The resolution of an IP camera is an important factor to consider when choosing a camera, as it determines the level of detail that can be captured and can affect the overall quality of the video footage.
Resolution is a crucial component of any surveillance camera as it determines the camera's ability to capture and reproduce even the smallest details in the image. The resolution of an IP camera is measured by the total number of pixels in its matrix, both vertically and horizontally.
However, cameras with the same resolution may still produce images of varying quality due to other factors like color reproduction and the physical resolution of the matrix. To compare the quality of different matrices, the resolution is often measured in TVL (television lines), which indicates the number of visible lines in the picture.
For most video surveillance systems, a resolution of 400 TVL is sufficient, while a resolution of more than 500 TVL can capture even the smallest elements such as facial expressions or license plate numbers.
Resolution should be specified at the target, not only at the camera
More pixels are useful only if the optics, focus and scene geometry deliver those pixels to the object of interest. A 4K wide-angle view may contain fewer useful face pixels than a 2 MP camera aimed tightly at a doorway. Higher resolution also increases bandwidth, storage and decoding load unless bitrate is controlled aggressively.
Use the smallest resolution that reliably solves the task
For SmartVision, analytics quality depends on object size and clarity in the decoded frame. Select resolution together with lens and mounting distance, then measure the actual bitrate for archive planning. See Camera Lens, Sensor Size and Compression.