Free-form lens design for wide-angle imaging with an equidistance projection scheme

Bo Yang (Corresponding Author), Jukka-Tapani Mäkinen, Mika Aikio, Guofan Jin, Yongtian Wang

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)74-78
Number of pages5
Issue number2
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed


  • Free-form lens
  • Panoramic lens
  • Equidistance projection scheme
  • Optical design

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