本文關(guān)鍵詞：面向虛擬瀏覽的全景圖像處理　出處：《天津大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 全景圖像 球面圖像 圖像特征 測地線網(wǎng)格 全景插值 圖像克隆

【摘要】：隨著圖像拼接技術(shù)的不斷發(fā)展與全景數(shù)據(jù)采集設(shè)備的日趨成熟,全景圖像的獲取變得越來越容易。由于能夠提供遠(yuǎn)超普通圖像的視野,全景圖像被廣泛應(yīng)用于虛擬瀏覽系統(tǒng)中,并促使了街景服務(wù)的產(chǎn)生。當(dāng)用戶對視角進(jìn)行移動時,這些虛擬瀏覽系統(tǒng)往往采用圖像過渡技術(shù)來緩解視角的跳躍感。然而這種方法會使場景變得比較模糊,對用戶體驗造成負(fù)面影響。此外,現(xiàn)有系統(tǒng)僅僅是對原始采集數(shù)據(jù)的簡單展示,缺乏相關(guān)的編輯與加工。這些都限制了全景圖像在虛擬瀏覽系統(tǒng)中的應(yīng)用潛力。針對上述問題,本文提出了面向虛擬瀏覽的全景圖像處理技術(shù),主要包括以下創(chuàng)新點。提出了一種快速、魯棒的全景圖像二值特征提取算法。該算法借助測地線網(wǎng)格對球面全景圖像進(jìn)行均勻參數(shù)化表示�；谶@種近似規(guī)則的六邊形網(wǎng)格表示方法,算法利用像素灰度值大小的比較直接在球面域內(nèi)對特征點進(jìn)行檢測和描述。實驗表明,該算法相對于基于球面調(diào)和函數(shù)的方法在描述精度以及提取速度上均有較大提升。針對現(xiàn)有街景系統(tǒng)瀏覽過程中場景被模糊的問題提出了一種全景圖像的插值技術(shù)。該算法將平面圖像視點插值算法中的匹配、三角化、插值過程拓展至球面域,取得了物理性能可靠、視覺效果令人滿意的插值結(jié)果。同時,提出了補償矩陣的方案來解決全景序列插值時的抖動現(xiàn)象。針對全景數(shù)據(jù)的編輯問題,提出了球面全景圖像克隆技術(shù)。該算法用球面均值坐標(biāo)為權(quán)重將克隆區(qū)域邊界的顏色差擴(kuò)散至區(qū)域內(nèi)部,使克隆結(jié)果的顏色與形狀均能與目標(biāo)圖像保持一致。同時,算法解決了全景圖像克隆特有的克隆區(qū)域朝向保持問題以及可能出現(xiàn)的顏色洇染問題。實驗表明,本文的算法達(dá)到了實時的克隆性能并能取得比平面克隆更好的結(jié)果。
[Abstract]:With the development of image mosaic technology and the maturation of panoramic data acquisition equipment, the acquisition of panoramic image becomes more and more easy. Panoramic images are widely used in virtual browsing systems and promote the generation of streetscape services. These virtual browsing systems often use image transition technology to alleviate the sense of jump. However, this method will make the scene more fuzzy, and have a negative impact on the user experience. The existing system is only a simple display of raw data, lack of related editing and processing. All these limit the application potential of panoramic image in virtual browsing system. In this paper, a panoramic image processing technology for virtual browsing is proposed, including the following innovations. Robust binary feature extraction algorithm for panoramic images. The algorithm uses geodesic meshes to uniformly parameterize spherical panoramic images. A hexagonal mesh representation method based on this approximate rule is presented. The algorithm uses the comparison of pixel gray value to detect and describe the feature points in spherical domain directly. Compared with the method based on spherical harmonic function, the algorithm improves the accuracy of description and the speed of extraction. A panoramic image interpolation technique is proposed to solve the problem that the scene is blurred in the browsing process of the existing streetscape system. The algorithm matches the view interpolation algorithm of plane image. Triangulation, interpolation process extended to the spherical domain, the physical performance of reliable, visual results are satisfactory. At the same time. The scheme of compensation matrix is proposed to solve the jitter phenomenon of panoramic sequence interpolation. A spherical panoramic image cloning technique is proposed, in which the color difference of the boundary of the cloned region is diffused to the interior of the region by using the spherical mean coordinate as the weight. The color and shape of the cloning results are consistent with the target image. At the same time, the algorithm solves the problem of clone region orientation retention and color blotting that may occur in the cloning of panoramic image. The algorithm achieves real-time cloning performance and can obtain better results than planar cloning.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TP391.41

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相關(guān)期刊論文 前1條

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本文編號：1421609