Remove duplicate of object detected

[Cheukting]

Is your feature request related to a problem? Please describe.
Now the object detection algorithm will throw multiple of the object if it has been detected more than once in a picture.

Describe the solution you'd like
Make the like of objected unique

Describe alternatives you've considered
We will change the model to an auto caption one eventually but right now we can apply this quick fix

Additional context
e.g. "Soapie sees kite, kite, person, person, kite, person, person" should be "Soapie sees kite, person"

[daeus]

Idea: what about Soapie sees 3 kites and 4 people?

[Cheukting]

Good idea!