Learn About Digital Video – anything about digital video

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. The problem comes from the fact that digital video quality can be distorted or impaired during processing, even if the incidence rate for deterioration is much lower as compared to analog videos for example. 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. When such data is introduced in a computer program, it can then be measured and reported objectively.

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, a trained expert should judge the parameters, yet it is common practice to take a group of experiments and show them several video sequences. Their opinions or reactions are then recorded and the average results from the evaluation of each sequence in particular. Normally, digital video quality is superior to analog videos because of the higher number of pixels. And the quality is all the more relevant for larger visuals than for smaller ones.