Digital video quality is always an issue after the processing of data on a storage unit and the transfer of the recorded material onto a computer. Even if chances of deterioration are lower with digital materials, there were cases when digital video quality was impaired during these operations. At present, a lot of emphasis is put on the possibility to evaluate digital video quality for a number of applications.
Normally, according to expert criteria, digital video quality has to be evaluated on various video sequences from the original database. From this point of view, the performance of a certain system depends on the dynamic features of the input video signal, which includes the spatial and the amount of motion in the video. The objective approximation of digital video quality is performed by mathematical models based on metrics. The objectivity of the analysis only results when you introduce the data into a computer program to achieve the actual measurement.
Among the traditional ways of determining digital video quality we can mention the peak signal-to-noise ratio or the simple signal-to-noise ratio; both methods are objective and they are relevant and useful for multimedia purposes. Sometimes several other tests are necessary before the digital video quality for compression-decompression can be determined. Such tests are usually impractical and time consuming, and they have no relevance for the average consumer.
As for subjective digital video quality this is actually the viewer’s opinion on a video that has passed through processing. Normally, some parameters have to be followed, but there are other procedures available too, such as exposing a group of viewers to a sequence of images. Their opinions or reactions are then recorded and the average results from the evaluation of each sequence in particular. Regardless of the evaluation method, digital camera video quality is always superior to analog videos. And the quality is all the more relevant for larger visuals than for smaller ones.
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