Welcome! This user manual will guide you through using and configuring the Metrici QR Code Recognition application. This software automatically recognizes QR codes from video streams and can send this information to servers for further processing, such as access control, inventory tracking, or document processing.

Table of Contents

• 1. Overview
• 2. Main Window
• 3. Getting Started
• 4. Video Sources
• 5. Detection Window
• 6. QR Recognition Engine Settings- Working mode and trigger
• 7. External Trigger
• 8. QR Code Detection Settings
• 9. Reporting and Check Actions
• 10. Door Opening and Door Light
• 11. GPS Integration
• 12. Weight Scale Integration
• 13. Radar Integration
• 14. Live View
• 15. Settings Management
• 16. INI Configuration File

1. Overview

The Metrici QR Code Recognizer system is designed to:

• Connect to video cameras - Supports IP cameras, RTSP streams, HTTP video streams, and many other video sources
• Detect QR codes - Automatically identifies QR codes from the video feed
• Process and record codes - Saves recognized QR codes with timestamps, images, and location data
• Integrate with external systems - Can send code data to servers for access control, inventory tracking, or verification
• Work with additional sensors - Can connect to GPS devices, weight scales, and radar sensors for enhanced tracking

2. Main Window

The main window is divided into several sections:

2.1 Video Display Area

The left side of the window displays:

• Main Input Stream - Shows the video feed from your primary camera
• Companion Stream - (Optional) Shows video from a second camera for additional coverage

Each video display shows:

• Connection status (Connected, Disconnected, Connecting)
• Stream type and address
• Frame rate (FPS)
• Video resolution

2.2 QR Code Information Panel

The right side displays:

• Last Detected Code - Shows the most recently recognized QR code
• Code Table - A list of all detected QR codes with timestamps and confidence scores
• Statistics - Frame counts and processing rates

2.3 Control Buttons

• Settings - Opens the configuration window to customize all application settings
• About - Shows version information and license details
• Min/Max - Toggles between fullscreen and windowed mode
• Quit - Closes the application

3. Getting Started

3.1 Initial Setup

1. Connect your camera - Ensure your IP camera is connected to the network and functioning
2. Launch the application - Set it in Foregreound with watchdog to iniate settings
3. Open settings - Click the Settings button
4. Configure video source - Go to the "Input Stream" section and select your camera type
5. IP Address: Enter the camera's IP address or hostname (without http://)
6. Port: Enter the HTTP port (default HTTP is usually 80)-other protocols have different ports
7. Write username and password for the camera
8. Limit FPS: Set to 0 for unlimited, or specify a maximum frame rate
9. Save settings - Click Save to apply your configuration
10. Test the connection - The video feed should appear in the main window

3.2 First Time Configuration

For optimal performance, follow these steps:

1. Adjust the Detection Window to cover only the area where QR codes will appear
2. Set the QR Recognition Engine Working Mode based on your needs
3. Configure Reporting URLs if you want to send code data to a server
4. Set up Barrier Control if you need automatic gate opening based on QR codes

4. Video Sources

The application supports many types of video sources. You need to configure both the Input Stream (main camera) and optionally a Companion Stream (secondary camera).

4.1 Input Stream Configuration

Stream Type

Select the type of video stream from your camera. If you don't have a specific supported brand, just choose Generic. The application supports:

