# Watec Camera Viewer (Browser version) Operation Manual

## 1. Overview

This tool is a browser-based viewer that uses WebRTC to preview video and adjust image quality for Watec USB cameras connected to a PC. No application installation is required.

All video and still image data captured by this viewer are saved locally on the user's PC and are not transmitted to any external server.

## 2. Verified Operating Systems

- Windows 10 / 11
- macOS 26.1 Tahoe (video preview only; UVC controls are limited)
- Linux (Ubuntu 24.04 LTS)

### Unsupported Operating Systems

- Android
- iOS

## 3. Recommended Browsers

- Google Chrome
- Microsoft Edge

## 4. How to Launch

### 4.1 Camera Permission Screen

When launching the viewer for the first time, the browser will request permission to access the camera.

- Click [Allow] to proceed
- If [Block] is selected, video will not be displayed

Even when opening the HTML file locally, camera permission is required due to WebRTC specifications.

## 5. Video Preview

### 5.1 Device Settings

1. Confirm that the camera you want to preview appears in the camera list
2. Select the resolution (e.g. 1920 × 1080)
3. Set the frame rate as required
4. Click [Start Preview]
5. If prompted again, click [Allow] to grant camera access

### 5.2 Live Preview

Once preview starts, the real-time video will be displayed on the left side of the screen.

## 6. Image Quality Adjustment (UVC)

### 6.1 Image Adjustment Panel

On supported browsers, the following image parameters can be adjusted in real time:

- Exposure
- Gain
- White Balance
- Brightness
- Contrast
- Saturation
- Sharpness

If a browser does not support a specific parameter, the corresponding control may be disabled or hidden.

## 7. Recording and Still Images

### 7.1 Control Buttons

While preview is active, buttons for recording and still image capture are displayed in the device settings panel.

Button | Description
--- | ---
Snapshot | Saves the current video frame as a still image.
Start Recording | Starts video recording. The button display changes during recording.
Stop Recording | Stops recording and saves the video file.

Recording and snapshot functions require browser support for the MediaRecorder API.

### 7.2 Saving Still Images

- Format: PNG
- Save location: Browser default download folder
- Example filename: `snapshot_2025-01-01_12-34-56.png`

The resolution of still images depends on the preview resolution.

### 7.3 Video Recording

- Format: MP4
- Save location: Browser default download folder
- Example filename: `record_2025-01-01_12-45-00.mp4`

### 7.4 Notes on Recording

- CPU usage may increase during recording
- High resolution or high frame rate settings may cause recording to stop
- Maximum recording duration depends on browser and PC performance

All recorded videos and still images are saved locally and are not uploaded to any external server.

## 8. Troubleshooting

Issue | Cause | Solution
--- | --- | ---
Camera does not appear in the list | Camera is not connected or not recognized by the OS | Check the USB connection and verify device recognition in the OS
No video is displayed | Camera access is not permitted | Change camera permission to “Allow” in browser settings
Resolution cannot be selected | The camera does not support the selected resolution | Select a resolution supported by the camera
Image quality controls are unavailable | The camera does not support UVC controls | Only supported parameters can be adjusted
Recording cannot be started | Unsupported browser or preview not started | Use the latest Chrome / Edge / Safari and start preview first
MP4 file is not saved after recording stops | Download blocked or high system load | Check browser download settings or lower resolution/frame rate

## 9. Disclaimer

This software and this guide are provided on an “as is” basis.

- No responsibility is assumed for any direct or indirect damages resulting from the use or inability to use this software.
- No guarantee is provided regarding the accuracy or completeness of captured video or image data.
- Operation depends on the OS, browser, USB camera, and system configuration, and is not guaranteed in all environments.
- Contents of this guide are subject to change without notice.

By using this software, you are deemed to have agreed to the above disclaimer.

## 10. Version Information

Item | Details
--- | ---
Software Name | Watec Camera Viewer (Browser version)
Version | v1.00
Release | Initial release