本文關鍵詞：基于RGA的快速光學遙感圖像艦船目標檢測算法研究　出處：《西南交通大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 姿態(tài)回歸 位置關系 輪廓完整性 先驗信息 感興趣區(qū)域

【摘要】：遙感技術具有偵查范圍廣,全天候,不受地理限制等優(yōu)點,應用前景廣闊�；谶b感圖像的目標檢測作為遙感圖像應用中重要的一環(huán),其對于資源調查、災害檢測以及軍用偵查都具有重要的研究意義。由于遙感圖像的復雜多樣性,目標檢測需要解決顏色紋理、旋轉尺度變化、形似干擾物等一系列難點問題;同時隨著遙感技術的發(fā)展,遙感信息數(shù)據(jù)的快速增長,依靠人工判別不能滿足實時性的要求,這些都對遙感圖像目標的檢測提出了新的挑戰(zhàn)。復雜背景下兼顧目標檢測的精度和速度對于實時性應用具有非常重要的意義和價值。本文以光學遙感圖像艦船目標為研究對象,圍繞復雜背景下的目標檢測算法的精度和效率進行研究。針對復雜背景下目標輪廓附近的噪聲干擾、形似干擾物及目標部分遮擋等影響的問題,本文在RGA姿態(tài)一致性算法的基礎上,設計了一種基于姿態(tài)回歸的艦船檢測方法。方法主要包括三個部分:(1)根據(jù)艦船模板輪廓點之間的位置關系和RGA分布,得到每個輪廓點及其鄰域同姿態(tài)點,對被檢目標輪廓點姿態(tài)估計時,將其與模板輪廓點及近鄰同姿態(tài)點校驗,抑制噪聲點對目標中心的投票;(2)采用艦船局部連接結構加權的方法,提升具有艦船目標特征的整體投票比重,以增加V型設施、矩形等形似干擾物和目標之間的區(qū)分度;(3)在現(xiàn)有方法的基礎上重新定義了輪廓命中率和最大非連續(xù)因子,對檢測目標采用艦船模板輪廓命中率和最大連續(xù)丟失率進行修正,并對最后檢測結果與回歸的模板輪廓完整性進行綜合判別,去除虛警。實驗證明,本章的方法對目標輪廓附近的噪聲具有良好的適應性,并且可以較好區(qū)分形似干擾物。在復雜背景下較目前最好的方法檢測準確率提高了 8%左右。針對姿態(tài)回歸艦船檢測算法的時間復雜度過高問題,本文設計了一種基于顯著性的快速艦船目標檢測算法。首先,選用以超像素作為基本計算單位的對比度顯著性檢測方法,通過結合各超像素的顏色和空間距離差異得到對比度先驗圖,突出目標區(qū)域和背景區(qū)域的差異;其次,為了得到更準確的目標中心位置,使用超像素之間的差異值作為局部特征構建凸包確定目標的大致位置,對不同位置的超像素使用高斯模型賦予不同權重,得到中心先驗圖;同時為進一步抑制邊界背景,在對比度先驗圖和中心先驗圖的基礎上融合了邊界背景先驗圖,通過三種先驗信息融合的顯著性檢測方法快速精準的提取目標感興趣區(qū)域,最后采用姿態(tài)回歸的方法在感興趣區(qū)域進行艦船目標檢測。實驗證明,復雜背景下本文算法有效快速去除背景區(qū)域的同時,檢測準確率也得到一定提升。相比于RGA方法和姿態(tài)回歸方法,該算法檢測準確率分別提高了 12.9%和4.8%,檢測時間降低了72%和78%。
[Abstract]:Remote sensing technology has the advantages of wide range of detection, all-weather, no geographical restrictions, and so on. As an important part of remote sensing image application, target detection based on remote sensing image is an important part of resource investigation. Disaster detection and military investigation are of great significance. Because of the complexity and diversity of remote sensing images, target detection needs to solve a series of difficult problems, such as color texture, rotation scale change, shape like interference object, etc. At the same time, with the development of remote sensing technology, the rapid growth of remote sensing information data, relying on manual discrimination can not meet the requirements of real-time. All of these put forward new challenges to target detection in remote sensing image. It is very important and valuable for real-time application to take into account the accuracy and speed of target detection in complex background. In this paper, the object of ship in optical remote sensing image is considered. Marked as the object of study. Focusing on the accuracy and efficiency of the target detection algorithm in complex background, aiming at the noise interference near the target contour, the shape of the jamming object and the partial occlusion of the target in the complex background, and so on. This paper is based on the RGA attitude consistency algorithm. A ship detection method based on attitude regression is designed. The method includes three parts: 1) according to the position relation and RGA distribution of ship template contour points. Each contour point and its neighborhood same attitude point are obtained. When the contour point attitude is estimated, it is checked with the template contour point and the nearest neighbor pose point to suppress the noise point voting on the target center. (2) the weighted method of local connection structure is used to increase the proportion of the whole voting with the characteristics of the ship's target, so as to increase the distinction between the V-shaped facilities, the rectangle and the object. 3) based on the existing methods, the contour hit ratio and maximum discontinuity factor are redefined, and the ship template contour hit ratio and the maximum continuous loss rate are corrected. Finally, the integrity of the final detection results and the regression template contour is comprehensively identified to remove false alarm. Experiments show that the method proposed in this chapter has a good adaptability to the noise near the target contour. Compared with the best method in complex background, the detection accuracy is improved by about 8%. Aiming at the problem of high time complexity of attitude regression ship detection algorithm. In this paper, we design a fast ship target detection algorithm based on saliency. Firstly, we choose the contrast significance detection method with super-pixel as the basic unit of calculation. By combining the color and spatial distance difference of each super-pixel, the contrast priori map is obtained to highlight the difference between the target region and the background area. Secondly, in order to get a more accurate target center position, the difference value between the super-pixels is used as the local feature to construct the convex hull to determine the approximate position of the target. Gao Si model is used to give different weights to superpixels in different positions, and a central prior map is obtained. At the same time, in order to further restrain the boundary background, the boundary background priori graph is fused on the basis of contrast prior graph and central prior graph. Through three priori information fusion salience detection methods quickly and accurately extract the region of interest of the target, and finally use the attitude regression method to detect the ship target in the region of interest. In the complex background, the algorithm can remove the background area effectively and quickly, and the detection accuracy is also improved, compared with the RGA method and attitude regression method. The detection accuracy of the algorithm is improved by 12.9% and 4.8, and the detection time is reduced by 72% and 78 respectively.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP751

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