Point spread function estimation of optics blur
AssigneeNikon Corporation
InventorRadka Tezaur
Life of this patent
Estimating the term…
Abstract
A method for estimating an optics point spread function (518) of a lens assembly (20) includes (i) providing a test chart (14); (ii) providing a capturing system (22); (iii) capturing a test chart image (316) of the test chart (14) with the capturing system (22) using the lens assembly (20) to focus light onto the capturing system (22); (iv) selecting an image area (490) from the test chart image (316); (v) dividing the image area (490) into a plurality of area blocks (494); and (vii) estimating an area point spread function (518) of the image area (490) using a PSF cost function that sums the fidelity terms of at least two of the area blocks (494).
Claims21
A method for evaluating a lens assembly, the method comprising the steps of:
- providing a test chart;
- providing a capturing system;
- capturing a test chart image of the test chart with the capturing system using the lens assembly to focus light onto the capturing system;
- selecting a first image area from the test chart image;
- dividing the first image area into a plurality of first area blocks;
- and
- estimating a first area optics point spread function of the first image area using a PSF cost function that sums the fidelity terms of at least two of the first area blocks.
A system for evaluating a lens assembly estimating an optics point spread function of a lens assembly, the system comprising:
- a test chart having a test chart pattern;
- a capturing system that captures a test chart image of the test chart using the lens assembly to focus light onto the capturing system;
- a control system that (i) selects a first image area from the test chart image;
- (ii) divides the first image area into a plurality of first area blocks;
- and (iii) estimating a first area optics point spread function of the first image area using a PSF cost function that sums the fidelity terms of at least two of the first area blocks.
Dependencies are inferred from the claim text.