Camera control and PTZ in Video Capture SDK .Net

Using Camera Control API you can set the following camera parameters (camera can support only some of them): Pan, Tilt, Roll, Zoom, Exposure, Iris, Focus.

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Camera Control API should be used with started camera preview or capture.

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In this tutorial we'll use Zoom command.

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On form we using several checkboxes, labels and slider control. You can check Main Demo source code.

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1. Read default values and command ranges.

int max;
int defaultValue;
int min;
int step;
VFCameraControlFlags flags;

if (VideoCapture1.Video_CaptureDevice_CameraControl_GetRange(
    VFCameraControlProperty.Zoom, out min, out max, out step, out defaultValue, out flags))
{
    // set slider range
    tbCCZoom.Minimum = min;
    tbCCZoom.Maximum = max;
    tbCCZoom.SmallChange = step;
    tbCCZoom.Value = defaultValue;

    // set min, max and current values on labels
    lbCCZoomMin.Text = "Min: " + Convert.ToString(min);
    lbCCZoomMax.Text = "Max: " + Convert.ToString(max);
    lbCCZoomCurrent.Text = "Current: " + Convert.ToString(defaultValue);

    // set command checkboxes
    cbCCZoomManual.Checked = (flags & VFCameraControlFlags.Manual) == VFCameraControlFlags.Manual;
    cbCCZoomAuto.Checked = (flags & VFCameraControlFlags.Auto) == VFCameraControlFlags.Auto;
    cbCCZoomRelative.Checked = (flags & VFCameraControlFlags.Relative) == VFCameraControlFlags.Relative;
}

If Auto flag set all other flags and values will be ignored.

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2. Apply value set on slider (Auto checkbox should be disabled to set manual value or enabled to set camera default value).

VFCameraControlFlags flags = VFCameraControlFlags.None;

if (cbCCZoomManual.Checked)
{
    flags = flags | VFCameraControlFlags.Manual;
}

if (cbCCZoomAuto.Checked)
{
    flags = flags | VFCameraControlFlags.Auto;
}

if (cbCCZoomRelative.Checked)
{
    flags = flags | VFCameraControlFlags.Relative;
}

VideoCapture1.Video_CaptureDevice_CameraControl_Set(VFCameraControlProperty.Zoom, tbCCZoom.Value, flags);