Type	Description
HTTP ACTi MJPEG	ACTi cameras using MJPEG over HTTP
RTSP ACTi H264	ACTi cameras using H264 over RTSP
HTTP Android MJPEG	Android-based cameras
HTTP Arecont MJPEG	Arecont Vision cameras
HTTP Axis MJPEG	Axis cameras using MJPEG
RTSP Axis MJPEG	Axis cameras using RTSP with MJPEG
RTSP Axis H264	Axis cameras using RTSP with H264
RTSP Bosch MJPEG	Bosch cameras using MJPEG
RTSP Bosch H264	Bosch cameras using H264
HTTP Dahua MJPEG	Dahua cameras using MJPEG
HTTP Diviotec MJPEG	Diviotec cameras
RTSP Diviotec H264	Diviotec cameras using H264
HTTP Generic MJPEG	Generic MJPEG cameras
RTSP Generic MJPEG	Generic RTSP MJPEG streams
RTSP Generic H264	Generic RTSP H264 streams
HTTP Hikvision MJPEG	Hikvision cameras using MJPEG
RTSP Hikvision H264	Hikvision cameras using H264
HTTP Mobotix MJPEG	Mobotix cameras using MJPEG
HTTP Mobotix MxPEG	Mobotix cameras using their MxPEG format
RTSP Mobotix H264	Mobotix cameras using H264
RTSP Mobotix MOVE H264	Mobotix MOVE cameras
HTTP Novus MJPEG	Novus cameras
RTSP Novus H264	Novus cameras using H264
RTSP Pelco MJPEG	Pelco cameras
ROSEEEK RAW	ROSEek camera raw stream
HTTP Samsung MJPEG	Samsung cameras
RTSP Samsung H264	Samsung cameras using H264
HTTP Sony MJPEG	Sony cameras
RTSP Sony H264	Sony cameras using H264
RTSP Uniview H264	Uniview cameras
HTTP Vivotek MJPEG	Vivotek cameras
HTTP VLC MJPEG	VLC media server streams

Stream Address

Enter the network address of your camera. This could be:

• IP address - e.g., 192.168.1.100
• Hostname - e.g., camera.warehouse.example.com
• Full URL - e.g., http://192.168.1.100/video.cgi

TCP Port

The network port number your camera uses. Common defaults:

• HTTP streams - usually port 80
• RTSP streams - usually port 554
• Custom cameras - check your camera documentation

Username and Password

If your camera requires authentication, enter the credentials here. Leave blank if your camera is open access.

FPS Limit

Limits the number of frames processed per second. Lower values reduce CPU usage but may miss fast-moving QR codes. Recommended values:

4.2 Companion Stream

The companion stream provides a second video camera view. This is useful when:

• You need multiple angles of the same QR code
• You want to cover a larger area than one camera can see

Configuration options are identical to the Input Stream.

5. Detection Window

The detection window defines the specific area within the video frame where the application will look for QR codes. This optimization :

• Improves accuracy - Reduces false detections from non-code areas
• Increases speed - Smaller area = faster processing
• Reduces CPU usage - Less area to scan

5.1 Detection Window Active

Enable or disable the detection window. When disabled, the entire video frame is scanned for QR codes.

• Enabled (checked) - Only scan within the defined window
• Disabled (unchecked) - Scan the entire video frame

5.2 Window Position and Size

Setting	Description
Origin X (origx)	Horizontal starting position of the detection window (left edge)
Origin Y (origy)	Vertical starting position of the detection window (top edge)
Resolution X (resx)	Width of the detection window in pixels
Resolution Y (resy)	Height of the detection window in pixels

5.3 Items Direction

Set the direction of item movement (0-360 degrees). This is used for:

• Statistical analysis of item flow
• Event triggering (e.g., trigger when items are entering vs. leaving)
• Filtering codes based on direction

The direction is set using a dial control. Arrange the arrow accordingly:

• Coming - Items going in the set direction are coming
• Leaving Items going in the set direction are leaving
• Useful to use to filter events on the Interface when needed or to keep track of items inside

6. QR Recognition Engine Settings- Working mode and trigger

The QR Recognition Engine settings control how the application processes video to find and read QR codes.

6.1 Working Mode

Mode	Description	Use Case
Continuous	Constantly analyzes every frame for QR codes	High-volume scanning, no external trigger available
Started by Trigger	Only analyzes when triggered by external signal	Lower CPU usage, controlled capture timing, lower false positives

Recommendation: Use "Continuous" mode for most installations. Use "Started by Trigger" mode when you have external sensors and want to save CPU resources or precisely control when codes are captured.

