Image-shifting 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, low precision, and small compensation range
Active Publication Date: 2017-01-18
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 Describe this embodiment, the image shift self-registration method of TDI imaging, the system equipment of this method includes an imaging system with programmable capabilities (such as: 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 track is used to carry the imaging system so that the imaging system can follow the scanning motion. The target is the target scene for imaging. The concrete steps of this embodiment are:
[0030] Step 1. Construct the theoretical model of image-shifting 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 movement S of the current frame image P (i) The corresponding number of ...
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The image motion self-registration method of TDI imaging involves the field of photoelectric detection imaging, and solves the existing image motion compensation methods that increase the design difficulty, complexity and cost of the imaging system, and there are problems such as small compensation range, low precision, and poor real-time performance. The invention obtains the pixel position deviation of each frame of the image sensor based on the image motion speed. In the process of TDI in the digital domain, row and column registration and alignment accumulation are performed according to the deviation value, so as to achieve the purpose of completing pixel-level image motion compensation at the same time as TDI. The angle deviation of the image-movement velocity vector is adjusted through the column-wise registration; the speed deviation of the image-movement velocity vector is adjusted through the row-wise registration. The invention adopts the designed image motion self-registration method to realize the alignment and accumulation of registration pixels during the time delay integration process of scanning imaging, and relies on flexible digital domain operations, thereby simply and effectively realizing different image motion directions and image motion speeds The TDI camera scans and images clearly in both large and small cases.
Description
technical field [0001] The invention relates to the field of photoelectric detection and imaging, in particular to a method for realizing image motion compensation of a TDI scanning camera. Background technique [0002] Time delay integration (TDI) technology can greatly improve the sensitivity and signal-to-noise ratio of the imaging system when it strictly matches the scanning 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 many other fields. Whether it is TDI CCD or digital domain TDI, as long as the TDI imaging mode must have image motion mismatch, so there must be a precise image motion compensation mechanism in the scanning imaging process of the TDI camera, otherwise the image motion mismatch phenomenon will cause the transfer function of the optical system to drop , and even distort and blur the image. [0003] The existing image motion compensation mea...
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IPC IPC(8): G06T7/00H04N5/232
Inventor 陶淑苹曲宏松郑晓云金光
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI