Home Surveillance Smart PT Camera With 4MP Resolution, Human Detection, And 355°/90° Pan-Tilt Tracking
In the context of the ever-increasing security needs in homes, commercial establishments, and offices, the Dual-Lens WiFi PT Camera has become an ideal choice for many users due to its excellent performance and unique functions. Compared with traditional single-lens cameras, it has achieved a qualitative leap in monitoring coverage, image clarity, intelligent recognition, and ease of use. Next, we will delve into the various parameters and features of this type of camera to comprehensively analyze its advantages.
I. Core Imaging Parameters
(1) Resolution
Mainstream Resolutions and Application Scenarios
4MP (2560×1440, i.e., 2K resolution): This is a relatively common resolution configuration in current dual-lens WiFi PT cameras. In home scenarios, such as living rooms and bedrooms, 2K resolution is sufficient to clearly capture facial features and object details. For example, in a living room, facial expressions and movements of family members can be clearly identified within 5 meters; text on book covers and content on TV screens can be seen within 10 meters. In terms of storage, each hour of video occupies approximately 1.5GB of storage space. Combined with a common 128GB memory card, it can achieve cyclic video storage for several days, meeting the daily monitoring needs of most families.
8MP (3840×2160, i.e., 4K resolution): This is a high-end configuration, mostly used in commercial scenarios with extremely high requirements for monitoring image quality, such as jewelry stores and high-end office building receptions. Within 30 meters, key information such as license plate numbers and product label details can be clearly viewed by zooming in on the image, providing strong support for accurate forensics. However, 4K resolution has higher requirements for network bandwidth, requiring a stable transmission bandwidth of at least 4Mbps or more, and the video storage demand increases significantly, with each hour of video occupying approximately 4GB of space.
Collaborative Advantages of Dual-Lens Resolution
Under the dual-lens design, the main lens and the auxiliary lens can be configured with different resolutions according to actual needs to achieve the best monitoring effect. For example, the main lens adopts high resolution (such as 4K) to focus on key monitoring areas, such as the cash register of a store, to clearly record transaction details; the auxiliary lens covers a larger surrounding area with a lower but sufficient resolution (such as 2K), such as the shelf area of the store, ensuring overall monitoring without blind spots. The two complement each other and work flexibly in different scenarios.
(2) Lens Parameters
Main Lens Parameters and Functions
Focal Length and Viewing Angle: The main lens usually adopts a fixed focal length design, with common focal lengths ranging from 2.8mm to 4mm. A 2.8mm focal length corresponds to an ultra-wide viewing angle of 120°-140°, suitable for monitoring large areas, such as a large living room, enabling almost panoramic coverage, allowing the entire space to be fully visible. A 4mm focal length provides a viewing angle of 80°-100°, which can clearly present the edge details of objects at a distance of about 5 meters. For monitoring specific targets, such as people entering and exiting the door and transaction operations at the counter, it can highlight key details while ensuring a certain coverage range.
Sensor and Aperture: Most use 1/2.7-inch or 1/1.8-inch CMOS sensors, paired with a large aperture of F1.6-F2.0. Taking the F1.6 large aperture as an example, compared with the F2.0 aperture, its light intake is increased by 40%. In low-light environments such as cloudy days and evenings, the image noise is significantly reduced. Combined with the "3D digital noise reduction" technology, relatively clean and clear images can be presented even in the night infrared mode. The 1/1.8-inch large-size sensor has a 50% larger photosensitive area than the 1/2.7-inch sensor, with significantly improved low-light sensitivity. Some models with starlight-level imaging capabilities (0.01lux illumination) can present color images under moonlight.
Auxiliary Lens Parameters and Functions
Wide-Angle Blind Spot Compensation Auxiliary Lens: Generally, it has a 1080P resolution (2 million pixels), a viewing angle of 110°-170° (common 140° ultra-wide angle), and a focal length of 2.8mm. It is usually installed at an angle of 90°-120° with the main lens to cover the side blind areas that the main lens cannot reach. In complex family house types, such as L-shaped living rooms, when the main lens monitors the main area of the living room, the auxiliary lens can effectively cover side areas such as the balcony entrance, avoiding the situation where people enter from the side without being monitored. At the same time, the auxiliary lens adopts a "distortion correction algorithm" to control edge distortion within 10%, ensuring that the proportion of objects in the monitoring image is normal without obvious stretching and deformation.
Night Vision Enhancement Auxiliary Lens: Equipped with 8 infrared LED lights, the night vision distance can reach 5-8 meters, working in collaboration with the "full-color night vision" function of the main lens. In the night environment, the main lens turns on white light filling to present color images, facilitating the clear identification of human faces; the auxiliary lens uses infrared light to monitor the side areas, avoiding white light from disturbing family members' rest, taking into account both detail recognition and concealment needs. Its infrared wavelength is 940nm, with no red light leakage during operation, and will not expose the device's position, suitable for installation in light-sensitive areas such as bedrooms and baby rooms.
