Linear shift variant camera lens model for image simulation
Real camera lenses possess imaging characteristics that can vary significantly across the image field. Over typical fields of view, linear shift invariant imaging models are unable to accurately predict the 2D irradiance distribution produced at the lens image plane from a radiance distribution at the object plane. This paper describes a linear shift variant camera lens model that is capable of generating a 2D irradiance image with accurate radiometry which also includes the effects of monochromatic aberrations, chromatic aberrations, pupil aberrations, vignetting, and diffraction that vary across the field of view. The model incorporates and automates the use of optical point spread functions (PSF), distortion data, and relative illumination data calculated using a commercial lens design software package. Typical lenses were modeled and the resulting simulated images are shown. Anticipated uses of the model include the evaluation of lens designs and visualization of camera performance, generation of aerial image data for virtual camera simulators, and classroom instruction of imaging systems principles. Non-ideal systems like cell phone cameras and atypical applications like hyperspectral or thermal imaging could also derive a great deal of benefit.
Maeda, P. Y. Linear shift variant camera lens model for image simulation. IS&T/SPIE International Symposium Electronic Imaging 2005 Conference; 2005 January 16-20; San Jose; CA; USA.