Mask Rescaler Script

This script is designed to scale the coordinates of a mask when the resolution of the camera is changed. It adjusts the mask coordinates to fit a new resolution based on the old resolution and the scaling factors.

Features

Accepts user input for mask coordinates, old resolution, and new resolution.
Calculates the scaling factors based on the resolutions and applies them to the mask coordinates.
Displays the scaled mask coordinates.
Optionally copies the scaled mask to the clipboard, making it easy to use in your configuration.

Prerequisites

This script requires the following tools:

bash: The script is written in bash and should run in any bash-compatible shell.
xclip (Linux), xsel (Linux), pbcopy (macOS), or clip (Windows) for clipboard functionality.

You can install the clipboard tools with the following commands:

Linux:

Install xclip:
```
sudo apt install xclip
```
Or install xsel:
```
sudo apt install xsel
```

macOS:

pbcopy is pre-installed, so no installation is needed.

Windows:

Use Git Bash, WSL, or Cygwin for Unix-like commands, including printf and echo -n.
Alternatively, if using Windows command prompt (cmd), clip should be available.

Usage

Run the script:
```
./mask_rescaler.sh
```

Provide input when prompted:

The script will ask for the mask coordinates (comma-separated), the old resolution (default: 1280,720), and the new resolution (default: 640,360).

Example input:

Enter the mask (comma-separated values): 682,98,716,284,469,284,442,103
Enter the old resolution (width,height) [1280,720]: 1280,720
Enter the new resolution (width,height) [640,360]: 640,360

Result:
- The script will calculate the scaled mask and display it in the terminal.
- The scaled mask is also copied to the clipboard, ready to be pasted into your Frigate or other video surveillance configuration.

Example Output

Enter the mask (comma-separated values): 682,98,716,284,469,284,442,103
Enter the old resolution (width,height) [1280,720]: 1280,720
Enter the new resolution (width,height) [640,360]: 640,360
Scaled mask:
341,49,358,142,234,142,221,51
Scaled mask copied to clipboard!

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