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一种新颖的图像抗渐晕技术 被引量:5
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作者 冯强 霍俊彦 杨海涛 《电子科技》 2007年第10期67-70,共4页
渐晕效果(Vignetting)是指在光学系统输出端的信号产生与位置有关的亮度衰减,使得图像的外围出现阴影的现象。文中在分析现有算法的基础上提出了一种线性逼近的算法。该方法能够有效地去除渐晕效果,并具有内存占用小,运算复杂度低等优点。
关键词 vignetting LUT 线性逼近曲线法
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Geometrical Optics from the Ground up
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作者 Jan Vrbik 《Applied Mathematics》 2020年第10期1021-1040,共20页
We review, with proper derivation and proofs, the common undergraduate formulas for building images of objects using a system of lenses with spherical surfaces. This is done using the first-order approximation which a... We review, with proper derivation and proofs, the common undergraduate formulas for building images of objects using a system of lenses with spherical surfaces. This is done using the first-order approximation which assumes that light rays deviate from the symmetry axis by only small angles. Yet, even this most basic approximation results in surprisingly complex theory, which is then applied to explain workings of everyday optical instruments. 展开更多
关键词 Paraxial Approximation Cardinal Points Ray-Transfer Matrix Keystone Distortion Exit Pupil Aparture and vignetting
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