7. External Trigger

An external trigger allows sensors or devices to tell the application when to capture QR codes. This is useful when:

• You have item detection sensors (photoelectric sensors, infrared beams)
• You want precise control over when codes are captured
• You want to save CPU resources by only processing when needed

Trigger Type

Type	Description
None	No external trigger (uses continuous mode)
Barionet 50 I1-I4	Barionet 50 device with input 1, 2, 3, or 4
Metrici Virtual	Virtual trigger via network connection

Trigger Seconds

The duration (in seconds) the detection engine remains active after being activated. Set this based on how long items take to pass through the detection area.

8. QR Code Detection Settings

8.1 Same Code Delay

After a QR code is detected, the application waits this many seconds before detecting the same code again. This prevents:

• Duplicate entries for the same code
• Multiple triggering for one item
• Overloaded reporting systems

Recommended value: depending on item flow speed

8.2 Minimum Code Length

The minimum number of pixels a recognized QR code must contain to be considered valid. This filters out false detections.

8.3 Maximum Code Length

The maximum number of pixels a recognized code can have.

8.4 Single Code Mode

When enabled, the application will only process and report the first QR code found in each frame. When disabled, all detected QR codes in a frame are processed.

• Enabled - Faster processing, best for single-item scanning
• Disabled - Captures all codes, best for multi-code or high-density areas

9. Reporting and Check Action

The application can send recognized QR code information to external servers for processing, validation, or storage.

9.1 Reporting URL

The web address where recognized code data is sent. The server typically stores this information in a database.

Format: http://your-server.com/io/qr/reporting_event.php

9.2 Check Action URL

The web address used to check recognized codes against a database. The server can respond with instructions such as:

• Grant access (open barrier)
• Deny access (keep barrier closed)
• Log only (no action)
• Trigger alert

Format: http://your-server.com/io/qr/check_action_event.php

9.3 Check Action Authentication Key

A security key facilitates communication between egines and database. It is to be obtained from Metrici Interface when setting the location and cameras, being generated by Metrici.

9.4 Send Trigger

The application can send a network trigger when a QR code is recognized:

Setting	Description
Trigger Address	IP address or hostname of the device to trigger
Trigger UDP Port	Network port on the target device

Common uses include triggering external systems like barrier controllers, displays, sorting systems, or alarm systems.Or another Metrici detection engine.

10. Door Opening and Door Light

The application can automatically control two separate doors/barriers/gates etc based on QR code validation results.

10.1 First Device

Setting	Description
Open Door URL	HTTP address to send a command that opens the first device
Close Door URL	HTTP address to send a command that closes the first device
Open-Close Delay	Time (seconds) between opening and automatically closing the barrier

10.2 Door Light ON URL

Same settings as the first one, for a second gate or barrier at the same location.

Use cases for dual barriers:

• Entry and exit points
• Multiple security checkpoints
• Staging area control
Safety Warning: When setting automatic close delays, ensure sufficient time for items to pass through. A delay that is too short could cause damage or accidents.

11. GPS Integration

The application can receive GPS coordinates from a connected GPS device. This is useful for:

• Mobile scanning installations
• Recording the exact location where each code was scanned
• Verifying the location of recorded scans

11.1 GPS Status

Shows the current status of the GPS connection:

• Unconnected - GPS device not connected or not detected
• Error - GPS device connected but not functioning
• Low Signal - GPS signal weak, position may be inaccurate
• Good Signal - GPS working properly with accurate position

11.2 Latitude and Longitude

Shows the current GPS coordinates in decimal degrees format:

• Latitude - North/South position (-90 to +90 degrees)
• Longitude - East/West position (-180 to +180 degrees)

12. Weight Scale Integration

The application can integrate with industrial weight scales. When connected, the weight of the item is recorded along with the QR code.

