Installing a video surveillance system, you need to understand what it is that the system is intended for. That may seem obvious but there are 4 core definitions of camera application
1. Observe the what is happening in an area
2. Observe the behavior of people in an area
3. Recognize a person you know
4. Identify a person you don't know
Nearly all people need to identify a customer, watch staff theft and overview an area with one security camera, which is 3 of the above definitions. In nearly all applications two or more cameras will be required to achieve this. One for ID and others for overview and staff. Failure to recognize this is why we see so much poor quality footage on TV.
Designing first with a 3D CAD helps to test the scene to determine the right camera resolution, lens and location to give the desired results. This will save you relocating or replacing cameras later on.
The following video shows us how to import a site map into the 3D CAD and then place cameras on it. Even before we have created any 3D walls it is going to give an indication of the camera coverage.
The next part explains the above four coverage definitions and the way to set the pixel/metre ratio for each. Once set, we can see from the shaded coloured areas as to where in the scene you will achieve each level. The tools to create 3D objects, walls and people are also shown in this section
You will find how to test the scene with different megapixel resolution cameras in part 3 as well as the impact electronic zoom has on the actual useable resolution of an image. Un like on TV where we zoom in 800% and still have a great image, the real world would not give great results.
Should you be looking for a far more in depth knowledge of video surveillance as well as how to design a high quality CCTV system, have a look at the training at CCTV Design. You'll learn more on Australian Standards AS4806
1. Observe the what is happening in an area
2. Observe the behavior of people in an area
3. Recognize a person you know
4. Identify a person you don't know
Nearly all people need to identify a customer, watch staff theft and overview an area with one security camera, which is 3 of the above definitions. In nearly all applications two or more cameras will be required to achieve this. One for ID and others for overview and staff. Failure to recognize this is why we see so much poor quality footage on TV.
Designing first with a 3D CAD helps to test the scene to determine the right camera resolution, lens and location to give the desired results. This will save you relocating or replacing cameras later on.
The following video shows us how to import a site map into the 3D CAD and then place cameras on it. Even before we have created any 3D walls it is going to give an indication of the camera coverage.
The next part explains the above four coverage definitions and the way to set the pixel/metre ratio for each. Once set, we can see from the shaded coloured areas as to where in the scene you will achieve each level. The tools to create 3D objects, walls and people are also shown in this section
You will find how to test the scene with different megapixel resolution cameras in part 3 as well as the impact electronic zoom has on the actual useable resolution of an image. Un like on TV where we zoom in 800% and still have a great image, the real world would not give great results.
Should you be looking for a far more in depth knowledge of video surveillance as well as how to design a high quality CCTV system, have a look at the training at CCTV Design. You'll learn more on Australian Standards AS4806
About the Author:
Tim can offer great guidance on selecting a CCTV design tool. He has been in the security industry since 1988. Unique version for reprint here: CCTV Design Tool.
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