To solve the problem of emitter separation under complex electromagnetic environment, a signal separation method based on multi-level digital channelization is proposed in this paper. A two-level structure which can divide signal into different channel is designed first, after that, the peaks of different channels are tracked using the track filter and the coincident signals in time domain are separated in time-frequency domain. Finally, the time domain waveforms of different signals are acquired by reverse transformation. The validness of the proposed method is proved by experiment.
Motion estimation has been shifted from encoder to the decoder in distributed video coding (DVC). In this paper, a simplified skip mode is introduced in the WZ (Wyner-Ziv) frame coding process. In the proposed scheme, a skip mode decision process is performed to determine whether to apply skip mode to the blocks with low motion first. With the skip-mode, the block is reconstructed from the side information in the decoder without any encoding bits. In addition, the
non-skip mode blocks are divided into two parts by motion activity. The encoding bitplane is extracted within each set and encoded independently. Simulations show the proposed scheme can achieve up to 54.29% bitrate savings without visible PSNR sacrifice
A novel compression method for interferential multispectral images based on distributed source coding is proposed.
Slepian-Wolf and Wyner-Ziv theorems on source coding with side information are taken as the basic coding principles.
In our system, a rate control solution is proposed to avoid the feedback channel used in many practical distributed source
coding solutions. The residual statistics between corresponding coefficients in original frame and the side information
frame is assumed to be modeled by Laplacian distribution. We estimate the distribution parameter on line at the encoder
at subband levels. The experimental results show that our method outperforms significantly over JPEG2000, especially at
medium and low bit rates, the method can obtain about 5dB gains than JPEG2000, and the subjective quality is obviously