c# - 如何使用 AForge 库提取特定帧

Question

我正在尝试从视频文件中提取特定帧。当我使用 aforge 库播放视频文件时，我有一个想要的帧。我调用了一个新帧事件，如果新帧与我的特定帧匹配，那么它会显示一条消息:“帧匹配”。此特定帧随机出现在视频文件中。这是我的代码:

private void Form1_Load(object sender, EventArgs e)
{
    IVideoSource videoSource = new FileVideoSource(@"e:\media\test\a.mkv");
    playerControl.VideoSource = videoSource;
    playerControl.Start( );
    videoSource.NewFrame += new AForge.Video.NewFrameEventHandler(Video_NewFrame );
}

private void Video_NewFrame(object sender, AForge.Video.NewFrameEventArgs eventArgs)
{
    //Create Bitmap from frame
    Bitmap FrameData = new Bitmap(eventArgs.Frame);
    //Add to PictureBox
    pictureBox1.Image   = FrameData;
    //compare current frame to specific fram
    if (pictureBox1.Image == pictureBox2.Image)
    {
        MessageBox.Show("Frame Match");  
    }
}

pictureBox2.image是我要匹配的固定框。当我播放视频文件并提取新帧时，这段代码工作正常，但我无法将新帧与特定帧进行比较。请指导我如何实现这一目标。

Answer 1

你可以看看: https://github.com/dajuric/accord-net-extensions

var capture = new FileCapture(@"C:\Users\Public\Videos\Sample Videos\Wildlife.wmv");
capture.Open();
capture.Seek(<yourFrameIndex>, SeekOrigin.Begin);
var image = capture.ReadAs<Bgr, byte>();

或者您可以使用标准的 IEnumerable，例如:

var capture = new FileCapture(@"C:\Users\Public\Videos\Sample Videos\Wildlife.wmv");
capture.Open();
var image = capture.ElementAt(<yourFrameIndex>); //will actually just cast image

包含示例。

移至:https://github.com/dajuric/dot-imaging