Method for designing optical system as oblique camera lens

Abstract

The invention relates to a method for designing an optical system as an oblique camera lens. The method comprises: an initial system consisting of an primary initial mirror, an initial secondary mirror, and an initial third mirror is established; a new object-image relationship is established, a plurality of first characteristic light rays are selected, the plurality of first characteristic lightrays are tracked forwardly from object space to an image sensor, a plurality of characteristic data points of a to-be-calculated third reflector are calculated based on the plurality of first characteristic light rays and the new object-image relationship while the primary initial mirror and the initial secondary mirror are kept to be unchanged, and curved-surface fitting is carried out on the plurality of characteristic data points to obtain a third reflector; and a plurality of view fields and a plurality of second characteristic light rays are selected, the plurality of second characteristic light rays are tracked to the object space reversely from the image sensor, a plurality of second characteristic data points of a to-be-calculated primary reflector are calculated based on the plurality of second characteristic light rays and the new object-image relationship, and curved-surface fitting is carried out on the plurality of second characteristic data points to obtain a primary reflector.

Description

technical field [0001] The invention relates to the field of imaging system design, in particular to a design method of an optical system used as a squint camera lens. Background technique [0002] A common imaging system, such as a camera, takes pictures while looking squarely at the observed target. However, in some special fields, such as observing the ground with obstacles at high altitude, the camera cannot observe the area to be observed when it is directly above the area to be observed, which requires a special imaging system, that is, the imaging system of the squint camera. See figure 1 , the area between A and B is the area to be observed, and the observation point is point C. The angle between the field of view at point A and the vertical line passing through point C is called the tilt angle. For the camera, there is a large difference in the object distance between point A and point B, and the object distance at point B is greater than that at point A. Therefo...

AI Technical Summary

Problems solved by technology

For the camera, there is a large difference in the object distance between point A and point B, and the object distance at point B is greater than that at point A. Therefore, in the obtained photo, the resolution of point A is higher than that of point B, and the resolution of the photo is uneven

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