> This page is for version Dev.
> For other versions, use one of these documentation indexes:
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> - Dev: https://docs.nvidia.com/vss/dev/llms.txt

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/vss/llms.txt.
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# Calibration

Camera calibration is an essential step to enable using cameras as sensors for analytics in our multi-camera tracking workflows.
It involves determining the projection matrix (combined intrinsic and extrinsic parameters) of the camera,
which is necessary for both advanced 3D object detection as well as the spatial understanding of the detected objects.
The camera calibration result is presented in a JSON file following a pre-defined schema which is used in multiple modules within the system.
Below, we describe the pre-defined schema of the calibration file, the provided tools for their supported use cases
and the fundamentals / steps to be used as reference when calibrating any of your own cameras manually for multi-camera tracking use cases.