Extended depth-of-field surveillance imaging system
First Claim
1. An imaging system for imaging an object within an extended depth-of-field (EDOF) at an imaging wavelength λ
- , comprising along an optical axis;
a lens system having a total lens power φ
T and an amount of spherical aberration SA, wherein 0.2λ
≦
SA≦
2λ
, the lens system comprising;
a) a first most objectwise lens group that consists of first and second confronting meniscus lens elements that have an overall optical power φ
1 such that |φ
1/φ
T|≦
0.05;
b) a second most imagewise lens group comprising three lens elements, where two of the lens elements form a doublet that includes one negative lens element;
c) an aperture stop arranged either between the first and second lens groups or within the second lens group; and
an image sensor arranged to receive the image and form therefrom a digitized electronic raw image.
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Accused Products
Abstract
An extended depth-of-field (EDOF) surveillance imaging system (8) that has a lens system (10) with a total lens power φT and an amount of spherical aberration SA where 0.2λ≦SA≦2λ. The lens system includes first lens group (G1) and a second lens group (G2). The first lens group has first and second confronting meniscus lens elements (L1, L2) that have an overall optical power φ1 such that |φ1/φT|≦0.05. The second lens group has a doublet (D1) and a most imagewise positive lens element (L5). An aperture stop (AS) is arranged either between the first and second lens groups or within the second lens group. An image sensor (30) is arranged to receive the image and form therefrom a digitized electronic raw image. An image processor receives and digitally filters the digitized electronic raw image to form a digitized contrast-enhanced image.
-
Citations
15 Claims
-
1. An imaging system for imaging an object within an extended depth-of-field (EDOF) at an imaging wavelength λ
- , comprising along an optical axis;
a lens system having a total lens power φ
T and an amount of spherical aberration SA, wherein 0.2λ
≦
SA≦
2λ
, the lens system comprising;a) a first most objectwise lens group that consists of first and second confronting meniscus lens elements that have an overall optical power φ
1 such that |φ
1/φ
T|≦
0.05;b) a second most imagewise lens group comprising three lens elements, where two of the lens elements form a doublet that includes one negative lens element; c) an aperture stop arranged either between the first and second lens groups or within the second lens group; and an image sensor arranged to receive the image and form therefrom a digitized electronic raw image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- , comprising along an optical axis;
Specification