Long-Focus Detail Auxiliary Lens: With a fixed focal length of 6mm and a viewing angle of 60°, it focuses on monitoring long-distance targets 10-30 meters away. In store scenarios, the main lens monitors close-range transactions at the cash register, and the auxiliary lens focuses on the distant parking lot outside the store. When a suspicious vehicle parks 20 meters away, the auxiliary lens can clearly capture the license plate number, while the main lens records the process of people entering and exiting the store and transactions, achieving far and near layered monitoring to fully protect store safety.
II. WiFi Network Parameters
(1) WiFi Protocols and Frequency Bands
Performance Comparison of Mainstream Protocols
IEEE 802.11 b/g/n/ac (WiFi 4/5): Most dual-lens WiFi PT cameras currently support these protocols. Among them, WiFi 5 (ac) can achieve a theoretical transmission rate of 867Mbps in the 5GHz frequency band, which can smoothly transmit 2K dual-lens videos (single-lens 2K video transmission requires 2-4Mbps bandwidth, and dual-lens requires 4-8Mbps in total). The real-time intercom delay can be controlled within 300ms, ensuring smooth remote monitoring images and clear voice calls without jamming.
IEEE 802.11 ax (WiFi 6): Some high-end models already support WiFi 6. It introduces MU-MIMO (Multi-User Multiple-Input Multiple-Output) technology, which has significant advantages in multi-device networking environments. For example, in a home network with more than 10 smart devices, WiFi 6 can still ensure stable transmission of dual-lens videos, reducing latency by 50% compared with WiFi 5, effectively improving network efficiency and stability.
Advantages and Application Scenarios of Dual Frequency Bands
2.4GHz Frequency Band: It has strong penetration ability, can penetrate 2 load-bearing walls, and the transmission distance can reach 50 meters in an open environment. When the camera installation position is far from the router, such as from the living room to the bedroom with wall obstacles in between, the 2.4GHz frequency band can maintain a relatively stable signal connection, ensuring the normal operation of the camera.
5GHz Frequency Band: It has a fast transmission speed, 3-5 times that of the 2.4GHz frequency band, and less interference. When the camera is close to the router (within 10 meters) and has high requirements for video transmission speed, such as transmitting 4K dual-lens videos, choosing the 5GHz frequency band can effectively avoid image jamming caused by congestion in the 2.4GHz frequency band, ensuring smooth transmission of high-definition videos.
(2) Network Stability Enhancement Technologies
Automatic Frequency Band Switching: The camera has an automatic frequency band switching function, which can monitor network quality in real time. When the 5GHz signal weakens, it automatically switches to the 2.4GHz frequency band to ensure uninterrupted network connection. During the switching process, there is no black screen in the video image, only a brief frame rate drop, and users hardly notice the switching process, ensuring the continuity of monitoring.
Signal Enhancement Antenna: Built-in 2 high-gain omnidirectional antennas (gain 5dBi), and some high-end models support external antennas (gain 8dBi). In complex multi-wall obstacle environments, compared with ordinary single-antenna devices, the signal strength is increased by 60%. For example, in old multi-story residential buildings with complex room layouts and thick walls, this camera can effectively penetrate the walls, maintain a stable WiFi connection, and ensure the transmission of monitoring data.
Disconnection Reconnection Mechanism: Once the WiFi connection is disconnected, the camera can automatically try to reconnect to the network within 10 seconds. The video recorded during the disconnection period will be temporarily stored locally, and after the network is restored, it will be automatically uploaded to the cloud or transmitted to the mobile phone terminal, avoiding data loss due to network interruption, and ensuring the integrity and security of monitoring data.
III. Video and Imaging Characteristic Parameters
(1) Video Coding and Frame Rate
Advantages of Coding Format: The mainstream adopts H.265 coding format, whose compression efficiency is 50% higher than that of H.264. Under the same image quality, 2K dual-lens video encoded with H.265 occupies about 2GB of storage space per hour, while H.264 requires 4GB. Taking a 128GB memory card as an example, using H.265 encoding can store about 60 hours of video and support cyclic coverage, effectively saving storage space and extending local storage time.
Frame Rate Stability: The default frame rate is 25fps, and some high-end models can reach 30fps, and the frame rate remains consistent when dual-lens record synchronously. At a frame rate of 30fps, when shooting fast-moving objects, such as running pets and fast-walking people, the image has no trailing, and the details are captured coherently, which is more suitable for monitoring dynamic scenarios, such as children playing in the room and customers moving frequently in the store, and can clearly record every moment of action.
