Black Screen Detection

BSD Capture: A transition on this event port causes the image from the BSD Source port to be transmitted from the BSD Snapshot port. The captured image is not necessarily a black screen.

BSD Enable: When this Boolean port is true, black screen detection is active. When false, the transform does not transmit any output.

BSD Source: This MxV Image port accepts images from a camera or similar Transform. To connect with a NI Vision Image Signal, use an image conversion Transform to convert the image type.

BSD Snapshot: When a transition is received on the BSD Capture port, the current image is transmitted from this MxV Image port.

BSD Detect: This Boolean port is set to true when a black screen is detected.

Set the properties on the Black Screen Detector Transform as shown here:

Black Screen Detection Transform Properties

The Brightness Threshold is used to determine if a screen is considered black. A black screen is defined as an image with 0% bright pixels.

1.Click the Device Test verb to see the current image.

2.Select the camera from the drop-down list under the image.

Note: If the camera is not set up correctly, it will display Camera Not Ready.

3.Point the camera at an example of a black screen.

4.Use the slider to find the Brightness Threshold that produces 0% bright pixels.

5.Enter that value in the Brightness Threshold property.

When the Transform is used with a USB Webcam (Generic) Transform, the Webcam properties should be set as shown here:

Properties on the USB WebCam (Generic) Transform