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For each video sequence, 15 distorted versions are present, with four types of distortion: wireless distortion, IP distortion, H.264 compression, MPEG-2 compression.
This includes optical and satellite channels with various types of distortion.
The peak total pressure and swirl distortion events are found to be not synchronous, which highlights the need to assess both types of distortion.
Table 2 shows the performance of the proposed FR-PWN and NR-PWN metrics using images with different types of distortion as provided by the TID2008 database [22].
The synthesis process changes the pixels position in the synthesized image and induces new types of distortion in DIBR-synthesized views.
Three types of distortion (smeared, light twist and strong twist) have very low numbers of marks with sufficient evidential value assessed by either experts or EVA.
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Multiply-distorted images, that is, distorted by different types of distortions simultaneously, are so common in real applications.
The images are distorted using 17 types of distortions, including additive Gaussian noise, high-frequency noise, JPEG2000, and Gaussian blur.
However, most of the conventional NR-IQA methods are designed only for one or a set of predefined specific image distortion types, which are unlikely to generalize for evaluating image/video distorted with other types of distortions.
TID2008 database contains 1700 distorted images and 17 different types of distortions.
There are a total 886 distorted images generated from six types of distortions with 4-5 corresponding levels per image.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com