解决相机不良反馈（几个水平线上下移动的阴影） [英] Solving camera bad feedback(several shades of horizontal lines moving up and down)

问题描述

这是很难定义我的问题，因为我不知道症状的名称，它很难通过静态图像看到它。但是，我仍然会说明它，希望你们都会得到这个问题的想法。

实时视频与水平阴影视频，非常明显，但不能通过图像。但查看接下来的2张图片：

在这里稍微更明显一些（通过背景（固定的静态图像）和当前视频流的abs差异）

在这里更明显的（通过阈值化图像。白色阴影在图像中上下移动）：

好的，所以我不知道这个症状的名字是什么，我想知道，这是什么？这是什么原因？

我试过了：

• p>增加和减少曝光




• 使用 waitkey（），以降低刷新率




• 解决方案

  p>交流灯（在美国）以60赫兹或每秒60次的速率闪烁和闪烁。可能你会得到图像上的暗和光带，因为这种闪烁与相机速率匹配。这是效果如下：

  
  
  
  
  
  

  虽然LED灯已知可以做到这一点，荧光灯也可以以较小的方式显示这种效果。要消除此问题，建议将相机更改为 PAL或NTSC模式。

  
  
  

  测试这个问题的好方法是将相机拿出来尝试使用它。上次我检查，太阳不闪烁60赫兹。 :)如果乐队坚持下去，还有另一个问题。

  
  

  It's bit difficult to define my problem as I am not sure the name of the symptoms, and its difficult to see it through static images. However I am still going to illustrate it, hope you all will get the idea of the problem.

  Real time video with the horizontal shades video, very obvious, but cannot be seen through images. But view the next 2 images:

  slightly more obvious here(through abs diff of background(a fixed static image) and current video streaming), though you have to squint your eyes to see it:

  Kind of more obvious here(through thresholding the image. The white shades are moving up and down in the image):

  Ok, so I am not sure what is the name of this symptom, I wish to know, what is this? What is the cause of this? And how can I solved it.

  THings I have tried:

  • increasing and decreasing exposure

  • increasing and decreasing resolution

  • use waitkey(), to lower the refresh rate

  • increasing and decreasing frame per second.

  Does anybody have any idea?

  解决方案

  AC lights (in the US) flicker on and off at a rate of 60 hertz, or 60 times per second. It is possible that you are getting the dark and light bands on the image because of this flickering matching up with the camera rate. This is what the effect can look like:

  While LED lamps are known to do this, florescent lamps can also exhibit this effect in a lesser way. To eliminate this issue, it is recommended to change the camera to PAL or NTSC mode.

  A good way to test out this issue would be to take the camera outside and try using it. Last time I checked, the sun does not flicker at 60 hertz. :) If the bands persist, then there is another issue going on.

  这篇关于解决相机不良反馈（几个水平线上下移动的阴影）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！