在网络摄像头图像中查找投资回报率 [英] Find ROI in a webcam image

问题描述

我有一个视频序列，其中一帧如下所示，如下所示。
我尝试使用角点检测来查找纸张上矩形的边缘。

我使用的是Shi-Tomasi角检测器。然而它检测到我不需要从图像的背景的许多其他事情。

第二个问题：

在视频序列中检测到角点后，我需要在矩形内播放另一个视频。我试图这样做使用单线程，但它导致了很多滞后和颠簸。我可以做什么来提高我的处理速度。我需要为每个视频使用多个主题。一个视频来自网络摄像头，另一个来自硬盘驱动器。

解决方案

这里是我为之前的一个

1. 查找图片中的所有轮廓，并用4个角形对每个轮廓进行逼近


2. 矩形与您自己的条件，如矩形面积> 1000000


3. （可选）你会注意到，你的矩形不是真正的矩形，因为3D世界。

在所找到的矩形上绘制绿色或任何纹理>

对于不稳定的播放，你不仅可以使用GPU的多线程，还可以使用加密来提高速度。

I have a video sequence of which one frame is shown below as shown below. I was trying to use corner detection to find the edges of the rectangle on the sheet of paper.

I am using the Shi-Tomasi corner detector for the same. However it detects a number of other things that I don't need from the background of the image. How can I narrow down my ROI to only the sheet of paper.

Second Question:
In the video sequence upon detecting The corners I need to play another video inside the rectangle. I was trying to do this using a single thread but it lead to a lot of lag and jerks. What can I possibly do to improve my processing speed. Do I need to use multiple threads for each video. One video is from the webcam while the other is from the hard-drive.

解决方案

Here is what I did for one of previous projects.

1. Find all contours in your picture and approximate each with 4 corner shape
2. Find right rectangle with your own condition such as rectangle with area > 1000000
3. (optional) you will notice that your rectangle is not real rectangle because of 3D world. You might want to do perspective transformation to get correct rectangle
4. Paint green or whatever texture on the found rectangle since you already have 4 corners from above

As for jerky playing, you might want to use not only multithreading with GPU but also encryption to improve speed.

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