Processing Speed Of An IP Camera
♦ Processing Speed Of An IP Camera – what is the ideal processing speed of an IP camera DSP?
A: The ideal process speed of a digital signal processor is just enough and no more but we’d argue overshooting on processing speed is better, especially if the camera is equipped with edge video analytics like people counting, heat mapping, object tracking and face recognition.
Digital signal processing in relation to camera performance allows digital image streams to be enhanced even at very high resolutions. This is beneficial when you’re working to lift a camera’s dynamic range up to 120dB, as well as when reducing noise in the image stream, compressing a stream for recording, enhancing a scene in low light, or balancing light and colour across a scene incorporating shadow and bright light.
Exactly how much processing will be required depends on the work the processor is being asked to do. One of the easiest ways to see a camera processor that’s unable to keep up is when an image stream start to show motion blur around moving objects in the presence of strong backlight during the day – faces go smudgy.
A DSP is a programmable device with a native instruction code that carries out millions of floating-point operations per second. Although the mathematical theory underlying DSP techniques such as Fast Fourier and Hilbert Transforms is complicated, the numerical operations required to implement these techniques are simple, consisting mainly of operations that could be done on a cheap four-function calculator.
DSP’s ability to sequence and reproduce thousands of discrete elements is what designers use to enhance video images. DSP techniques can perform functions such as Fast-Fourier Transforms (FFT), delay equalization, programmable gain, modulation, encoding/decoding, and filtering. In addition, programs can be written where filter weighting functions (coefficients) can be calculated on the fly, reducing memory requirements while algorithms can be dynamically modified as a function of signal input.
Very important is that the architecture of a DSP chip is designed to carry out its operations incredibly fast, processing up to tens of millions of samples per second, to provide real-time performance. While the computations aren’t all that challenging, the extended precision processing, big bandwidth and high precision of the DSP operation is what’s so useful.
When it comes to processing speed, more is better within the bounds of useful camera function, power draw and heat generation, especially when it comes to high resolution, 60ips and video analytics. The best way to ensure you get the DSP processing speed you need is to buy a more expensive camera with a faster chipset. If you don’t have the budget for this, you’ll need to activate camera functions judiciously.
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