Traffic Cameras Around Maine. I-295 Greater Portland Area; MaineDOT Interstate Cameras - Portland to Houlton. The Weather Camera Program Office is pleased to announce the availability of the new Weather Cams web site for public testing and feedback. The new Weather Cams website represents the next generation of our legacy web site which incorporates camera images and weather information, along with additional data sets (where available) such as airport diagrams, chart supplements, and approach.
With the continuous development of the IP video surveillance market, security manufacturers constantly enrich its product line. By coincidence, we have four network cameras from different Chinese manufacturers. All of them are 1.3 megapixel outdoor IR network cameras, which dedicated to middle and low-end market. Although we have seen some test reports on camera's functionality and performance, we have not seen the internal design of these network cameras. Let’s walk you out through this detailed comparison disassemblely.
In terms of appearance, Hikvision, Uniview and Tiandy adopt white/black style design. Uniview camera is light weight, the appearance of Hikvision and Tiandy is pretty close. Dahua camera basically keeps its conventional appearance.
Next, we began to disassemble these cameras with the order of Hikvision, Uniview, Tiandy, Dahua. Firstly let's disassemble the Hikvision camera:
Next, disassemble the Uniview Camera:
Disassemble the Tiandy IP Camera:
It's turn to disassemble Dahua IP Camera:
1# Hardware layout comparison
Unicameral Meaning
In normal use, a high quality security camera can use 2-3 years without any problems. But only for the pursuit of a good look, rather than on durability and reliability, likely the security cameras stop working because of unpredictable extreme weather conditions. Next, we continue disassembling these cameras to compare hardware structure, heat dissipation, circuit protection, image sensor design.
Hikvision IP camera adopts single PCB board design, with hollow layout, internal design is clean and beautiful, using rugged heavy camera housing.
Uniview adopts the unique dual-PCB boards design, difficult to assemble.
Tiandy products also adopt single-PCB board structure, layout is clean and simple.
Dahua IP camera also adopts the single-PCB board design, internal space is large, the PCB board is small, layout is compact.
Hardware layout rating:
- Hikvision: ★★★★★
- Uniview: ★★★
- Tiandy: ★★★★★
- Dahua: ★★★
2# Structure & Heat dissipation design
No heat dissipation design on Hikvision's CPU, through PCB hollow design can stop heat conveying to image sensor.
Next, the Uniview IP camera, the processor and CMOS image sensor are located to different PCB boards, ensuring CPU heat will not cause impact to the image sensor. But the structure is complex, CPU heat can't dissipate out. Additionally, the image sensor has no separate heat dissipation design.
The heat passes heat dissipation metal plate to reach camera housing, Dahua IP cameras heat dissipation design performance is ordinary. Small PCB size may cause high temperature of image sensor, indirectly has impact on imaging.
Compared the above design, Tiandy heat dissipation is simple, camera's CPU directly contact the silicone tape to provide good heat dissipation.
Heat dissipation rating:
- Hikvision: ★★★★
- Uniview: ★★★
- Tiandy: ★★★★★
- Dahua: ★★
3# Circuit Protection Design
Hikvision: after the network transformer stage uses two small transient-voltage-suppression (TVS) diodes to protect electronic circuits against transients and overvoltage threats such as EFT (electrically fast transients) and ESD (electro-static discharge). On its power input, it has a SMC package power protection device to protect post-stage circuit against lighting surge.
Uniview: after the network transformer stage uses a 6PIN chip to provide EFT and ESD protection. On its power input, it also has a SMC package surge protector design.
Tiandy: after the network transformer stage uses a SOIC 8 PIN chip to protect its network connection. On its power input it has SMC package high-power protection diode to against voltage surge.
Dahua: The same with the above cameras, Dahua IP camera also has TVS protection after the network transformer stage; the power input circuit design uses a small power rate TVS, only can be effective to the electrostatic, may not prevent the camera from damaging by lightning surges.
Circuit Protection rating:
- Hikvision: ★★★★★
- Uniview: ★★★★★
- Tiandy: ★★★★★
- Dahua: ★★★
4# CMOS Image Sensor
Hikvision: 1/3-inch ON-Semiconductor/Aptina AR0130, image quality is good.
Uniview: 1/3-inch ON-Semiconductor/Aptina AR0130, image quality is good.
Tiandy: 1/3-inch SONY IMX225, delivers the best image quality under low light conditions.
Dahua: 1/3-inch OmniVision OV9756, sensor package is small, core temperature is high.
Sensor's low light performance rating:
- Hikvision: ★★★★
- Uniview: ★★★★
- Tiandy: ★★★★★
- Dahua: ★★★
Unis Camera
The Hikvision camera does not have many spare parts, but many screws, disassembling is easy.
Uniview uses torx screws, structure is complex.
Tiandy cameras have few spare parts, easy to assemble.
The Dahua IP camera has few spare parts, however it's not easy to disassemble.
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Unicameral Government Definition
Swimming, snorkeling, and diving are prohibited 150 feet around the pier. Section 50-112(f) of the City Code prohibits swimming, paddling, kayaking, surfing, or kiteboard/surfing within 50 yards or 150 feet of the City fishing pier.
Unis Camera Driver
Section 46-8 of the City Code makes it unlawful to destroy any building or other thing belonging to or under the control and care of the City. Pursuant to Section 806.13, Florida Statutes, a person commits the offense of criminal mischief if he or she willfully and maliciously injures or damages by any means any real or personal property belonging to another. If the damage is $200 or less, it is a second-degree misdemeanor. If the damage is $1,000 or greater, or if there is interruption or impairment of a business operation or public communication, transportation, supply of water, gas or power, or other public service which costs $1,000 or more in labor and supplies to restore, it is a third-degree felony.