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Free-form lens design for wide-angle imaging with an equidistance projection scheme |
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| Authors: | Bo Yang Jukka Tapani Mäkinen Guofan Jin |
| Institution: | a Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China b Vtt Technical Research Centre of Finland, Kaitoväylä 1, Oulu 90570, Finland c Department of Optoelectronic Engineering, Beijing Institute of Technology,Beijing 100081, China |
| Abstract: | An algorithm of free-form lens design is presented that can realize wide-angle imaging in conjunction with conventional imaging devices. The wide-angle image obtained through the free-form lens and the camera is not affected by distortions. The formula for the free-form lens surfaces is derived. The surface profile of the free-form lens can be generated through solving a differential equation expressing the camera-viewing angle as a function of the angle of incidence on the free-form lens surface. The surfaces preserve a linear relationship between the angle of incidence of light onto the surface and the angle of refraction into the imaging device. |
| Keywords: | Free-form lens Panoramic lens Equidistance projection scheme Optical design |
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