Based on the analysis of the characteristics of infrared dim small target under complex cloud background, A detection algorithm is proposed for infrared dim small target. Firstly, median filtering algorithm is employed to remove the noise effectively. Secondly, according to the characteristics of the cloud background and targets, a frequency-domain processing method based on Fourier transform and second-order Butterworth high pass filtering is proposed. The cutoff frequency of the filter is adaptively decided by establishing the relationship between the background complexity and the cutoff frequency. Lastly, target detection is achieved by threshold segmentation. Experiments showed that the algorithm can effectively detect infrared dim small target under complex cloud background.
Since sky background radiation luminance is a critical parameter of atmospheric optics, it is very important for space target detection and identification. In order to study sky background radiation luminance characteristic, the factors that influenced sky background radiation luminance were analyzed. A method which is used to evaluate sky background radiation luminance based on Image Color Index was put forward. It is valid and possible in the initial test. The method can be compared with other measurement method of sky background radiation luminance, It is as the datum which also could be used to analyses and contrast spectrum characteristic of the atmospheric aerosol particle.
Proc. SPIE. 9142, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013
Since sky background luminance is a critical parameter of atmospheric optics, it is very important for space target detection and identification. In order to acquire sky background luminance characteristic and evaluate the detecting and tracking capability of electro-optical systems for space target. Sky background luminance was measured with sky background measurement equipment in somewhere in Xinjiang. The contour distribution of all-sky background luminance in different type weather was given. Experimental data measured in fact was analyzed. The distribution characteristic of sky background was acquired， That provided important basis for researching sky background luminance, arraying electro-optical system and application of related field.