaging array having a plurality of photo-sensing pixels arranged on a semiconductor substrate;an image processor processing captured image data to detect an object present in the field of view of said imaging device;a ranging device;said ranging device tracking the detected object;said ranging device determining distance to the detected object;wherein the detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle;wherein the priority score is at least in part established responsive to image processing by said image processor of captured image data and to distance determined by said ranging unit;wherein the detected object is assigned its priority score based on one of (i) the detected object being a vehicle that is closing with the host vehicle and (ii) the detected object being a pedestrian who is present in the field of view of said imaging device;wherein said image processor processes captured image data to detect multiple objects in the field of view of said imaging device and wherein said system prioritizes detected objects based on at least one of (i) proximity of a detected object to the host vehicle, (ii) speed of a detected object relative to the host vehicle and (iii) location of a detected object relative to the host vehicle; andwherein said system guides a steerable beam of said ranging device toward a first detected object for a first period of time and said system guides a steerable beam of said ranging device toward a second detected object for a second period of time. 8. The object detection system of claim 7, wherein the first detected object has a higher priority than the second detected object and said first period of time is greater than said second period of time. 9. The object detection system of claim 7, wherein said imaging device comprises part of at least one of (a) an adaptive cruise control system of the host vehicle, (b) a collision warning system of the host vehicle and (c) a pedestrian detection system of the host vehicle. 10. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a two-dimensional pixelated imaging array having a plurality of photo-sensing pixels arranged on a semiconductor substrate;an image processor processing captured image data to detect an object present in the field of view of said imaging device;a ranging device;said ranging device tracking the detected object;said ranging device determining distance to the detected object;wherein the detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle;wherein the priority score is at least in part established responsive to image processing by said image processor of captured image data and to distance determined by said ranging unit;wherein the detected object is assigned its priority score based on one of (i) the detected object being a vehicle that is closing with the host vehicle and (ii) the detected object being a pedestrian who is present in the field of view of said imaging device; andwherein the priority score assigned to the detected object determines the dwell time at the detected object of a beam emitted by said ranging device. 11. The object detection system of claim 10, wherein said ranging device comprises a Lidar device. 12. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a two-dimensional pixelated imaging array having a plurality of photo-sensing pixels arranged on a semiconductor substrate;an image processor processing captured image data to detect an object present in the field of view of said imaging device;a ranging device;said ranging device tracking the detected object;said ranging device determining distance to the detected object;wherein the detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle;wherein the priority score is at least in part established responsive to image processing by said image processor of captured image data and to distance determined by said ranging unit;wherein the detected object is assigned its priority score based on one of (i) the detected object being a vehicle that is closing with the host vehicle and (ii) the detected object being a pedestrian who is present in the field of view of said imaging device; andwherein a beam emitted by said ranging device is mechanically steerable responsive to image processing of captured image data by said image processor. 13. The object detection system of claim 12, wherein the priority score is representative of the importance of the detected object in the field of view. 14. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a CMOS two-dimensional pixelated imaging array having a plurality of photo-sensing pixels;an image processor processing captured image data to detect an object present in the field of view of said imaging device;a ranging device;said ranging device tracking the detected object;said ranging device determining distance to the detected object;wherein the detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle;wherein the priority score is at least in part established responsive to image processing by said image processor of captured image data and to distance determined by said ranging unit;wherein the detected object is assigned its priority score based on the detected object being a pedestrian who is present in the field of view of said imaging device; andwherein a beam emitted by said ranging device at least one of (a) tracks the detected object while the detected object moves in the field of view of said imaging device and (b) stays on the detected object while the detected object moves in the field of view of said imaging device. 15. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a CMOS two-dimensional pixelated imaging array having a plurality of photo-sensing pixels;an image processor processing captured image data to detect an object present in the field of view of said imaging device;a ranging device;said ranging device tracking the detected object;said ranging device determining distance to the detected object;wherein the detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle;wherein the priority score is at least in part established responsive to image processing by said image processor of captured image data and to distance determined by said ranging unit;wherein the detected object is assigned its priority score based on the detected object being a pedestrian who is present in the field of view of said imaging device; andwherein, responsive at least in part to image processing of captured image data by said image processor, a light beam emitted by a light source of the host vehicle impinges the detected object. 16. An object detection system for a host vehicle, said object detection system comprising: an imaging device having a field of view exterior of the host vehicle and operable to capture image data representative of a scene exterior the host vehicle;said imaging device comprising a CMOS two-dimensional pixelated imaging array having a plurality of photo-sensing pixels;an image processor processing captured image data to detect an object present in the field of view of said imaging device;a ranging device;said ranging device tracking the detected object;said ranging device determining distance to the detected object;wherein the detected object is assigned a priority score that represents the potential danger of the detected object to the host vehicle;wherein the priority score is at least in part established responsive to image processing by said image processor of captured image data and to distance determined by said ranging unit;wherein the detected object is assigned its priority score based on the detected object being a vehicle that is closing with the host vehicle; andwherein a beam emitted by said ranging device at least one of (a) tracks the detected object while the detected object moves in the field of view of said imaging device and (b) stays on the detected object while the detected object moves in the field of view of said imaging device. 17. The object detection system of claim 16, wherein, responsive at least in part to image processing of captured image data by said image processor, a light beam emitted by a light source of the host vehicle impinges the detected object.