Frame transfer type CCD aerial camera scanning image motion compensation method

Abstract

The invention belongs to the technical field of aerial camera imaging, and relates to a frame transfer type CCD aerial camera scanning image motion compensation method. The problem that light needs to be blocked through a mechanical shutter in the prior art is solved. The method comprises the steps that (1), the pendular angle speed of the relative inertia space of an aerial camera is measured through a gyroscope, and the direction of the gyroscope sensitivity angle speed and the pendular direction of the aerial camera are consistent so that measurement errors caused by mounting nonorthogonality can be reduced; (2), the information of the camera pendular angle speed measured through the gyroscope is received through a line transfer pulse generator, and the line transfer pulse frequency of a frame transfer CCD at the image motion compensation moment is calculated; (3), in the image motion compensation stage, a generated pulse signal is calculated through a frame transfer CCD time sequence generator to drive the frame transfer CCD to carry out charge transfer, and image motion compensation is achieved; (4), in the charge read-out stage, the frame transfer CCD time sequence generator drives the frame transfer CCD to carry out charge transfer by itself according to line transfer period frequency set internally, and photosensitive imaging on a scene image point is achieved.

Description

technical field [0001] The invention belongs to the technical field of aerial camera imaging, and relates to the application of a frame transfer type area array CCD in an aerial imaging system, in particular to an aerial camera scanning image motion compensation method using a frame transfer type area array CCD. Background technique [0002] In order to expand the ground coverage width, the area array CCD aerial camera generally adopts the working mode of continuous sweep imaging. Swing scan imaging will bring scanning image motion, in order to ensure imaging resolution, scanning image motion needs to be compensated. Currently, there are generally two types of compensation methods for scanning image motion, one is optical-mechanical compensation, and the other is electronic compensation based on full-frame transfer CCD. The optomechanical compensation method adopts the method of rotating the optical elements in the imaging system to keep the scene image point and the photos...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of non-uniform exposure of CCD caused by mechanical shutter to block light in the prior art, which has a great influence on the reliability and performance of imaging system, the present invention proposes a frame transfer type CCD aerial camera scanning image motion compensation The method realizes the on-chip compensation of scanning image motion by driving the charge movement of the frame transfer CCD. This method quickly transfers the entire frame of pixel charges to the dark pixel storage area in parallel after the image motion compensation, so there is no need for a mechanical shutter to block light

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