面向虚拟浏览的全景图像处理

发布时间：2018-01-14 02:21

本文关键词：面向虚拟浏览的全景图像处理　出处：《天津大学》2016年博士论文　论文类型：学位论文

【摘要】：随着图像拼接技术的不断发展与全景数据采集设备的日趋成熟,全景图像的获取变得越来越容易。由于能够提供远超普通图像的视野,全景图像被广泛应用于虚拟浏览系统中,并促使了街景服务的产生。当用户对视角进行移动时,这些虚拟浏览系统往往采用图像过渡技术来缓解视角的跳跃感。然而这种方法会使场景变得比较模糊,对用户体验造成负面影响。此外,现有系统仅仅是对原始采集数据的简单展示,缺乏相关的编辑与加工。这些都限制了全景图像在虚拟浏览系统中的应用潜力。针对上述问题,本文提出了面向虚拟浏览的全景图像处理技术,主要包括以下创新点。提出了一种快速、鲁棒的全景图像二值特征提取算法。该算法借助测地线网格对球面全景图像进行均匀参数化表示。基于这种近似规则的六边形网格表示方法,算法利用像素灰度值大小的比较直接在球面域内对特征点进行检测和描述。实验表明,该算法相对于基于球面调和函数的方法在描述精度以及提取速度上均有较大提升。针对现有街景系统浏览过程中场景被模糊的问题提出了一种全景图像的插值技术。该算法将平面图像视点插值算法中的匹配、三角化、插值过程拓展至球面域,取得了物理性能可靠、视觉效果令人满意的插值结果。同时,提出了补偿矩阵的方案来解决全景序列插值时的抖动现象。针对全景数据的编辑问题,提出了球面全景图像克隆技术。该算法用球面均值坐标为权重将克隆区域边界的颜色差扩散至区域内部,使克隆结果的颜色与形状均能与目标图像保持一致。同时,算法解决了全景图像克隆特有的克隆区域朝向保持问题以及可能出现的颜色洇染问题。实验表明,本文的算法达到了实时的克隆性能并能取得比平面克隆更好的结果。
[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.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TP391.41

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