12.1 Weight Scale Type

Type	Description
None	No weight scale connected
Barix Cantar-I30	Barix Cantar-I30 weight scale device

12.2 Weight Scale Address

The network address (IP or hostname) of the weight scale device.

12.3 Weight Scale TCP Port

The network port the weight scale uses for communication (default varies by device).

13. Radar Integration

The application can integrate with radar speed sensors to capture item speed along with QR codes.

13.1 Radar Type

Type	Description
None	No radar connected
Metrici Observer Radar	Metrici radar device naturally integrated with the detection engines

13.2 Radar Address

The network address (IP or hostname) of the radar device.

13.3 Radar TCP Port

The network port the radar uses for communication.

Use Case: Weight scales and radar sensors are commonly used together at loading docks, quality control stations, or sorting facilities, or on production sites.

14. Live View

The live view feature sends processed video frames to a web server, allowing real-time viewing through a web browser.

14.1 Live View Active

Enable or disable the live view feature:

• Enabled - Frames are sent to the live view server
• Disabled - Live view is not active

14.2 Live View URL

The web address where frames should be sent:

Format: http://localhost/io/qr/live_view.php

15. Settings Management

15.1 Saving Settings

To save your configuration:

1. Click the Settings button in the main window
2. Configure all desired settings in the various sections
3. Click Save to apply changes
4. The settings are saved to a configuration file

15.2 Canceling Changes

If you make changes you don't want to keep:

1. Click Cancel in the settings window
2. Changes are discarded
3. Previous settings remain active

15.3 Auto-Reload on File Change

The application monitors the settings file for external changes. If you modify the settings file directly (using a text editor), the application will automatically reload the new settings.

16. INI Configuration File

16.1 Overview

The application stores all its configuration settings in an INI-format configuration file. This file contains all the parameters that control how the application operates, from video source connections to reporting URLs. The INI file serves as both a persistent storage for settings and a convenient way to back up, transfer, or modify configurations across different installations.

16.2 File Location

The configuration file is typically named app_id.ini and is located in the same directory as the application executable.

16.3 File Structure

The INI file uses a simple text-based format with sections, keys, and values. The file is divided into sections enclosed in square brackets, with each section containing multiple key-value pairs. The general format is:

[SectionName]
key1=value1
key2=value2
key3=value3

Tip: The application can use multiple configuration files (0.ini, 1.ini, o.ini) for different applications .

16.4 General Settings

These settings control the core operation mode and basic application behavior.

Setting	Description	Example
input_stream_type	Type of video stream for the main camera (see Stream Types table)	17
input_stream_address	Network address or hostname of the main camera	192.168.1.60
input_stream_tcp_port	TCP port for the video stream connection	554
input_stream_username	Username for camera authentication (leave blank if not required)	admin
input_stream_password	Password for camera authentication (leave blank if not required)	secret123
input_stream_fps_limit	Maximum frames per second to process (0 = unlimited)	7

16.5 Companion Stream Settings

The companion stream provides a secondary video source for additional coverage or redundancy.

Setting	Description	Example
companion_stream_type	Type of video stream for the companion camera (see Stream Types table)	10
companion_stream_address	Network address or hostname of the companion camera	192.168.1.61
companion_stream_tcp_port	TCP port for the companion video stream	80
companion_stream_username	Username for companion camera authentication	admin
companion_stream_password	Password for companion camera authentication	admin123
companion_stream_resx	Horizontal resolution of companion stream in pixels	640
companion_stream_resy	Vertical resolution of companion stream in pixels	480

16.6 Reporting and Check Action Settings

These settings configure how the application reports recognized QR codes to external servers and receives validation responses.

