How to center bounding box using 3D move without changing zoom with the Dahua HTTP API.

[PTZControllerSA]

Hi,

I’m controlling a Dahua PTZ through the HTTP CGI interface.


The moveDirectly command works well for centering a bounding box from image coordinates, but it always performs a zoom-in so the selected rectangle fills the frame.


I need to keep the current zoom level exactly as it is, just pan/tilt to center a given region, no zoom change at all.


Here’s what I’ve tried:

• moveRelatively → works, but hard to compute the correct normalized deltas to precisely center the box across different zoom levels.
• moveDirectly → centers correctly, but always changes zoom (even when I restore the previous zoom with moveAbsolutely, it’s a clunky jump and I'd like to do this in one go).

Question:
Is there any Dahua API parameter, hidden flag, or alternative CGI endpoint that lets me:

1. Specify a point on the current view
2. Have the camera only pan/tilt to center it
3. Leave zoom completely untouched

If that’s impossible in Dahua’s API, what’s the cleanest workaround?

 

[PTZControllerSA]

Hi All,

For those who are interested, I actually found a perfect solution.
You give the camera a 0x0 box to center.
Then the camera moves to exactly that spot without zooming in.