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. Some applications even require an evaluation of the digital video quality.
According to expert criteria, you can evaluate the digital video quality by analyzing different sequences from the 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; multimedia applications use both types of services for very practical and relevant results. 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.
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 camera video quality is superior to analog videos because of the higher number of pixels. And you can tell the difference a lot better when exposed to a larger visual.
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