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On-line Separation of Transmitted and Reflected Images from their Overlapping Images

透射图像和反射图像与重叠图像的在线分离

基本信息

批准号：
09650462
负责人：
OHNISHI Noboru
金额：
$ 2.11万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650462/
关键词：
reflected images specular reflection polarization on-line processing

项目摘要

We often see scenes where an object's image is reflected on window glass and overlaps with an image of another object behind the glass. This research proposed on-line methods for eliminating images reflected specularly on a smooth surface such as glass and plastic. Our methods are based on the optical property that light reflected on glass is polarized, while light transmitted through glass is less polarized. It is possible to eliminate reflected light with a polarizing filter. The polarization direction, however, changes even for planar glass and is not easily determined without information about the position and orientation of the glass and objects relative to the camera. Our method uses a series of images obtained by rotating a polarizing filter placed in front of a camera. Reflected images are removed by selecting just minimum image intensity among a series of images for each pixel. We propose two methods for estimating minimum image ; one is min-max method and the other parameter estimation method. We conducted experiments with real images and compared the performances of the two methods. As a result, we could generate high quality image without reflected images at semi-video rate of 15 frames per second for gray images and 5 frames for color images.

我们经常看到这样的场景，一个物体的图像反射在窗户玻璃上，并与玻璃后面另一个物体的图像重叠。这项研究提出了消除玻璃和塑料等光滑表面镜面反射图像的在线方法。我们的方法是基于这样的光学特性，即反射在玻璃上的光是偏振的，而透过玻璃的光是较弱的偏振。用偏振滤光片可以消除反射光。然而，即使对于平面玻璃，偏振方向也会发生变化，如果没有关于玻璃和对象相对于相机的位置和方向的信息，就不容易确定。我们的方法使用了一系列图像，这些图像是通过旋转放置在相机前的偏振滤光片获得的。通过从每一像素的一系列图像中仅选择最小图像强度来去除反射图像。我们提出了两种估计最小图像的方法，一种是极小极大法，另一种是参数估计法。我们用真实图像进行了实验，并对两种方法的性能进行了比较。结果，我们可以生成没有反射图像的高质量图像，灰度图像的半视频率为15帧/秒，彩色图像的半视频率为5帧/秒。