• Digital Video Quality: Knowing More about its Original Quality

    Date: 2010.02.15 | Category: Uncategorized | Tags: ,,,,

    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.

    Normally, according to expert criteria, digital video quality has to be evaluated on various video sequences from the original database. From this perspective, 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. 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.

    Peak-signal-to-noise ratio or simple signal-to-noise ratio are the traditional ways of determining digital video quality; 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. Such tests are usually impractical and time consuming, and they have no relevance for the average consumer.

    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. The evaluation is performed per sequence and the reactions and opinions are recorded for analysis. Regardless of the evaluation method, digital 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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