Aircraft detection system
First Claim
Patent Images
1. An object detection system including:
- passive sensing means for receiving electromagnetic radiation from a moving object in a field of view and generating intensity signals representative of the received radiation and for generating images of said radiation at successive periods of time from said intensity signals; and
processing means for processing said images to obtain a background image, subtracting said background image from said images to obtain respective difference images, summing pixel values across a dimension of said difference images to obtain respective image profiles, and generating difference profiles of said image profiles by obtaining the difference between successive ones of said image profiles, said difference profiles representing time derivatives of the image profiles and providing a differential signature representative of the position of said moving object.
1 Assignment
0 Petitions
Accused Products
Abstract
An object detection system including passive sensors for receiving electromagnetic radiation from a moving object and generating intensity signals representative of the received radiation, and a processing system for subtracting the intensity signals to obtain a differential signature representative of the position of the moving object. An image acquisition system including at least one camera for acquiring an image of at least part of a moving object, in response to a trigger signal, and an analysis system for processing the image to locate a region in the image including markings identifying the object and processing the region to extract the markings for optical recognition.
80 Citations
44 Claims
-
1. An object detection system including:
-
passive sensing means for receiving electromagnetic radiation from a moving object in a field of view and generating intensity signals representative of the received radiation and for generating images of said radiation at successive periods of time from said intensity signals; and processing means for processing said images to obtain a background image, subtracting said background image from said images to obtain respective difference images, summing pixel values across a dimension of said difference images to obtain respective image profiles, and generating difference profiles of said image profiles by obtaining the difference between successive ones of said image profiles, said difference profiles representing time derivatives of the image profiles and providing a differential signature representative of the position of said moving object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 22)
-
-
11. An object detection system including:
-
passive sensing means for receiving electromagnetic radiation from a moving object and generating intensity signals representative of the received radiation, said passive sensing means having pyroelectric sensors with different fields of view and said intensity signals including at least first and second signals representative of the thermal radiation present in said views, respectively, and processing means for subtracting said intensity signals to obtain a differential signature representative of the position of said moving object, said processing means subtracting said first and second signals to obtain a differential signal including said differential signature. - View Dependent Claims (12, 13)
-
-
14. An image acquisition system including:
-
at least one camera for acquiring an image of at least part of a moving object, in response to a trigger signal, and analysis means for processing said image to locate a region in said image including markings identifying said object and for processing said region to extract said markings for a recognition process, such that said analysis means sub-samples said image, extracts lines exceeding a predetermined length and at predetermined angles, binarises the image, removes features smaller or larger than said markings, removes features not clustered as said markings, and locates said region using the remaining features. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
-
-
23. An object detection method including:
-
passively sensing electromagnetic radiation received from a moving object in a field of view; generating intensity signals representative of the received radiation; generating images of said radiation at successive periods of time from said intensity signals; processing said images to obtain a background image; subtracting said background image from said images to obtain respective difference images; summing pixel values across a dimension of said difference images to obtain respective image profiles; and generating difference profiles of said image profiles by obtaining the difference between successive ones of said image profiles, said difference profiles representing time derivatives of the image profiles and providing a differential signature representative of the position of said moving object. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 44)
-
-
33. An object detection method including:
-
passively sensing electromagnetic radiation received from a moving object; generating intensity signals representative of the received radiation; and subtracting said intensity signals to obtain a differential signature representative of the position of said moving object, said passive sensing including pyroelectric sensing with different fields of view, said intensity signals including at least first and second signals representative of the thermal radiation present in said views, respectively, and said subtracting including subtracting said first and second signals to obtain a differential signal including said differential signature. - View Dependent Claims (34, 35)
-
-
36. An image acquisition method including:
-
acquiring an image of at least part of a moving object, in response to a trigger signal, using at least one camera, and processing said image to locate a region in said image including markings identifying said object and processing said region to extract said markings for recognition process, said processing to locate said region including sub-sampling said image, extracting lines exceeding a predetermined length and at predetermined angles, binarising the image, removing features smaller or larger than said markings, removing features not clustered as said markings, and locating said region using the remaining features. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
-
Specification