(2) Night Vision Capability and Collaboration
Dual-Lens Night Vision Division Modes
Mode 1: Main Lens Close-Range Full Color + Auxiliary Lens Long-Range Infrared: The main lens is equipped with 2 white LED lights, with a fill light distance of 3-5 meters, which can present color images at night, facilitating clear identification of human facial features; the auxiliary lens is equipped with 4 infrared LED lights, with a night vision distance of 5-8 meters, responsible for monitoring the side long-distance areas, presented in black and white images, suitable for scenarios such as doorways and living rooms that need to accurately identify visitors, ensuring the detail recognition of the main area while taking into account the monitoring of the side areas.
Mode 2: Dual-Lens Starlight-Level Full Color: Both lenses adopt starlight-level sensors (0.005lux illumination), which can present color images without fill light in weak light environments such as moonlight, and the auxiliary lens has a wider viewing angle. This mode is particularly suitable for light-sensitive areas such as bedrooms and baby rooms, ensuring clear night monitoring images without affecting people's rest due to fill light.
Night Vision Switching Response Speed: When the ambient light intensity is lower than 10lux, the camera automatically switches from "day mode" to "night mode". There is no flicker in the image during the switching process, and the response time is ≤1 second. When the light changes suddenly in the evening, such as the moment when the indoor light is turned off, it can quickly complete the night vision mode switching, ensuring that key images are not lost and timely capturing possible abnormal situations.
(3) Wide Dynamic Range and Backlight Processing
Advantages of WDR Wide Dynamic Technology: Both lenses support WDR (Wide Dynamic Range) technology, with a dynamic range of up to 120dB. In strong light and backlight scenarios, such as monitoring areas close to windows where the sun shines directly outside the window and the indoor light is dim, the camera can retain the details of objects outside the window and indoors at the same time. For example, when shooting a desk close to the window, it can clearly capture birds flying outside the window and present the face of the reader and the content of the book indoors, effectively avoiding the problem of overexposure outside the window and underexposure indoors common in single-lens cameras, ensuring the overall clarity of the image and the completeness of information.
Auxiliary Lens Backlight Optimization: The auxiliary lens is specially optimized for side backlight scenarios, such as monitoring the window at the end of the corridor. Through the "regional exposure compensation" algorithm, the exposure of the strong light area is reduced separately to ensure that the side objects are clearly visible in the backlight environment, comprehensively improving the quality of monitoring images and not missing any details.
IV. Intelligent Function Parameters
(1) Dual-Lens Collaborative Detection and Alarm
Dual Recognition Technology Reduces False Alarms: The main lens adopts AI human shape recognition technology to identify "standing/moving human contours"; the auxiliary lens uses PIR infrared detection technology to detect "human body heat changes". Through cross-validation of dual-lens data, the false alarm rate is greatly reduced. When the main lens identifies an object movement but the auxiliary lens does not detect human body heat (such as wind blowing curtains), or the auxiliary lens detects a pet (non-human shape), no alarm will be triggered; only when both detect data that conforms to human characteristics, it is judged as a "valid target" and an alarm is triggered. Compared with single-lens, the false alarm rate is reduced by 80%.
Regional Linkage Alarm for Accurate Reminder: Users can set "warning areas" for dual-lens in the APP respectively. For example, in a home scenario, the main lens warns the living room sofa area, and the auxiliary lens warns the balcony door area. When someone enters from the balcony door (auxiliary lens alarm) and walks to the sofa (main lens alarm), the camera will push a "cross-region movement" reminder and provide trajectory videos recorded synchronously by dual-lens, allowing users to understand the whole picture of the abnormal situation at the first time and respond in a timely manner.
(2) Automatic Tracking and Zoom
Dual-Lens Linkage Tracking: The main lens supports horizontal 355° rotation tracking, and the auxiliary lens fixedly monitors the blind area. When the target object moves, the main lens quickly rotates to follow, and the auxiliary lens records the image of the target entering the blind area, avoiding the loss of the target when the single-lens rotates. For example, in a store, a thief moves from a corner (monitored by the auxiliary lens) to the cash register (tracked by the main lens). The dual-lens videos can be completely spliced into the thief's action path, providing key "intrusion path" evidence for the police.
Intelligent Digital Zoom: The main lens supports 4x digital zoom, and the auxiliary lens supports 2x zoom. When the target is far away, such as a suspicious person appearing 10 meters away, users can double-click the screen in the APP to zoom in on the target and view details, such as text patterns on the person's clothes. Based on 2K original image quality, the zoomed image can still maintain 720P clarity, providing support for accurate identification.
