Configuring Fish Eye Correction – Sandbox_2025

Configuring Fisheye Correction

If you are using cameras with fisheye lenses, you can use the Fisheye Lens Correction option to correct distortion to the resulting image.

Synergy has two ways of dewarping fisheye images. The original version is still retained for legacy use, but there is also a version available that has gradient zoom capability. This version also allows you to pan, tilt and zoom within recorded video, and set preset positions.

You must configure your Synergy system to use either de-warping system.

If you are using Synx HD fisheye cameras, a further level of configuration is available. For more details, see Configuring Fisheye Correction for Synx HD Cameras on page 1.

Fisheye Dewarping including Gradient Zoom

To select this option, go to Setup-> System Setup->Press for Advanced Configuration->System Properties->Central Configuration Settings.

Under the GUI Settings tab, set fishEyeV2 to "true".

Click the Fisheye Lens Correction icon on the Video menu.

The Configure Fisheye Correction dialog appears.

Two screens display in the Video tab playback window.

The right screen displays the image from the fisheye camera within a thin green oval. The green oval defines the area of the image in the left screen before any adjustment.

Using the slider controls, adjust the green outline to improve the image in the left screen.

Field of view X - This slider stretches or shrinks the image horizontally. This setting is useful if the left-hand image appears too wide.

Field of view Y - This slider stretches or shrinks the image vertically. This setting is useful if the left-hand image appears too tall.

Quality - This slider increases or decreases the quality of the image, especially around the edges. Note that a higher quality image uses more of the PC's resources.

Depth - This slider adjusts the Z axis by which the center image is stretched. Adjusting this increases or decreases the amount of apparent curvature from the center of the screen.

Virtual Cameras

This version of fisheye dewarping also allows the use of virtual cameras. A virtual camera is not a physical camera, but is a pre-defined view from a fisheye camera.

For example, you could set up four virtual cameras, each showing a static view of a different corner of a room. Each of these virtual cameras would be a preset view derived from a dewarped image from a single fisheye camera placed in the middle of the room.

To add a virtual camera, select Add Virtual Camera from the Camera Control section under Operations.

Populate the Id, Name and Description fields. The Source Camera information will be pre-populated with information from the currently selected camera.

Click OK.

The virtual camera now appears in your camera list, and can be selected like any other camera.

Fisheye Dewarping - Original Version

To select this option, go to Setup-> System Setup->Press for Advanced Configuration->System Properties->Central Configuration Settings.

Under the GUI Settings tab, set fishEyeV2 to "false".

Click the Fisheye Lens Correction icon on the Video menu.

The Configure Fisheye Correction dialog appears.

Two screens display in the Video tab playback window.

The right-hand screen displays the image from the fisheye camera with two sets of white outlines. For best results, the entire image from the camera should be visible on the screen. If it is not, use the camera’s software to change its settings.

The small outline defines the area of the image in the left screen before any pan, tilt, or zoom.

Use the View Port Size slider to adjust the size of the initial view port. In the left screen, you can use the digital zoom control to adjust the pan, tilt, and zoom in the camera image.

Using the slider controls, adjust the outer white outlines to match the edges of the uncorrected image.

Configuring Fisheye Correction for Synx HD Cameras

If you are using Synx HD fisheye cameras, a different dialog box is available, allowing you to select front end dewarping options. This can be accessed from the Customize View->Synx Fisheye tab. Drag and drop this tab down onto the screen.

To enable this, you must be using a Synx HD camera type that has the setting Synx HD Hardware Fisheye selected on the Advanced tab page for the camera type.

Select the Region, or window in which the camera is viewed. For example, if you have a quad view, region 1 would be top left, region 2 top right and so on.

Select the correct dewarping Mode, for example, with a horizontal layout.

Use the Mounting setting to define whether it is a wall or ceiling-mounted view.

The dewarping options for wall-mounted fisheye cameras are: overview, 180, 180_2PTZ, none.

The dewarping options for ceiling-mounted fisheye cameras are: overview, ptz, 360, 4ptz, none.

Use your mouse to control the red button. This moves the view around the image, as if it were a camera panning. The slider on the right-hand side is used to zoom in and out.

Controls at the bottom allow you to reverse the direction of the pan, tilt and zoom functions.

To set a Preset, zoom, pan and tilt the image to your chosen view. Select a preset number from the drop-down menu and click Set.

To view the Preset, select a preset number from the drop-down menu and click GoTo.

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