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ContrastInfo Property

Summary

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

Syntax

C++/CLI

public VideoProcAmpInfo ContrastInfo { get; }

public: 
property VideoProcAmpInfo^ ContrastInfo { 
   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 USB in it's name 
      // Replace "USB" with your video capture device name 
      if (capturectrl.VideoDevices["USB"] == null) 
         throw new Exception("No USB video devices available!"); 
 
      capturectrl.VideoDevices["USB"].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 brightness to the mid supported value 
         _videoprocamp.Brightness = (_videoprocamp.BrightnessInfo.Max - _videoprocamp.BrightnessInfo.Min) / 2; 
 
         // set the contrast to the mid supported value 
         _videoprocamp.Contrast = (_videoprocamp.ContrastInfo.Max - _videoprocamp.ContrastInfo.Min) / 2; 
 
         // set the gain to the maximum supported value 
         _videoprocamp.Gain = _videoprocamp.GainInfo.Max; 
 
         // set the gamma to the maximum supported value 
         _videoprocamp.Gamma = _videoprocamp.GammaInfo.Max; 
 
         // set the hue to the maximum supported value 
         _videoprocamp.Hue = _videoprocamp.HueInfo.Max; 
 
         // 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:\LEADTOOLS23\Media"; 
}

Requirements

Target Platforms

Reference

VideoProcAmp Class

VideoProcAmp Members

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Help Version 23.0.2024.2.29

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies