【作者】 黄洪；

【导师】 王振宇； 王跃进；

【作者基本信息】 华南理工大学 ， 软件工程， 2015， 硕士

【摘要】 鱼眼镜头是一种超广角镜头,它一般被定义为水平视角可达到180度的镜头。使用鱼眼镜头拍照取得的图像为鱼眼图像。鱼眼图像的畸变程度较大,并且离图像的中心越远,其畸变程度越大。鱼眼图像的校正是近年来国内外研究的热点课题。全景拼接是一种能将环绕摄像头360度拍摄的一组或多组照片拼接成一幅全景图像的技术。普通图像一般只能表现局部画面,称之为局部图像,而能够表现整体(水平视角范围为360度)画面的图像称为全景图像。理论上,可将两幅水平视角为180度的鱼眼图像拼接为一个360度的全景图像。全景拼接技术在军事红外图像、医学图像、遥感图像和虚拟现实等方面有广泛的应用前景。本文在分析和总结了国内外对鱼眼图像校正和图像拼接的研究成果基础上,完成了如下所示的具体工作：1.本文重点研究鱼眼摄像头的成像模型——等距投影模型,从实际生产环境考虑,提出了改进的等距投影模型T。该模型通过对棋盘校正图像的“直线趋近误差”的计算,寻找使误差最小化的参数(k,b),以弥补生产工艺中可能带来的误差,并对改进算法进行实验和评价,证明改进算法平均减少了63.65%的“直线趋近误差”；2.本文对完成了畸变校正的鱼眼图像,做进一步的图像几何校正。本文对比分析了两种几何校正方法,选择较为科学的“基于三维投影变换的校正方法”,在其基础上进行拓展延伸,增加一组“自由度”系数,使得原方法的应用更灵活；3.本文借助棋盘标定板,利用两幅棋盘图像中的角点信息进行图像配准,并运用最小二乘法原理,减少了13.59%的角点对配准误差；4.本文以“双线性插值”理论基础,对图像拼接中的图像融合方法进行改进,提出“基于双线性插值的图像融合方法”,减少了图像融合过程中18.98%的信息损失；5.本文在完成以上工作的基础之上,将改进或拓展的方法设计为各个功能模块,集成到鱼眼镜头视频软件中,完成了本课题的软件实现,并对主要模块进行测试,最终证明软件通过了测试。更多还原

【Abstract】 Fish eye lens is a wide-angle lens, it is generally defined as a lens which can reach180degree of view in the horizontal direction. Image using fisheye lens photographs made forfisheye images.The distortion of fish eye image is seriously and the farther away from thecenter of the image, the greater the degree of distortion. Great attentions have been paid onfisheye image correction in recent years.Panorama stitching is a kind of technology which can get a composite image frommultiple cameras surrounded by panoramic views. The common image generally can onlyshow the local (horizontal viewing angle range is about120degrees) range, which is calledthe local image, while the image which can show the global range is called a panoramic image.Panorama stitching technology has extensive application prospect in military infrared images,medical images, remote sensing images and virtual reality etc.After the analysis andsummary of relevant research results about the correction andmosaic of fisheye images at home and abroad the following major work has been done1. This paper focuses on the model of fish eye camera imaging--equidistant projectionmodel, puts forward an improved isometric projection model T, to compensate for potentialerrors in the production process, itshow that the improved algorithm has made a63.65%reduction in error.2. The paper made a comparative analysis of two kinds of geometric correction method,choose the more scientific method based on3D projection transformation. On the foundation,add a set of "freedom" coefficients, making the application of the original method moreflexible.3. With the help of the checkerboard calibration plate, this paper realizesthe imageregistration according to the corners between two pieces of chessboard image. And it use theleast square method to make a13.59%reduction in error of corners registration.4. This paper improves the method of image fusion. According to the theoreticalfoundation of "bilinear interpolation", this method can reduce18.98%loss caused in theprocess of image fusion.5. This paper adds all these methods to the Fisheye Lens Video Software, and tests themain modules, may be the ultimate proof of the tests passing.更多还原