Detlef Ruschin added div_It_is_often_necessary__.html  over 7 years ago

Commit id: 89f2f63f3caef8676025047570da0019420ed74f

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It is often necessary to characterize the technical  quality of an image in terms of the subjective impression it causes in a human  observer. Subjective image quality evaluation helps for example to rank codecs  with similar performance, or to decide whether it is worthwhile to increase the  amount of data spent for a given image file or bit stream.