Setting	Description	Example
reporting_url	URL endpoint for sending recognized QR code data	http://server.com/io/qr/reporting_event.php
reporting_check_action_authkey	Authentication key for reporting requests	TX8343V2
reporting_check_action_id	Station identifier sent with reporting data	7
check_action_url	URL endpoint for checking QR codes against a database	http://server.com/io/qr/check_action_event.php
check_action_min_probability	Minimum confidence threshold (0.0-1.0) for actions	0.6
check_action_send_trigger_address	IP address for sending UDP trigger on detection	192.168.1.100
check_action_send_trigger_udp_port	UDP port for trigger messages	5000

16.7 Barrier Control Settings

These settings control automatic barrier or gate opening based on QR code validation.

Setting	Description	Example
open_barrier_url	HTTP URL to call when opening the first barrier	http://192.168.1.100/outs.cgi?out0=0
open_close_barrier_delay	Seconds to wait before automatically closing barrier	10
close_barrier_url	HTTP URL to call when closing the first barrier	http://192.168.1.100/outs.cgi?out0=1
open_barrier2_url	HTTP URL to call when opening the second barrier	http://192.168.1.101/open.cgi
open_close_barrier2_delay	Seconds to wait before automatically closing barrier 2	15
close_barrier2_url	HTTP URL to call when closing the second barrier	http://192.168.1.101/close.cgi

16.8 QR Code Detection Settings

These settings control how the application detects and processes QR codes.

Setting	Description	Example
same_plate_delay	Seconds to wait before detecting the same code again	10
plate_min_length	Minimum number of pixels for valid QR code	100
plate_max_length	Maximum number of pixels for valid QR code	1000
single_plate_mode	Process only first QR code per frame (0=disabled, 1=enabled)	0
countries	Comma-separated list of expected formats (if applicable)	"RO,BG,DE"

16.9 Detection Window Settings

These settings define the region of interest within the video frame where QR codes will be detected.

Setting	Description	Example
input_stream_window_active	Enable detection window (0=disabled, 1=enabled)	0
input_stream_window_origx	X coordinate of detection window's left edge	300
input_stream_window_origy	Y coordinate of detection window's top edge	224
input_stream_window_resx	Width of detection window in pixels	300
input_stream_window_resy	Height of detection window in pixels	224
input_stream_resx	Horizontal resolution of input video in pixels	1920
input_stream_resy	Vertical resolution of input video in pixels	1080

16.10 Direction and Event Settings

These settings control how the application interprets item movement direction.

Setting	Description	Example
cars_direction	Direction of item movement in degrees (0-360)	36
cars_event_type	Event type filter (1=coming, 2=leaving)	1

16.11 Engine Settings

Settings that control the QR recognition engine operation mode.

Setting	Description	Example
lpr_engine_working_mode	Engine mode (0=continuous, 1=triggered)	0

16.12 External Trigger Settings

Settings for connecting external sensors that trigger QR code capture.

Setting	Description	Example
external_trigger_type	Trigger type (0=none, 1=Barionet, 2=Virtual)	0
external_trigger_seconds	Duration trigger remains active after activation	1

16.13 Weight Scale Settings

Settings for integrating industrial weight scales to record item weight with QR codes.

Setting	Description	Example
weight_scale_type	Device type (0=none, 1=BarixI30)	0
weight_scale_address	Network address of weight scale device	192.168.1.50
weight_scale_tcp_port	TCP port for weight scale communication	10001

16.14 Radar Settings

Settings for integrating radar speed sensors to capture item speed data.

Setting	Description	Example
radar_type	Device type (0=none, 1=Barix )	0
radar_address	Network address of radar device	192.168.1.51
radar_tcp_port	TCP port for radar communication	10002

16.15 Live View Settings

Settings for streaming processed video frames to a web server for remote viewing.

