Tips and Education

Secrets of Video security

I got involved with the video security business when a friend invited me to join with him. We had a lot of success, but the business grew too fast and we sold the business. Now I started Aegis Security and I want to provide quality equipment at a great price. Before I purchased inventory, I tested many options. With that experienced I designed cameras and recorders that are easy to use and of great quality.
I want to provide educational information about video security equipment and choosing what is right for the needs of a project.
DVR - A digital video recorder receives an analog video feed from a camera and records it in a digital format on a hard drive. This means that the cameras used are analog cameras, which is the same format used used with the old tube televisions.
Analog Camera - resolution is measured in TVL or television lines. It is similar to a digital flat panel television today, but in my opinion lacking in quality. Imagine if an analog video stream is sent to be recorded and then converted from analog to digital. In the conversion quality will be lost.
NVR - The Network Video Recorder is like a DVR but it receives a digital signal from the digital camera. It all connects together like a computer network. The camera has a CAT5 network cable and connects to a network switch and then into the network video recorder. The NVR is like a small computer. It has an operating system and can be programmed to perform many logical functions. It has a graphic interface and a mouse and the user can establish rules and define how to record. For home or business security rules are usually setup so that the recorder will capture video only if there is movement. If the camera or recorder detects movement, then the recorder will record for a given time. If the movement continues then the timer resets. For example, if a camera at the front door of a residence detects someone going into the house, the video will record for the given time, say 30 seconds. If there is a conversation taking place at the door, then the recording will continue until there is 30 seconds of no movement.
Digital camera - is measured in megapixels. The same as the recorder. The digital video is sent to the recorder and recorded to the hard drive. A one megapixel camera is the same as 720p resolution. A 1.3 megapixel camera is 960P. The very common television which is the format of a BluRay is labeled with a 1080p screen, that is the same as a 2 megapixel camera, and so on. A 12 megapixel camera is like a 4k television.

Which camera resolution do I need?
The answer to this question is about how much detail is needed. Is it do you want to see the person and the face and not the logo on the jacket? A 720p camera or 1 megapixel is suficient. With a 2 megapixel camera more details is is available, by zooming in on the image, a closer view with detail can be seen.