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Biometrics based personal identification techniques have intrinsic advantages over traditional personal identification techniques but the security of biometric data is a major issue. The biometric based verification system works properly only if the verification system can guarantee that the biometric data has come from the genuine person at the time of enrollment. We introduced application in which...
Abstract-In this work, we describe preliminary results re lated to an ultra-low power vision sensor, embedding contrast extraction and output data compression. The sensor performs less than 30 μW at 3.3 V and 30 frame/s, combining data compression together with event detection capabilities and efficient sensor interface. This makes the presented sensor to be suitable for energy-autonomous...
This paper describes an efficient hardware architecture for the deblocking filter used in H.264/AVC baseline profile video coding standard and optimized for real time implementation. Thus, the deblocking filter is a computationally and data intensive tool resulting in an increased execution time of both encoding and decoding processes. In fact, the processing order of the filter and the memory organization...
We propose a novel 8bpp subsampling YUV pattern based on a checkerboard subsampling of the luminance component that explicitly preserves the edge. The proposed pattern uses 1bit to encode edge direction in the missing luminance pixel and this bit is stored in the chroma sample as the chroma sample is DPCM encoded 8 to 7bits per sample. The complexity analysis of both encoder and decoder is concluded...
High-definition (HD) and super-high-definition (SHD) videos become more and more popular for various video applications, including video capture and playback on portable devices. Because of the resolution mismatch between HD/SHD video and the low resolution screen of portable devices, the video is fully decoded and then sown-sampled for the display, which causes a waste of both computational power...
H.264 video coding standard is widely used due to the high compression rate and quality. H.264 decoders usually have pipeline architecture by a macroblock or a 4 × 4 sub-block. The period of the pipeline is usually fixed to guarantee the operation in the worst case which results in many idle cycles and higher data bandwidth. We propose variable pipeline architecture for H.264 decoders for efficient...
This paper presents a study of the effect of resizing the image by using different interpolation methods on fractal image compression. This study is made to reduce the search time of matching between range block and domain block. The main drawback of fractal image compression is that it involves more computational time due to global search. In order to reduce the computational time with acceptable...
An efficient VLSI architecture of motion compensation of MPEG-4 is presented in this paper. Aiming at the memory accessing problem of the motion compensation, three special methods were adopted. First, a novel interpolation pixel buffering mechanism and the corresponding parallel interpolation structure were proposed to save the buffering storage consumption of the interpolation pixels distinctly...
In this paper, we propose a JND (Just Notice Distortion)-loss less image compression scheme that can improve the compression performance for JPEG-LS, while maintaining the image perceptual quality simultaneously. JND-loss less can be easily achieved by setting the quantization step size (QSS) to be double the JND value. However, dynamic JNDs make the coding of varying QSSs difficult and the JND estimated...
This paper presents a proposal for transmitting and recovering images using Multiple Description Coding (MDC) techniques over unreliable multiple links in a mesh network, while using network coding technique to add a protection path. In pure MDC, the loss of one description degrades the received image quality. In the proposed technique, the protection path ensures that all the descriptions are received...
It is proposed that an efficient and fast image compression scheme based on all level curvelet coefficients with SPIHT (Set Partitioning in Hierarchical Trees). For images with textures, the high frequency wavelet coefficients are likely to become significant after several code passes of SPIHT, which degrades the coding performance. The basic flaw that wavelet transform exhibits, is its inability...
In this paper a lossless compression scheme is presented. In this scheme we have compared our newly proposed model with lossless predictive code (LPC) and differential pulse code modulation (DPCM) and we have shown how our model is more advantageous than LPC and DPCM. This newly proposed scheme for Huffman coding will achieve higher compression as we have reduced the mean value of the pixel in the...
Image Vector Quantization (VQ) has many current applications, like speech and image compression, and envisioned applications, such as digital watermarking, data hiding and speaker identification. Given an image, VQ produce an index map by quantizing the image block by block. Recently, a loss less VQ index compression scheme, called Index Searching Algorithm with index Associated List (ISAIAL), was...
Recently, Distributed Video Coding (DVC) has been actively studied as a solution to the growing demands on light video encoder. However, DVC shifts the complexity from the encoder to the decoder side, and in some applications it needs unacceptably long decoding time and/or big computing power. In this paper, we propose a Wyner-Ziv (WZ) video coding which extracts fast moving regions called Region-Of-Interest...
Distributed video coding (DVC) is an interesting research topic for emerging application scenarios requiring low complexity video encoding. The central Slepian-Wolf (SW) coding, in a DVC system, exploits the cross correlation between the side information and the original frame. But, it does not exploit the source entropy of the input symbols, which is exploited by entropy coding in conventional video...
Transcoding is commonly used in media servers to adapt video bitstreams to capabilities and specifications of the receiving playback devices or the transmission network channel in between. Primary adjustments are done on the video format, the resolution and the bitrate. In this paper we propose utilizing transcoding as a means of converting a regular standard video bitstream to a standard video bitstream...
It is need to carry on the compression to the remote sensing image for the speedy transmission and the effective memory remote sensing image. The multi-spectrum remote sensing image has the very strong relevance among spectrums. In multi-wave band image compression, to eliminate the spectrum relevance, both must consider to eliminate the statistical dependence, and to eliminate the structure relevance...
Distributed video coding is a new paradigm for video compression based on the Slepian-Wolf and Wyner-Ziv theorems. Wyner-Ziv video coding, a lossy compression with receiver side information, enables low-complexity video encoding at the expense of a complex decoder. Most of the existing distributed video coding techniques require a feedback channel to determine the number of parity bits for decoding...
Transmission of compressed video over unreliable networks is vulnerable to errors and error propagation. Multi-hypothesis motion compensated prediction (MHMCP) which was originally developed to improve compression efficiency has been shown to have a good error resilience property. In this paper we improve the overall performance of MHMCP in packet loss scenarios by performing optimal mode switching...
In this paper, a new QR code binarization method is presented according to the QR code characteristic to improve the accuracy of QR code decoding in mobile image processing. The Sauvola's thresholding algorithm is modified to solve QR code image binarization which is the threshold decision in the uneven light condition. Experiments show that the proposed algorithm has better correctness of recognition...
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