(3) Face Recognition and Visitor Management
Local Face Database Function: The camera supports storing 50-100 faces, which can be classified and marked as "family/friends/strangers". When a family member is recognized, the mute function is automatically turned on, only the visit time is recorded, and no alarm information is pushed; when a stranger is detected, a "stranger visit" reminder is immediately pushed, accompanied by front and side photos taken by dual-lens, facilitating users to know the identity of the visitor in time and ensuring family safety.
Dual-Lens Collaborative Face Recognition: The main lens is responsible for taking front faces for comparison with the database, and the auxiliary lens records side faces and body features, such as height and clothing. When a stranger appears again, even if the front face is blocked, it can be matched through the features recorded by the auxiliary lens and a reminder is issued again, greatly improving the accuracy and security of face recognition and effectively preventing potential risks.
V. Storage and Connection Parameters
(1) Storage Schemes
Local Storage: Supports Micro SD card storage with a capacity range of 32GB-256GB. It adopts the "dual-lens folder storage" method, where the main lens videos are stored in the "LENS_A" folder and the auxiliary lens videos are stored in the "LENS_B" folder, facilitating users to retrieve by lens classification. In 2K dual-lens mode, a 128GB memory card can store about 5-7 days of cyclic videos (triggering monitoring 20 times a day, each recording 30 seconds). For important videos, such as alarm video clips, the system automatically encrypts and locks them, which need to be unlocked with a password to prevent being overwritten by cycles, ensuring the safe storage of key evidence.
Cloud Storage: Provides free and paid cloud services. The free version supports 7-day cyclic storage, and dual-lens videos are merged and encrypted for upload, which can only be viewed by the device administrator. Video storage follows the "bank-level encryption standard" (AES-256) to ensure data security. The paid version (8-20 yuan per month) supports 30-day storage, and adds the "dual-lens synchronous playback" function (comparing dual-lens images in split-screen form in the APP) and the "video marking" function (manually marking important video clips to avoid being overwritten), meeting users' higher needs.
Dual Storage Backup: When an alarm event is triggered, the video is saved to both the SD card and the cloud to prevent data loss caused by device theft. Cloud data supports "permanent download", and users can download key evidence to local storage at any time, providing double insurance for security monitoring.
(2) Multi-Device Connection and Interaction
Number of WiFi-Connected Devices: Supports 5-8 mobile phones to view real-time images at the same time. Through APP permission management, administrators can flexibly set "family permissions" (able to control PTZ rotation and view videos) and "visitor permissions" (only able to view real-time images without operation permissions), meeting the multi-user viewing needs in home, commercial and other different scenarios, and ensuring the safety of device operation.
Two-Way Voice Parameters: Built-in omnidirectional microphone with a pickup distance of 5-8 meters, supporting noise reduction and echo cancellation functions; equipped with a 3W speaker, the volume can be adjusted to 100dB, and the voice delay is ≤0.5 seconds (affected by WiFi network). The clarity of two-way voice calls is close to that of mobile phone hands-free calls. In the home, it can remotely comfort a crying baby (such as saying "Baby, don't cry"), and in the store, it can communicate with customers in a timely manner (such as asking "May I help you?"), realizing efficient remote interaction.
VI. Installation and Protection Parameters
(1) Installation Methods and Flexibility
Multiple Installation Location Options: Supports multiple installation methods such as "desktop placement", "wall-mounted installation", and "ceiling installation", equipped with a universal bracket, which can achieve 360° horizontal rotation and -15°-90° vertical adjustment, facilitating users to flexibly adjust the angle of dual-lens according to actual monitoring needs. For example, when installed on the ceiling, the main lens can be aimed at the central area of the living room at 45° downward, and the auxiliary lens can be aimed at the balcony horizontally to the left, maximizing the monitoring coverage and ensuring no monitoring dead corners.
Simple Installation Operation: Provides two installation methods: drill-free installation (fixed with 3M adhesive, suitable for tiles, glass walls) and screw fixing (suitable for cement, wooden doors and other materials). A level is randomly provided to ensure the accurate installation angle of dual-lens and avoid image tilt. The entire installation process is simple and easy to understand, and ordinary users can complete the installation within 10 minutes without professional skills and put it into use quickly.
(2) Protection Level and Environmental Adaptability
Protection Level Adaptation Scenarios: Indoor models have a protection level of mostly IP54, with dustproof and water-splash-proof functions, suitable for indoor environments such as living rooms and bedrooms, which can effectively prevent dust intrusion and damage to the device caused by daily water splashing. Outdoor models have a high protection level of IP66, which can be completely dustproof and withstand high-pressure water gun spraying, suitable for outdoor environments such as courtyards and store doorways, and can work normally in harsh weather such as heavy rain and sandstorms, ensuring uninterrupted monitoring.
Wide-Temperature Working Capacity: Indoor models have a working temperature range of -10℃-50℃, and outdoor models have a wider range of -30℃-70℃. Outdoor models use "wide-temperature batteries"...
