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ContrastInfo Property

Summary

Helper property to get the range, default value, and other information for the Contrast property.

Syntax

C++

public VideoProcAmpInfo ContrastInfo { get; }

Public ReadOnly Property ContrastInfo As Leadtools.Multimedia.VideoProcAmpInfo

public: 
property Leadtools.Multimedia.VideoProcAmpInfo^ ContrastInfo { 
   Leadtools.Multimedia.VideoProcAmpInfo^ get(); 
}

Property Value

A VideoProcAmpInfo object.

Remarks

The information returned for this property is a VideoProcAmpInfo object containing all the related property information.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
public VideoProcAmp _videoprocamp; 
public string _outFile = Path.Combine(LEAD_VARS.MediaDir, "VideoProcAmp_SetAutoValueExample.avi"); 
 
// this example demonstrates how to set an auto value on the 
// video proc amp object. 
 
public void SetManualValueExample() 
{ 
   // reference the capture control 
   CaptureCtrl capturectrl = _form.CaptureCtrl; 
 
   try 
   { 
      // select the first device with Logitech in it's name 
      // Replace "Logitech" with your video capture device name 
      if (capturectrl.VideoDevices["Logitech"] == null) 
         throw new Exception("No Logitech video devices available!"); 
 
      capturectrl.VideoDevices["Logitech"].Selected = true; 
 
      // set a video compressor 
      capturectrl.VideoCompressors.Mpeg2.Selected = true; 
 
      // set the target file 
      capturectrl.TargetFile = _outFile; 
 
      // reference the video proc amp 
      _videoprocamp = capturectrl.VideoProcAmp; 
 
      // try to set the auto value 
      if (_videoprocamp != null) 
      { 
         // set the saturation to the maximum supported value 
         _videoprocamp.Saturation = _videoprocamp.SaturationInfo.Max; 
 
         // set the sharpness to the minimum value 
         _videoprocamp.Sharpness = _videoprocamp.SharpnessInfo.Min; 
 
         // set the white balace to the maximum value 
         _videoprocamp.WhiteBalance = _videoprocamp.WhiteBalanceInfo.Max; 
 
         // set the hue to the minimum value 
         // later in the timer we will bump this value using the stepDelta 
         _videoprocamp.Hue = _videoprocamp.HueInfo.Min; 
 
         // subscribe to the capture progress event  
         // so we can play with the hue setting above 
         capturectrl.Progress += new ProgressEventHandler(CaptureCtrl_Progress); 
      } 
 
      // check for video capture available 
      if (capturectrl.IsModeAvailable(CaptureMode.Video)) 
      { 
         // capture 15 seconds of video 
         capturectrl.UseTimeLimit = true; 
         capturectrl.TimeLimit = 15; 
 
         // subscribe to the compete event 
         capturectrl.Complete += new EventHandler(CaptureCtrl_Complete); 
         // start the capture 
         capturectrl.StartCapture(CaptureMode.Video); 
      } 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
 
   // we'll loop on the state and pump messages for this example. 
   // but you should not need to if running from a Windows Forms application. 
   while (capturectrl.State == CaptureState.Running) 
      Application.DoEvents(); 
} 
 
void CaptureCtrl_Progress(object sender, ProgressEventArgs e) 
{ 
   if (_videoprocamp != null) 
   { 
      // roll the hue value around while capturing 
      _videoprocamp.Hue += _videoprocamp.HueInfo.StepDelta; 
 
      // reset it to the minimum if we reach the max 
      if (_videoprocamp.Hue >= _videoprocamp.HueInfo.Max) 
         _videoprocamp.Hue = _videoprocamp.HueInfo.Min; 
   } 
} 
 
void CaptureCtrl_Complete(object sender, EventArgs e) 
{ 
   // set the result to what we expect 
   _result = File.Exists(_outFile); 
} 
 
static class LEAD_VARS 
{ 
   public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 19\Media"; 
}

Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As CaptureCtrlForm = New CaptureCtrlForm() 
Public _videoprocamp As VideoProcAmp 
Public _outFile As String = Path.Combine(LEAD_VARS.MediaDir, "VideoProcAmp_SetAutoValueExample.avi") 
 
' this example demonstrates how to set an auto value on the 
' video proc amp object. 
 
Public Sub SetManualValueExample() 
   ' reference the capture control 
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl 
 
   Try 
      ' select the first device with analog in it's name 
      ' Replace "Analog" with your video capture device name 
      If capturectrl.VideoDevices("Logitech") Is Nothing Then 
         Throw New Exception("No Logitech video devices available!") 
      End If 
 
      capturectrl.VideoDevices("Logitech").Selected = True 
 
      ' set a video compressor 
      capturectrl.VideoCompressors.Mpeg2.Selected = True 
 
      ' set the target file 
      capturectrl.TargetFile = _outFile 
 
      ' reference the video proc amp 
      _videoprocamp = capturectrl.VideoProcAmp 
 
      ' try to set the auto value 
      If Not _videoprocamp Is Nothing Then 
         ' set the saturation to the maximum supported value 
         _videoprocamp.Saturation = _videoprocamp.SaturationInfo.Max 
 
         ' set the sharpness to the minimum value 
         _videoprocamp.Sharpness = _videoprocamp.SharpnessInfo.Min 
 
         ' set the white balace to the maximum value 
         _videoprocamp.WhiteBalance = _videoprocamp.WhiteBalanceInfo.Max 
 
         ' set the hue to the minimum value 
         ' later in the timer we will bump this value using the stepDelta 
         _videoprocamp.Hue = _videoprocamp.HueInfo.Min 
 
         ' subscribe to the capture progress event  
         ' so we can play with the hue setting above 
         AddHandler capturectrl.Progress, AddressOf CaptureCtrl_Progress 
      End If 
 
      ' check for video capture available 
      If capturectrl.IsModeAvailable(CaptureMode.Video) Then 
         ' capture 15 seconds of video 
         capturectrl.UseTimeLimit = True 
         capturectrl.TimeLimit = 15 
 
         ' subscribe to the compete event 
         AddHandler capturectrl.Complete, AddressOf CaptureCtrl_Complete 
         ' start the capture 
         capturectrl.StartCapture(CaptureMode.Video) 
      End If 
   Catch e1 As Exception 
      _result = False 
   End Try 
 
   ' we'll loop on the state and pump messages for this example. 
   ' but you should not need to if running from a Windows Forms application. 
   Do While capturectrl.State = CaptureState.Running 
      Application.DoEvents() 
   Loop 
End Sub 
 
Private Sub CaptureCtrl_Progress(ByVal sender As Object, ByVal e As ProgressEventArgs) 
   If Not _videoprocamp Is Nothing Then 
      ' roll the hue value around while capturing 
      _videoprocamp.Hue += _videoprocamp.HueInfo.StepDelta 
 
      ' reset it to the minimum if we reach the max 
      If _videoprocamp.Hue >= _videoprocamp.HueInfo.Max Then 
         _videoprocamp.Hue = _videoprocamp.HueInfo.Min 
      End If 
   End If 
End Sub 
 
Private Sub CaptureCtrl_Complete(ByVal sender As Object, ByVal e As EventArgs) 
   ' set the result to what we expect 
   _result = File.Exists(_outFile) 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 19\Media" 
End Class

Requirements

Target Platforms

Reference

VideoProcAmp Class

VideoProcAmp Members

Help Version 19.0.2017.10.27

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies