~Catalog
- What is a large space?
- The importance and complexity of large space monitoring.
- Large space monitoring term introduction 1 - "pixel density" - requirement for clarity
- Large space monitoring term introduction 2 - "invalid pixels" - waste of pixels
- The existing large space monitoring solutions and problems
- Our solution - super HD video tracker
- The advantage of super HD video tracker
- Super HD video tracker installation conditions and equipment parameters in highway
What is a large space?
Large space monitoring refers to the continuous space open without visual partition. In the field of monitoring, the main difference between small space monitoring is that large space monitoring cannot be achieved with a single camera but need to use a combination of multiple cameras or PTZ camera monitoring to achieve most covering.
For example, the highway toll station and service area, all belong to large space.
The importance and complexity of large space monitoring
Compared with the small space monitoring, large space monitoring range is bigger, more moving object, lack of physical isolation, etc. The openness and liquidity of the large space determines its frequently happened violations. A lot of illegal and criminal behavior and mass incidents occurred in the large space area. So large space monitoring has been a top priority in the field of monitoring.
But due to the large space is usually open public area, with more moving object and need to monitor more complete coverage. A single camera can't do, it has blind spot. Therefore, large space monitoring is the most complex one in monitoring field. It's hard to make early warning in the large space monitoring, a lot of them become decorations. Unclear image or blind angle found during replay, can't see the violations.
Large space monitoring term introduction 1 - "pixel density" - requirement for clarity
Below picture 1 shows the different resolution required "pixel density", such as a 2 million pixels (1920 x 1080 resolution) camera, if it illuminates the target scene with width of 10m, then its pixel density in width= 1920 / 10 = 192 pix/m. Resolution between 164 pix/m and 246 pix/m in picture 1.
When monitoring goes into the digital age, the pixel density should be an important basis when we design definition of monitor system.
In practice, if monitoring system only requires monitoring of overall situation, doesn't need to identify the faces, identify license plate, and even look at the cashier's note denomination, the pixel density of 70 pix/m will be enough. Otherwise, 130 pix/m or even as many as 250 pix/m pixel density is your basic requirement.
Picture 1 Effects in different resolution (pix/m)
Large space monitoring term introduction 2 - "invalid pixels" - waste of pixels
In the design and implementation of the monitoring system, often appear "invalid pixels".
