Your guide to best CCTV
M. KAWAM ELECTRONICS Security system expert
In this page we will introduce most useful information about CCTV cameras :
- Camera type
- Conventional analog camera
- IP Camera
- Camera resolution
- Camera lens
- Field of view
- Camera shape and style
- Very old cameras Low Pixels (resolution, 380V, 420V, 480V, 520V)
- Medium resolution Pixels (600V, 700V, 1000V)
What is High Definition?
High definition video contains more pixels, and a larger image size, than traditional cameras to ensure you get clear and detailed video. HD cameras are available from many manufacturers and in every camera style (dome, PTZ, fixed, ect) so it’s easy to add high definition to your surveillance system.
* Type B- IP cameras?
What is IP Camera ?
IP cameras are also known as network cameras because they can transmit audio and video over your network or the Internet using cables. Each IP camera has its own IP address. IP cameras have a much improved image and video resolution.
Watch videos or view the images remotely. You can also send these videos and images anywhere as long as you have an Internet connection.
Resolutions and frame rates may be adjusted to suit your preferences.
Allow for two-way communication.
* Camera resolutions
At present, high resolution has become a must-have feature for a quality security camera.
What Is Security Camera Resolution
IP security camera resolution is the total number of pixels that make up an image, which is measured by the image width and height.
For example, the width and height of a 2MP image are 1920 and 1080 respectively. By multiplying these two figures together, you will get 2,073,600, which is the total number of pixels contained in the image.Also, the height of an image is used to symbolize the resolution andthus, you can say 1080p resolution when talking about an image with 2 million pixels.The most common resolution for home security camera in the market includes 2MP (1080p), 4MP (1440p), 5MP (1920p) and 8MP (4K/2160p).
Analog Security Camera Resolution
Comparing to IP security camera resolution, analog security camera resolution is measured differently by the number of horizontal and vertical television lines (TVL) displayed in an image.
Why television lines?
Because the analog video technology is derived from the television industry and the highest resolution for a traditional analog security camera is "D1", also called "4CIF", entails 704*480 pixels.
Later, new video technology called analog high definition is applied to analog security cameras, making it possible for them to produce 720p and 1080p high resolution videos.
Here is an analog security camera resolution chart for your reference:
* CCTV camera lens guide :
What is field of view?
* 2.8mm for a 90° view
* 4mm for a 60° view
* 6mm for a 45° telephoto view
A PRACTICAL GUIDE TO CCTV VIDEO RESOLUTIONSThe table below lists some of the more commonly used resolution terms in CCTV applications. Any resolution over 1 million pixels is considered ‘megapixel’. In the case of megapixel cameras, the labels are approximate. For example, a 2 megapixel camera actually captures 1,920,000 pixels per frame. A 3 megapixel camera captures 3,145,728 pixels per frame.
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| * Camera shape and style |
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| Depend on many parameters : |
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| Indoor or outdoor |
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| Water proof , weather proof, night vision |
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| Auto focus, PTZ, Internet camera |
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| Thermal imaging |
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