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With Node-RED you can add text to Hikvision camera. A very useful example would be adding the temperature outside to the camera image.
You will need:
- Hikvision camera
- Node-RED
Step 1: Camera configuration
Open IVMS, right-click on a camera and “Remote Configuration”. Click on “Image” then “Video Display”. You will find there a “text overlay” list. Enable the first position, add a random text and drag it on the image to the desired location.
Step 2: Send data from Node-RED
You will need only 2 nodes: a function node and a http request node.
Function node: we will form here the body of the request.
var text = msg.payload;
msg.payload = '<TextOverlayList><TextOverlay><id>1</id> <enabled>true</enabled><displayText>Temp: ' + text + '°C</displayText></TextOverlay></TextOverlayList>'
return msg;HTTP request node settings:
- Method: PUT
- URL: http://camera-ip/ISAPI/System/Video/inputs/channels/1/overlays/text
- Use basic authentication: enter user and password for your camera
In the example above the function gets data from a temperature sensor and adds it to the camera. You can change the text between <displayText> and </displayText> to whatever you want.
If it doesn’t work check the comments here to enable basic authentication.
