Image motion self-registration method for TDI imaging
A self-registration, 1. TDI technology, applied in image communication, image analysis, image data processing, etc., can solve the problems of increasing the difficulty of imaging system design, complexity and cost, poor real-time performance, and low precision
Active Publication Date: 2014-08-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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[0004] The present invention provides an image motion self-registration method for TDI imaging in order to solve the existing image motion compensation method that increases the design difficulty, complexity and cost of the imaging system, and has problems such as small compensation range, low precision, and poor real-time performance.
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[0028] Specific implementation mode 1. Combination Figure 1 to Figure 4 In this embodiment, an image movement self-registration method for TDI imaging is described. The system equipment of the method includes an imaging system with programmable capability (eg, FPGA, CPLD, etc.), an imaging turntable, a guide rail or a target.
[0029] This embodiment is specifically described by taking an FPGA imaging system as an example, and is also applicable to other programmable devices. The imaging turret or guide is used to carry the imaging system so that the imaging system can scan with it. The target is the imaged target scene. The specific steps of this embodiment are:
[0030] Step 1: Build a theoretical model of the image-movement self-registration algorithm; the specific process is:
[0031] Step A, real-time acquisition of the current frame image P i+1 (m,n), and calculate the image shift S of the current frame image P (i) The number of pixels corresponding to Δn(i) is exp...
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An image motion self-registration method for TDI imaging relates to the field of photoelectric detection imaging and solves the problems that an existing image motion compensation method increases design difficulties, complexity and cost of an imaging system, the compensation range is small, precision is low, and instantaneity is poor. By means of the image motion self-registration method for TDI imaging, on the basis of image motion speed, positional deviation of each frame of pixel for an image sensor is obtained, and in the TDI process of a numeric field, row and column registration and alignment calculation are conducted according to a deviation value, so that the aims of achieving TDI while completing pixel-level image motion compensation are achieved. Angular deviation of an image motion speed vector is adjusted through column-wise registration, and speed deviation of the image motion speed vector is adjusted through row-wise registration. The image motion self-registration method for TDI imaging is adopted, in the TDI process of scanning and imaging, alignment and calculation of registration pixels are achieved. With rely on a flexible numeric field operation, scanning of a TDI camera and clear imaging under the condition of different image motion directions and image motion speeds are easily and effectively achieved.
Description
technical field [0001] The invention relates to the field of photoelectric detection imaging, in particular to a method for realizing image movement compensation of a TDI scanning camera. Background technique [0002] Time Delay Integral (TDI) technology can greatly improve the sensitivity and signal-to-noise ratio of imaging systems when closely matched to scan speed by exposing the same target multiple times. Therefore, it is widely used in high-resolution aerospace remote sensing, machine vision, low-light imaging and other fields. Regardless of whether it is TDICCD or digital domain TDI, as long as the TDI imaging mode must have image shift mismatch, there must be a precise image motion compensation mechanism during the scanning and imaging process of the TDI camera, otherwise the image shift mismatch will cause the optical system transfer function to drop. Even distort and blur the image. [0003] The existing image movement compensation measures mainly include optica...
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Inventor 陶淑苹曲宏松郑晓云金光
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI