What it does
Unsharp masking is a sharpening filter applied to images after capture. Despite the name, it increases perceived sharpness — it works by detecting edges in the image and boosting contrast along them, making fine detail appear crisper and clearer. If images look soft or muddy, enabling or tuning this filter is the first thing to try.
How to open the Image Calibrator
Muntra Capture runs as a system tray application on Windows. The Image Calibrator is only accessible once at least one image has been captured on the device you want to configure.
- Click the Muntra icon in the Windows system tray.
- In the menu that appears, click Captured images, then click the name of the sensor you want to configure. (This submenu only appears after the first image has been taken.)
- A window titled Captured images: [device name] opens, showing recent images from that device.
- Select an image from the list.
- Click Configure device settings. The Image Calibrator opens, titled Image Calibrator: [device name].
Unsharp masking controls
The unsharp masking controls are in the settings panel on the left side of the Image Calibrator. Tick the Unsharp masking checkbox to enable the filter; the three sliders underneath become active.
| Parameter | Display range | What it controls |
|---|
| Amount | 1.0 – 2.5 | Strength of the sharpening effect. Higher values produce a more pronounced result. Default: 1.7 |
| Radius | 2.0 – 5.0 | Size of the area around each edge that gets enhanced. Larger values affect broader edge regions. Default: 3.5 |
| Threshold | 0 – 1000 | Minimum contrast difference required before sharpening is applied. Higher values protect flat areas (like soft tissue) from being sharpened unnecessarily. Default: 0 |
How to adjust and save the settings
- Tick Unsharp masking to enable the filter.
- Adjust the Amount, Radius, and Threshold sliders. The current value is shown next to each slider and updates as you drag.
- Click Save to apply the filter to the preview. The processed image appears in the After panel; the original image stays in the Before panel. Settings are not yet saved permanently at this point.
- When satisfied with the result, click Save && apply to device to persist the settings for this specific device. Future captures from this device will use these settings automatically.
- Optionally click Send to Muntra to resend the processed image back to the open patient record immediately.
Settings are saved per device. If no per-device settings exist, the calibrator falls back to global settings that apply to all devices.
Troubleshooting muddy images
- Start with Amount 1.7, Radius 3.5, Threshold 0 and click Save to preview. Adjust from there.
- If the image looks over-sharpened or has a halo effect around edges, reduce Amount or increase Threshold.
- If sharpening looks uneven across image types, check whether per-device settings have been saved for a different device and are overriding the global configuration.
