Optical zoom control on EH6300 (C#)

Programming Questions C-style API
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1

Hi,
I’ve used the CSMovie2Recorder tutorial program lately, and adjusted to my needs for a Sony EH6300 (ethernet). It works prefectly!
Only point is that I’d need to control the Optical Zoom from a scrollBar I’ve added, but I’m still not sure what command to use… since the function m_cvDisplay.SetDisplayZoomEx() is for digital zoom in my case.
Thanks for your help.

2

Ok, in addition. The management of the Zoom Control in CVB is made of two statements:

  • first have to set control mode (ZoomControlMode) to “ZoomTarget”
  • then can manage zoom position (ZoomPositionTarget) from an integer

Here is an extract of the GenICam Settings File *.gcs file given by CVB Manager when trying to finding the function :

Cust::ZoomControlMode = "ZoomTarget"
Cust::ZoomFactor = "1"
Cust::ZoomPosition = "0"
Cust::ZoomPositionTarget = "152"     (<-- here is to set zoom position)
Cust::ZoomPlusSpeed = "0"
Cust::ZoomMinusSpeed = "0"
Cust::ZoomDEnable = "1"

I’m still looking to find those properties, but honestly, am getting lost…

3

Hi trob,

thank you very much for your question. You can access any camera parameter value which is read/writeable via the INodeMap interface. In CVB all parameters are within the NodeMap, one parameter is a Node. So on the Common Vision Blox Manual you can find according programming information.

You may also find information in following link, where you can find a sample code:
CVB User Guide NodeMap

// Check if INodemap interface is available
if (CanNodeMapHandle((IMG)m_cvImg.GetImage()))
{
  NODEMAP nodeMap = nullptr;
  // Get NodeMap from Camera
  cvbres_t result = NMHGetNodeMap(reinterpret_cast<IMG>(m_cvImg.GetImage()), nodeMap);
  if (result >= 0)
  {
    NODE exposureTimeNode = nullptr;
    result = NMGetNode(nodeMap, "ExposureTime", exposureTimeNode);
    if (result >= 0)
    {
      // Set the Exposuretime to 20ms
      result = NSetAsFloat(exposureTimeNode, 20000);
 
      ReleaseObject(exposureTimeNode);
    }
 
    ReleaseObject(nodeMap);
  }
 
  // TODO result < 0 => error
}

I hope, this answers your question.

Regards,
Bea

4

I also was nearly finished with the C# implementation when @Diverl posted her answer. :slight_smile: So I assume you use a Windows.Forms dialog with an :cvb: Image ActiveX Control m_cvImage:

using (var nodeMap = NodeMapExtensions.NodeMapFromDriverImage(m_cvImage.Image))
{
  using (var zoomControlMode = nodeMap.GetNode("ZoomControlMode"))
  {
    zoomControlMode.SetValue("ZoomTarget");
  }
  using (var zoomTarget = nodeMap.GetNode("ZoomPositionTarget")
  {
    zoomTarget.SetValue(42);
  }
}

To be able to use that you need these two extension classes which need the iCVCImg.dll, iCVCDriver.dll and iCVGenApi.dll from %CVB%\Lib\Net as references:

using Cvb
using static Cvb.Driver.INodeMapHandle
using static Cvb.GenApi
using static Cvb.Image

static class NodeMapExtensions
{
  public static SharedNodeMap NodeMapFromDriverImage(IMG driver)
  {
    SharedNodeMap nodeMap;
    int result = NMHGetNodeMap(driver, out nodeMap);
    if (result < 0)
      throw new Exception("CVB error #" + (result & 0x7FFFFFFF));
    return nodeMap;
  }

  public static SharedNode GetNode(this SharedNodeMap nodeMap, string nodeName)
  {
    SharedNode node;
    int result = NMGetNode(nodeMap, nodeName, out node);
    if (result < 0)
      throw new Exception("CVB error #" + (result & 0x7FFFFFFF));
    return node;
  }
}

static class NodeExtensions
{
  public static void SetValue(this SharedNode node, string value)
  {
    int result = NSetAsString(node, value);
    if (result < 0)
      throw new Exception("CVB error #" + (result & 0x7FFFFFFF));
   }
	
  public static void GetValue(this SharedNode node, out string value)
  {
    int result = NGetAsString(node, out value);
    if (result < 0)
      throw new Exception("CVB error #" + (result & 0x7FFFFFFF));
  }

  public static void SetValue(this SharedNode node, long value)
  {
    int result = NSetAsInteger(node, value);
    if (result < 0)
      throw new Exception("CVB error #" + (result & 0x7FFFFFFF));
  }

  public static void GetValue(this SharedNode node, out long value)
  {
    int result = NGetAsInteger(node, out value);
    if (result < 0)
      throw new Exception("CVB error #" + (result & 0x7FFFFFFF));
   }
}
2 Likes
5

Many thanks for your help. I’ll try it right away.