像空间彩色数字全息研究

Research of Color Digital Holography in Image Space

彩色数字全息检测研究中,当物体的投影尺寸与CCD面阵尺寸有较大差异时,为充分获取物体信息,可以使用透镜系统对物光进行变换,并且,基于物和像的相似特性,将物体的像视为像空间中的物体在像空间中进行彩色数字图像重建是常用的方法。像空间中确定不同波长光照的物体的像平面,按照同一物理尺寸重建不同色光的像光场是应用研究中必须解决的问题。提出一种不必知道光学系统的透镜参数而通过实验确定不同色光像平面的简易方法,并基于数字全息重建像焦深的研究,在像空间中较好地重建了物体的彩色图像。

In order to obtain sufficient information about object-wave fields when there are large differences between the size of the object and CCD array, it is a common way to transform object light with lens system in the detection research of color digital holography. Based on the similar characteristics of object and image, the image of object is often viewed as object fields in image space and the reconstructed color digital image. It is a problem that must be solved to determine imaging plane of object when illuminated by lights with different wavelengths and to reconstruct these image fields with the same size. A new simple method of determining image plane of different-color lights without knowing lens parameters of optical system is presented. Further more, based on focal-depth research of digital holographic reconstructed image, the color image of object is Key words