Test sequences are defined according to the picture size and applications and they are classified into six classes (class A to class F). Class A is the set of sequences with higher resolution than 1080p HDTV. The sequences are used to evaluate the coding performance of 4K/8K video. To reduce computation time, picture sizes are cropped to 2,560 x 1,600 pixels. Class B is for coding performance evaluation of 1080p HDTV and the set contains HDTV sequences, with a picture size of 1,920 x 1,080 pixels. Classes C and D are the set of test sequences with picture sizes of 832 480 pixels and 416 x 240 pixels, respectively. Test sequences in these two classes are for coding performance evaluation of mobile applications. Class E is the set of test sequences with a picture size of 1,280 x 720 pixels. It is used to evaluate coding performance of low-latency applications such as visual communications. CTC, in addition, defines class F sequences for coding performance evaluation of non-camera captured content such as video screen content, containing, for example, text and computer graphic
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