Equal-scale optical rectification method for panoramic optical image

Abstract

The invention discloses an equal-scale optical rectification method for a panoramic optical image, which belongs to the fields of measurement of aviation and spaceflight images and aims at providing the equal-scale optical rectification method for the panoramic optical image by adopting pure optical rectification to directly rectify while the image is output. The equal-scale optical rectification method comprises the following rectification process that panoramic negative pieces enclose to form a circular arc shape, wherein the circle center surface of the circular arc faces to a rectification lens, and the circle center is positioned on a primary optical axis; photographic paper is in a hyperbolic curve shape; the scale of each point on the image formed on the photographic paper is identical and is the ratio the focus length to the height of the camera; an imaging light source can use a planar light source; the photographic paper is simultaneously exposed; the rectification is carried out by using different optical axial magnification powers; and the full piece is rectified into an image with the same scale as that of the optical axis. According to the equal-scale optical rectification method disclosed by the invention, the film type panoramic image is purely and optically rectified at equal scale (focus length of the camera / flying height) and a vertical image is formed after rectification. The equal-scale optical rectification method is mainly used for rectifying the negative piece image formed by a panorama camera.

Description

technical field [0001] The invention belongs to the fields of aviation, aerospace image measurement and the like. Background technique [0002] In aerial image measurement, in order to obtain more images of ground targets, panoramic aerial photography in the form of scanning is usually used. Panoramic scan camera can scan up to 60° from left to right and the total angle can reach 120°. Panoramic camera imaging principle such as figure 1 shown. The containment area of ​​the panoramic scanning camera is pincushion-shaped, such as figure 2 shown. That is, the centerline scale is large and the edge scale is small. In this way, the scale of each point is different. Multiple images cannot be planarly mosaiced. After image correction, the scale of each point must be the same to perform image mosaic to form a vertical image map. [0003] Most of the current image corrections use digital methods for computer correction. For computer correction of film images, the process is ...

AI Technical Summary

Problems solved by technology

[0003] Most of the current image corrections use digital methods for computer correction. For computer correction of film images, the process is very complicated: first, the film image must be digitized to become a digital image, and then the digital image is corrected, and the corrected image is then output. into a photo

In the whole process, the image information will be lost many times. When the film image is digitally converted, a certain amount of shadow texture will be lost. After the image is corrected, a certain amount of shadow texture will be lost, and a certain amount of shadow texture will be lost when the image is output into a photo.

It affects the resolution of the image; when digital image is corrected, because it is an artificial image deformation, the degree of image deformation is related to the level of the programmer, and a certain amount of artificial deformation will occur

and it takes a long time to do this

At present, there is no good optical correction method to correct, especially for panoramic images, it is difficult to correct the image scale (camera focal length / aircraft height)

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