Image Motion Compensation Method for Frame Transfer Type CCD Aerial Camera Scanning

Abstract

A frame-transfer type CCD aerial camera scanning image motion compensation method belongs to the field of aerial camera imaging technology. In order to solve the problem that the prior art requires a mechanical shutter to block light, the method: Step 1, the gyroscope measures the swing of the aerial camera relative to the inertial space Sweep angular velocity, in order to reduce the measurement error caused by installation non-orthogonality, the direction of gyro sensitive angular velocity is consistent with the direction of aerial camera swing; step 2, the line transfer pulse generator receives the information of camera swing angular velocity measured by gyro, and calculates the image motion Compensate the line transfer pulse frequency of the frame transfer CCD at the moment; step 3, in the image motion compensation stage, the pulse signal generated by the frame transfer CCD timing generator drives the frame transfer CCD to perform charge transfer to realize image motion compensation; step 4, in the charge read In the output stage, the frame transfer CCD timing generator automatically drives the frame transfer CCD to perform charge transfer according to the internally set line transfer cycle frequency, so as to realize the photosensitive imaging of the scene image points.

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

Images