Digital Video Quality
When transferring and processing stored material from a camcorder disk to a computer, users often worry about the digital video quality. 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.
According to expert criteria, you can evaluate the digital video quality by analyzing different sequences from the database. From this perspective, the dynamic features of the input video signal with the motion and the spatial dimension influence the performance of a certain system. Thus, by working with mathematical models, you can determine digital video quality with a certain degree of approximation. 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. More tests are sometimes needed to determine the digital video quality for compression-decompression. The average consumer will never perform such time consuming tests; they are only used by professionals and strictly for specific tasks.
Besides the objective analysis of digital video quality, anyone can pass a subjective judgment. 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. 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.
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