摘要
本文提出一种提高图象处理精度的方法.利用自然界中存在的噪声源或者人为地介入一个噪声源,使其标准差近于量化误差,对相对稳定信号,作m帧叠加的图象增强,可提高原图象的量化精度m^(1/2)倍.该方法已由计算机模拟和太阳磁场望远镜相应系统的实测获得证实.通过计算,我们找到了噪声大小与量化精度间的关系,并确定了该方法的适应范围.根据这一方法,可用商用的、相对廉价的、较低精度的A/D变换和图象处理系统,通过图象增强,获得很高精度太阳磁场的结果.
A method to raise accuracy of digital image processing has been proposed. B_y means of a statistic noise presented in nature or introduced artificially, putting standard error equal approximately to Unit of the quantization, the original quantization accuracy can be raised about m^(1/2) times by m frames of image enhancement. This method has been confirmed by Simulated test of computer and the practic measurement of the Solar Magnetic field. By the computation the relation between the amount of noise and the quantitation accuracy has been found. The applied range of this method has been determined. By means of the method, the image processing system with A/D converter of Low accuracy, which is commercially available and is cheaper relatively, can be used for obtaining high accuracy measurement of solar video magnetic field.
出处
《天文学报》
CSCD
北大核心
1989年第3期333-340,共8页
Acta Astronomica Sinica
基金
国家自然科学基金委员会资助重大项目
