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Cat eye effect object recognition algorithm of active and passive imaging system sharing same aperture

An imaging system and target recognition technology, which is applied in the field of laser imaging and digital image processing, can solve the problems that the recognition method is not suitable for target recognition, and achieve the effect of improving accuracy

Inactive Publication Date: 2011-09-28
BEIHANG UNIV
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Problems solved by technology

[0005] 1. Purpose: This invention aims at the defect that the recognition method based on grayscale and shape features is not suitable for target recognition in complex backgrounds, and proposes an improved algorithm for the common aperture imaging system, that is, image difference operation is performed after image registration

Method used

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  • Cat eye effect object recognition algorithm of active and passive imaging system sharing same aperture
  • Cat eye effect object recognition algorithm of active and passive imaging system sharing same aperture
  • Cat eye effect object recognition algorithm of active and passive imaging system sharing same aperture

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Embodiment Construction

[0019] The invention adopts a continuous laser as an active light source to realize all-weather target recognition, uses a dichroic beam splitter to reflect visible light through infrared light, and uses two CCD cameras to obtain active and passive images respectively.

[0020] figure 2 For the algorithm flowchart of the present invention, the specific steps of the algorithm are as follows:

[0021] 1. Image horizontal mirror flip and Gaussian filter: The active and passive images of the same scene are obtained through two CCDs. The system structure determines that the imaging of CCD1 and CCD2 is a horizontal mirror relationship. It is necessary to perform horizontal mirror flip on one of the images, and then use a Gaussian filter to Active and passive image filtering;

[0022] 2. Image registration: Image registration includes two parts: feature point detection and feature point matching. Use SIFT (Scale-InvariantFeature Transform, that is, scale invariant feature transfor...

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Abstract

The invention provides a cat eye effect object recognition algorithm of active and passive imaging systems sharing a same aperture. The algorithm is suitable for detecting and recognizing optical targets with a characteristic of cat eye effect. The algorithm of the invention improves the cat eye effect object recognition algorithm based on gray scales and shape features. For the active and passive imaging systems sharing the same aperture, differential operation is performed between active and passive images after image registration so that background can be filtered. Rough registering algorithm can be improved. A search scope of matching feature points in a second image can be reduced in horizontal and vertical directions. And algorithm efficiency can be raised. The algorithm possesses good utility value and wide application prospect in the fields of laser imaging and digital image processing technology.

Description

(1) Technical field [0001] The invention is a target recognition algorithm for photoelectric equipment or sighting equipment with optical lenses. The invention relates to acquiring active and passive images and identifying "cat's eye" effect targets by using a common aperture active and passive imaging system, belonging to the technical field of laser imaging and digital image processing. (2) Background technology [0002] When the laser is aimed at an optical system with an optical lens, the optical system can be approximately regarded as a combination of a lens and a focal plane of a detector. An "image spot" is formed nearby, and this "image spot" is equivalent to a light source. The laser beam is reflected back at a certain beam divergence angle through the optical system. According to the reversible principle of the optical path, the laser beam will return along the original path, thus producing The light intensity of concentrated parallel reflection light is much high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/60
Inventor 李丽刘丽党二升吴磊
Owner BEIHANG UNIV
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