Gyeong-Il Kweon

Folded catadioptric panoramic lens with an equidistance projection scheme

A new formula for a catadioptric panoramic lens with an equidistance projection scheme has been derived. The fabricated lens has a field of view that is wider than that of any previously reported panoramic lens, and the nonimaged region near the back of the camera has a constant volume with zero angular extension.

Fisheye Lens for Image Processing Applications

We have developed a miniature fisheye lens with

Wide-angle catadioptric lens with a rectilinear projection scheme

190^{\circ}

Panoramic Image Composed of Multiple Rectilinear Images Generated from a Single Fisheye Image

field of view operating simultaneously in the visible and the near infrared wavelengths. The modulation transfer function characteristic for the visible wavelength is sufficient for a mega-pixel-grade image sensor. The lens also has a fair resolution in the infrared wavelength region. The calibrated

Design of a Mega-pixel Grade Catadioptric Panoramic Lens with the Rectilinear Projection Scheme

f-{\theta}

A catadioptric double-panoramic lens with the equidistance projection for a rangefinder application

distortion is less than 5%, and the relative illumination is over 90%. In consequence, a sharp wide-angle image can be obtained which is uniform in brightness over the entire range of field angles. The real image heights for the visible and the near infrared wavelengths have been fitted to polynomial functions of incidence angle with sub-pixel accuracies. Combined with the near equidistance projection scheme of the lens, this lens can be advantageously employed in various image-processing applications requiring a wide-angle lens.

A wide-angle catadioptric lens with the rectilinear projection

A catadioptric wide-angle lens having a rectilinear projection scheme has been developed with a view to possible applications in the security-surveillance area. The lens has been designed for a miniature camera with a video graphics array-grade 1/3 in. color CCD sensor. The field of view of the lens is over 151 degrees , and still distortion is under 1%. Furthermore, the modulation transfer function is better than 0.3 at 70 line pairs/mm over the whole active area of the image sensor.

Day and night security camera

We have developed mathematically precise image-processing algorithms for extracting rectilinear images from fisheye images as well as digital pan/tilt/zoom technology. Using this technology, vertical lines always appear as vertical lines in the panned and/or tilted images. Furthermore, polygonal panoramic images composed of multiple rectilinear images have been obtained using the developed digital pan/tilt technology.

Eigenmode of Anisotropic Planar Waveguide

A dedicated catadioptric panoramic lens with the rectilinear projection scheme is designed. The resolution is high enough to provide separate VGA quality images for the respective four directions and the image distortion is less than 0.5%.

Eigenmode of anisotropic planar waveguide

A double panoramic lens with the ideal equi-distance projection scheme has been designed and fabricated with a view of realizing a panoramic rangefinder based on vision. The vertical field of view is 110° extending from the nadir (-90°) to 20° above the horizon.