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Chapter 15. Video Testing for Validation > Content-Based Coding Test

15.4. Content-Based Coding Test

To fulfill the MPEG-4 functionalities presented in Chapter 1, typical video frame-based coding was no longer enough; thus, the object-based data model was adopted for MPEG-4. Because encoding a video sequence as a composition of objects requires coding not only the texture but also shape data (see Chapter 8), it is important to know at which cost in terms of subjective quality come the content-based functionalities made possible by the independent coding of the video objects. This section describes the content-based coding test that had the target of comparing the subjective quality performance of MPEG-4 object-based coding regarding MPEG-4 frame-based coding.

15.4.1. Test Conditions

The MPEG-4 content-based coding test, performed in February 1999, targeted the comparison in terms of coding efficiency of an MPEG-4 video object-based encoder with an MPEG-4 video frame-based encoder, under the conditions specified in Table 15.3 [N2602, N2711]. Two ranges of bit rates were considered: The lower range was up to 384 kbit/s and the higher range was up to 1.15 Mbit/s. Table 15.3 lists some of the coding parameters used to produce the test sequences.


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