Setting	Description	Example
live_view_active	Enable live view feature (0=disabled, 1=enabled)	1
live_view_url	URL endpoint for sending live view frames	http://server.com/io/qr/live_view.php

16.16 Video Stream Types

The following values are used for the input_stream_type and companion_stream_type settings:

Value	Stream Type
1	HTTP ACTi MJPEG
2	RTSP ACTi H264
3	HTTP Android MJPEG
4	HTTP Arecont MJPEG
5	HTTP Axis MJPEG
6	RTSP Axis MJPEG
7	RTSP Axis H264
8	RTSP Bosch MJPEG
9	RTSP Bosch H264
10	HTTP Dahua MJPEG
11	HTTP Diviotec MJPEG
12	RTSP Diviotec H264
13	HTTP Generic MJPEG
14	RTSP Generic MJPEG
15	RTSP Generic H264
16	HTTP Hikvision MJPEG
17	RTSP Hikvision H264
18	HTTP Mobotix MJPEG
19	HTTP Mobotix MxPEG
20	RTSP Mobotix H264
21	RTSP Mobotix MOVE H264
22	HTTP Novus MJPEG
23	RTSP Novus H264
24	RTSP Pelco MJPEG
25	ROSEek RAW
26	HTTP Samsung MJPEG
27	RTSP Samsung H264
28	HTTP Sony MJPEG
29	RTSP Sony H264
30	RTSP Uniview H264
31	HTTP Vivotek MJPEG
32	HTTP VLC MJPEG

16.17 Example Configuration Files

Basic Setup (o.ini)

[General]
input_stream_type=4
input_stream_address=192.168.11.40
input_stream_tcp_port=80
input_stream_username=admin
input_stream_password=123456
reporting_check_action_authkey=TX8343V2
reporting_check_action_id=7
reporting_url=http://lpr.metrici.ro/io/qr/new_plate_event.php
check_action_url=http://lpr.metrici.ro/io/qr/check_action_event.php
check_action_min_probability=0.6
same_plate_delay=10
plate_min_length=160
plate_max_length=350
input_stream_resx=1280
input_stream_resy=720
input_stream_window_active=0
input_stream_window_origx=60
input_stream_window_origy=40
input_stream_window_resx=1096
input_stream_window_resy=604

Advanced Setup with Barriers (0.ini)

[General]
input_stream_type=5
input_stream_address=192.168.100.70
input_stream_tcp_port=80
input_stream_username=root
input_stream_password=metrici
input_stream_fps_limit=0
companion_stream_type=0
companion_stream_address=192.168.1.6
companion_stream_tcp_port=80
companion_stream_username=admin
companion_stream_password=admin123
reporting_check_action_authkey=W0603E0W
reporting_check_action_id=22
reporting_url=http://dev2.metrici.ro/io/qr/reporting_event.php
check_action_url=http://dev2.metrici.ro/io/qr/check_action_event.php
check_action_send_trigger_address=
check_action_send_trigger_udp_port=0
open_barrier_url="http://admin:admin@192.168.1.100/outs.cgi?out0=0"
open_close_barrier_delay=10
close_barrier_url=
open_barrier2_url=
open_close_barrier2_delay=10
close_barrier2_url=
check_action_min_probability=0.6
same_plate_delay=1
plate_min_length=100
plate_max_length=700
single_plate_mode=0
cars_direction=36
cars_event_type=1
input_stream_resx=1920
input_stream_resy=1920
companion_stream_resx=1920
companion_stream_resy=1080
input_stream_window_active=0
input_stream_window_origx=292
input_stream_window_origy=88
input_stream_window_resx=592
input_stream_window_resy=788
live_view_active=1
live_view_url=http://dev2.metrici.ro/io/qr/live_view.php
external_trigger_type=0
external_trigger_seconds=1
lpr_engine_working_mode=0
weight_scale_type=0
weight_scale_address=
weight_scale_tcp_port=10001
radar_type=0
radar_address=
radar_tcp_port=10002

16.18 Editing the INI File

You can edit the INI file manually using any text editor. However, it's recommended to use the application's Settings window when possible, as it provides validation and prevents syntax errors.

