22.7 Converting Live Video to Images
The “Live To Image” button in Figure 22.3 will convert the live video to images. The “Live To Image” code is:
private void button4_Click(object sender, System.EventArgs e)
{
if ( ! f.mainMenuToAPI .lv63 .getCaptureStatus () )
{
richTextBox1.Text = "Please set the mode to Live Video\n,
click the Source button, then Live Button!\n"
+ "The Mode button is right in front of the Live button.\n";
return;
}
try{
f.mainMenuToAPI .lv63.setVideoToImagesDir
( f.gui.videoLiveParameters .imageOutputFolder);
f.mainMenuToAPI .lv63.setNumOfFrames
( f.gui.videoLiveParameters .captureNumberOfFrames ) ;
f.mainMenuToAPI .lv63.setTimeInterval
( f.gui.videoLiveParameters .captureTimeInterval ) ;
mer1.Interval = f.gui.videoLiveParameters .captureTimeInterval ;
}
catch (Exception ee)
{
richTextBox1.Text = ee.ToString () + "\n";
return;
}
if ( ! f.mainMenuToAPI .lv63.getVideoToImagesDirStatus () )
{
richTextBox1.Text = "Set Live Video To Image Directory Fails!" ;
return;
}
richTextBox1.Text = "Output directory:\n"
+ f.mainMenuToAPI .lv63.getVideoToImagesDir ();
liveID = 0;
timer1.Enabled = true;
}
Basically, this button simply starts the timer via the following statement:
timer1.Enabled = true;
The rest of the statements are for various tests. Figure 22.3 has the following constructor:
public Parameter_VideoInput(Form1 f1)
{
InitializeComponent();
f = f1;
img = f.pictureBox2 ;
}
Here object, img, is the picture box where the live image will be obtained. The timer will convert the live video into images as follows:
private void timer1_Tick(object sender, System.EventArgs e)
{
string s =
f.mainMenuToAPI .lv63.getVideoToImagesDir ()
+ DateTime.Now.Year+ "_"
+ DateTime.Now.Month + "_"
+ DateTime.Now.Day + "_"
+ DateTime.Now.Hour + "_"
+ DateTime.Now.Minute + "_"
+ DateTime.Now.Second + "_"
+ ( DateTime.Now.Millisecond /10 )
+ ".jpg";
richTextBox1.Text = "" + (liveID ++) + ". " + s;
try
{
img.Image.Save ( s,System.Drawing.Imaging.ImageFormat.Jpeg );
}
catch (Exception ei )
{
richTextBox1.Text = ei.ToString () ;
}
if (liveID >= f.mainMenuToAPI .lv63.getNumOfFrames () )
{
timer1.Enabled = false;
richTextBox1.Text = "Live Video To Image Conversion End! ";
}
}
The key statement is:
img.Image.Save ( s,System.Drawing.Imaging.ImageFormat.Jpeg );
which will save the image in the Picture Box to a jpeg file. The following statement simply stops the timer when the number of pre-determined frames has been reached:
if (liveID >= f.mainMenuToAPI .lv63.getNumOfFrames () )
{
timer1.Enabled = false;
richTextBox1.Text = "Live Video To Image Conversion End! ";
}
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