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제안 방법
- A second experiment was conducted to analyze the quality of the active region and DEHA upon reconstruction of the compressed video stream that included block mode DEHA. Results revealed an overall quality improvement of the active region, as shown in Table 5, Figure 7, and Figure 8.
- Table 4 shows that the average generated bits of macroblock with DEHA vary according to the video stream rate of each sequence. According to the theoretical expectations of the proposed method, the average generated bit results were smaller than conventional methods in four sequences; namely, Tractor, Controlled Burn, Speed Bag, and Touchdown Pass. In general, the black mode generated the smallest amount of bits per sequence while the proposed method generating bit results more closely aligned with the black mode than the reference mode.
- However, despite its essential function, the DEHA is currently viewed as being redundant in terms of channel utilization and storage efficiency. Hence, a core purpose of this research is to examine and propose methodology to more effectively utilize the DEHA, which has not been researched to date. Notably, this paper proposes a block mode DEHA method to replace the conventional use of DEHA, an improved method that reduces the amount of DEHA data in the compressed video stream, and consequently, improves the quality of the active video.
- Hence, a core purpose of this research is to examine and propose methodology to more effectively utilize the DEHA, which has not been researched to date. Notably, this paper proposes a block mode DEHA method to replace the conventional use of DEHA, an improved method that reduces the amount of DEHA data in the compressed video stream, and consequently, improves the quality of the active video.
- Seven test sequences based on the Taurus Media Technik and eight real sequences based on the NTIA/ITS for video quality research were used to evaluate the proposed method [4-5]. The resolution of each sequence was progressive at a resolution of 1920×1080 and frame rates of 25frames/sec and 29.
- This paper has proposed a block mode DEHA method to more effectively utilize the DEHA, based on the underlying assumption that the quality of active video can be improved by reducing the amount of DEHA data in the compressed video stream through improved channel utilization and storage efficiency. The proposed block mode DEHA achieves this assumption by partitioning video block images, including the DEHA, into macroblocks, of which the representative DEHA macroblocks are then evenly filled with the average DC coefficient of the active video macroblock. Theoretically, this process results in no DEHA data entering the video stream.
- This paper has proposed a block mode DEHA method to more effectively utilize the DEHA, based on the underlying assumption that the quality of active video can be improved by reducing the amount of DEHA data in the compressed video stream through improved channel utilization and storage efficiency. The proposed block mode DEHA achieves this assumption by partitioning video block images, including the DEHA, into macroblocks, of which the representative DEHA macroblocks are then evenly filled with the average DC coefficient of the active video macroblock.
- This paper proposes a block mode DEHA method to more effectively utilize the DEHA as compared to conventional DEHA utilization. The block mode DEHA method is based on reducing the amount of DEHA data in the compressed video stream, which can improve the quality of the active video, by partitioning the DEHA as macroblocks.
- To analyze the effects of the proposed DEHA method based on block mode DEHA, an experiment was conducted using MPEG CBR compression to compare the generated bits per frame from the proposed method against the conventional, reference method. The test results confirmed that the effects of the block mode DEHA method on the rate control were minimal as compared to the reference method, as shown in Table 4 and Fig 5.
- To summarize, as shown in this experiment of diverse test sequences, the video quality of DTV broadcasting can be improved in excess of 0.010dB through effective utilization of the DEHA, based on the block mode DEHA method. Moreover, a key advantage of the proposed block mode DEHA is its simplicity and implementation ease, as compared to the time, resources, and effort required to develop new video encoding theory or algorithms.
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