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The visual quality obtained in wireless transmission strongly depends on the characteristics of the wireless channel and on the error resilience of the source coding. The wireless extensions of the JPEG 2000 standard (JPWL) and H.264 are the latest international standards for still image and video compression, respectively. However, few results have been reported to compare the rate-distortion (R-D)...
In this paper, we propose an adaptive resource management scheme for end-to-end image transmission over wireless channel. Our goal is to minimize the total system energy consumption according to varying channel conditions and input image characteristics. In our proposed scheme, system resources are allocated among source coder, channel coder, and transmission amplifier. Moreover, unequal transmission...
The great advances in wireless communication networks have led to high desire for a strong digital data transmission. However, illegal data access has become more easy and prevalent in wireless networks. In order to protect valuable data from undesirable readers, data encryption has become a critical issue. However, encryption techniques do not take into account wireless network characteristics such...
Images transmitted over unreliable channels are highly prone to errors. Produces distortion in transmitted images is usually repaired using post processing techniques called error concealment. Error concealment techniques provide a simple framework to compensate the produced distortions without incurring additional delays and wasting bandwidth resources which are crucial for real-time applications...
In this paper, we consider the problem of joint source-channel coding for image progressive transmitted over channels with feedback. Feedback routes are provided in many existing standard wireless channels, making rate allocation with feedback a problem of considerable practical importance. We address the question of rate allocation between the source and channel codes in the forward channel, in the...
In this paper, a low-complexity power allocation scheme for M-QAM is proposed with no need for feedback of channel state information. The Optimization is based on bit power allocation according to the importance of bits to the overall image quality. An iterative off-line algorithm is presented to find the optimum power and modulation level allocated to different bits. Our results show that the proposed...
Transmissions over wireless and other unreliable networks can lead to packet loss. An area that has received limited research attention is how to tailor multimedia information taking into account the way packets are lost. We provide a brief overview of our research on designing a 3D perceptual quality metric integrating two important factors, resolution of texture and resolution of mesh, which control...
In order to improve error resilient ability and transmission efficiency for image transmission over wireless channels, a joint source channel coding (JSCC) scheme was proposed in this paper, in which adaptive image segmentation and irregular low-density parity check (LDPC) was fitted together. At first, an adaptive image segmentation method according to the pixel intensity was designed to segment...
It has been proved that low-density parity-check (LDPC) codes is good codes and have good distance. They have near Shannon limit performance when decoded using an iterative probabilistic algorithm. Moreover, high-rate LDPC codes have high data rate and high spectral efficiency. So, in this paper, we explored three high-rate LDPC codes in image transmission over Rayleigh fading channel, the simulation...
Low-density parity-check (LDPC) codes have near Shannon performance and easy to implement, multicarrier modulation can achieve high spectral efficiency and resist the inter-symbol interference (ISI). In this paper, we explored three high rate LDPC codes in image transmission with multicarrier modulation. The simulation results show that the combination of multicarrier modulation and high rate LDPC...
Multimedia applications involving the transmission of video over communication networks are rapidly increasing in popularity. Such applications can greatly benefit from adapting video coding parameters to network conditions as well as adapting network parameters to better support the application requirements. These two dimensions can both be viewed as allocating source and network resources to improve...
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