Best Practices for Manual Editing

• Backup first - Always make a copy of the current configuration before editing
• Use plain text editor - Use editors like nano, vim, or gedit; avoid word processors
• Preserve formatting - Keep the [General] section header and key=value format
• Test changes - Restart the application after editing to apply changes
Note: The application monitors the INI file for changes. When you save modifications while the application is running, it will automatically reload the settings. This allows for hot-reconfiguration without restarting the application.

16.19 Troubleshooting Configuration Issues

Problem: Application doesn't recognize my INI file changes.

Solutions:

• Ensure the file is named correctly (usually app_id.ini)
• Verify the file is in the correct location
• Check for syntax errors in key names and values
• Restart the application to ensure all settings are loaded
Problem: Camera connection fails with correct settings in INI file.

Solutions:

• Verify the IP address is reachable from the application host
• Check that the stream type matches your camera model
• Confirm the TCP port is correct for your camera's protocol
• Test credentials directly in a web browser or video player first
• Check firewall rules on both the camera and application host

16.20 Configuration File Migration

When migrating between systems or upgrading the application, you can transfer your configuration by copying the INI file. However, you may need to update the following settings:

• Network addresses - Update IP addresses for cameras and servers on the new network
• Hostnames - If using hostnames, ensure DNS resolution works on the new system
• Authentication keys - Update any server-side keys if they have changed
• Device paths - For serial devices, update the device path

Troubleshooting

Camera Connection Issues

Problem: Camera shows "Disconnected" or "Connecting" but never connects.

Solutions:

• Verify camera IP address is correct and camera is on the network
• Check username and password credentials
• Ensure the correct stream type is selected
• Check firewall settings allow traffic on the camera's port
• Verify camera is functioning by accessing it directly in a web browser
• Ping it

Poor Recognition Accuracy

Problem: Many QR codes are not detected or are read incorrectly.

Solutions:

• Adjust the detection window to focus on the area where codes are clearly visible
• Improve lighting conditions at the camera location
• Adjust camera angle to capture codes head-on rather than at an angle
• Lower the minimum probability threshold
• Increase FPS limit if items are moving fast
• Adjust minimum/maximum code length to match expected data format

High CPU Usage

Problem: Application uses too much CPU, causing slow performance.

Solutions:

• Enable and optimize the detection window to reduce processed area
• Lower the FPS limit
• Use trigger-based mode instead of continuous mode
• Enable single code mode
• Use H264 stream instead of MJPEG if available (more efficient compression)

Duplicate Code Entries

Problem: The same QR code is recorded multiple times.

Solutions:

• Increase the "Same Code Delay" setting
• Enable single code mode
• Use external trigger to ensure codes are only captured once per item

Barrier Not Opening

Problem: Barrier control commands are not working.

Solutions:

• Verify barrier URLs are correct and accessible
• Check that the server at the URL is running
• Ensure the application has network access to the barrier controller
• Verify barrier controller is configured to accept commands
• Check authentication keys and IDs if required

Settings Not Saving

Problem: Settings are lost when restarting the application.

Solutions:

• Always click "Save" before closing the settings window
• Check file permissions on the settings file
• Verify sufficient disk space is available

Glossary

Term	Definition
FPS	Frames Per Second - how many images are captured per second
H264	Video compression format - efficient video encoding standard
HTTP	HyperText Transfer Protocol - web communication protocol
IP Camera	Network Camera - camera that sends video over a computer network
MJPEG	Motion JPEG - video format where each frame is a JPEG image
QR Code	Quick Response Code - two-dimensional barcode that can be scanned
RTSP	Real Time Streaming Protocol - protocol for streaming media
TCP	Transmission Control Protocol - reliable network communication method
UDP	User Datagram Protocol - fast network communication method

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Technical Support

If you need additional help:

• Check the application logs for error messages (accessible via the Settings window)
• Check app_id.log to see more logs from each application
• Verify network connectivity between all devices
• Ensure all devices are using the latest firmware
• Contact your system administrator for network or server issues

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Document Version: 1.0
Application Version: Metrici QR Code Recognizer v2.4
Last Updated: February 2026