Infrared target detection based on surfacelet transform and total variation

2015 ◽  
Author(s):  
Dong Zhao ◽  
Huixin Zhou ◽  
Ying Zhao ◽  
Shenghui Rong ◽  
Rui Lai ◽  
...  
Keyword(s):  
Total Variation ◽  
Target Detection ◽  
Surfacelet Transform

scholarly journals Infrared Small Target Detection Based on Four-Direction Overlapping Group Sparse Total Variation

2020 ◽  
Vol 37 (3) ◽  
pp. 367-377
Author(s):  
Liqiong Zhang ◽  
Min Li ◽  
Xiaohua Qiu ◽  
Ying Zhu
Keyword(s):  
Total Variation ◽  
Target Detection ◽  
Small Target ◽  
Small Target Detection ◽  
Infrared Small Target

scholarly journals Infrared Small Target Detection with Total Variation and Reweighted ℓ1 Regularization

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Houzhang Fang ◽  
Min Chen ◽  
Xiyang Liu ◽  
Shoukui Yao
Keyword(s):  
Total Variation ◽  
Target Detection ◽  
Objective Measure ◽  
Real Data ◽  
Small Target ◽  
Target Image ◽  
Small Target Detection ◽  
Complex Background ◽  
Patch Image ◽  
Infrared Small Target

Infrared small target detection plays an important role in infrared search and tracking systems applications. It is difficult to perform target detection when only a single image with complex background clutters and noise is available, where the key is to suppress the complex background clutters and noise while enhancing the small target. In this paper, we propose a novel model for separating the background from the small target based on nonlocal self-similarity for infrared patch-image. A total variation-based regularization term for the small target image is incorporated into the model to suppress the residual background clutters and noise while enhancing the smoothness of the solution. Furthermore, a reweighted sparse constraint is imposed for the small target image to remove the nontarget points while better highlighting the small target. For higher computational efficiency, an adapted version of the alternating direction method of multipliers is employed to solve the resulting minimization problem. Comparative experiments with synthetic and real data demonstrate that the proposed method is superior in detection performance to the state-of-the-art methods in terms of both objective measure and visual quality.

Selective Attention and Error Processing in an Illusory Conjunction Task

2005 ◽  
Vol 19 (3) ◽  
pp. 216-231 ◽  
Author(s):  
Albertus A. Wijers ◽  
Maarten A.S. Boksem
Keyword(s):  
Target Detection ◽  
Event Related Potentials ◽  
Illusory Conjunction ◽  
Conjunction Error ◽  
Error Related Negativity ◽  
Display Element ◽  
Related Potentials ◽  
Feature Error ◽  
High Level ◽  
Correct Target

Abstract. We recorded event-related potentials in an illusory conjunction task, in which subjects were cued on each trial to search for a particular colored letter in a subsequently presented test array, consisting of three different letters in three different colors. In a proportion of trials the target letter was present and in other trials none of the relevant features were present. In still other trials one of the features (color or letter identity) were present or both features were present but not combined in the same display element. When relevant features were present this resulted in an early posterior selection negativity (SN) and a frontal selection positivity (FSP). When a target was presented, this resulted in a FSP that was enhanced after 250 ms as compared to when both relevant features were present but not combined in the same display element. This suggests that this effect reflects an extra process of attending to both features bound to the same object. There were no differences between the ERPs in feature error and conjunction error trials, contrary to the idea that these two types of errors are due to different (perceptual and attentional) mechanisms. The P300 in conjunction error trials was much reduced relative to the P300 in correct target detection trials. A similar, error-related negativity-like component was visible in the response-locked averages in correct target detection trials, in feature error trials, and in conjunction error trials. Dipole modeling of this component resulted in a source in a deep medial-frontal location. These results suggested that this type of task induces a high level of response conflict, in which decision-related processes may play a major role.

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