1月9日,大疆推出了DJI O4 Air Unit系列旗舰级高清FPV数字图传设备,提供O4 Air Unit和O4 Air Unit Pro两个版本。DJI O4 Air Unit系列实现图传性能再次飞跃,带来了更高清、更低延时、更远距离的全新数字图传方案。DJI O4 Air Unit重量仅...1月9日,大疆推出了DJI O4 Air Unit系列旗舰级高清FPV数字图传设备,提供O4 Air Unit和O4 Air Unit Pro两个版本。DJI O4 Air Unit系列实现图传性能再次飞跃,带来了更高清、更低延时、更远距离的全新数字图传方案。DJI O4 Air Unit重量仅8.2克,搭载1/2英寸影像传感器,可拍摄4K/60fps视频。图传系统采用H.265视频编码,支持1080p/100fps高帧率传输,从而实现清晰、流畅的实时影像。展开更多
To overcome some drawbacks of Viterbi algorithm （VA）, such as exponential growing complexity of decoding, and its poor performance under bad channel conditions, some available known information must be used as cons...To overcome some drawbacks of Viterbi algorithm （VA）, such as exponential growing complexity of decoding, and its poor performance under bad channel conditions, some available known information must be used as constrained condition and apriori knowledge for decoding. A new constrained VA is proposed by adding con- straint bits directly for conventional codec. Compared with the conventional VA, under the bad channel condi- tion, the proposed scheme can improve the peak signal to noise ratio （PSNR） of the decoding image 2--10 dB by changing the number of constrained bits. Experimental results show that it is an efficient error-controlling way for the transmission of set partitioning in hierarchical trees （SPIHT） coded image.展开更多
文摘1月9日,大疆推出了DJI O4 Air Unit系列旗舰级高清FPV数字图传设备,提供O4 Air Unit和O4 Air Unit Pro两个版本。DJI O4 Air Unit系列实现图传性能再次飞跃,带来了更高清、更低延时、更远距离的全新数字图传方案。DJI O4 Air Unit重量仅8.2克,搭载1/2英寸影像传感器,可拍摄4K/60fps视频。图传系统采用H.265视频编码,支持1080p/100fps高帧率传输,从而实现清晰、流畅的实时影像。
文摘To overcome some drawbacks of Viterbi algorithm （VA）, such as exponential growing complexity of decoding, and its poor performance under bad channel conditions, some available known information must be used as constrained condition and apriori knowledge for decoding. A new constrained VA is proposed by adding con- straint bits directly for conventional codec. Compared with the conventional VA, under the bad channel condi- tion, the proposed scheme can improve the peak signal to noise ratio （PSNR） of the decoding image 2--10 dB by changing the number of constrained bits. Experimental results show that it is an efficient error-controlling way for the transmission of set partitioning in hierarchical trees （SPIHT） coded image.
