Low-complexity and low-bit-rate image compression scheme based on absolute moment block truncation coding

2003 ◽  
Vol 42 (7) ◽  
pp. 1964 ◽  
Author(s):  
Yu-Chen Hu
Keyword(s):  
Image Compression ◽  
Low Complexity ◽  
Bit Rate ◽  
Absolute Moment ◽  
Compression Scheme ◽  
Block Truncation Coding ◽  
Low Bit Rate

scholarly journals An Efficient Image Compressor for Charge Coupled Devices Camera

2014 ◽  
Vol 2014 ◽  
pp. 1-20 ◽  
Author(s):  
Jin Li ◽  
Fei Xing ◽  
Zheng You
Keyword(s):  
Remote Sensing ◽  
Wavelet Transforms ◽  
Ccd Camera ◽  
Low Complexity ◽  
Remote Sensing Image ◽  
Discrete Wavelet ◽  
Bit Rate ◽  
Compression Scheme ◽  
Low Bit Rate ◽  
Charge Coupled Devices

Recently, the discrete wavelet transforms- (DWT-) based compressor, such as JPEG2000 and CCSDS-IDC, is widely seen as the state of the art compression scheme for charge coupled devices (CCD) camera. However, CCD images project on the DWT basis to produce a large number of large amplitude high-frequency coefficients because these images have a large number of complex texture and contour information, which are disadvantage for the later coding. In this paper, we proposed a low-complexity posttransform coupled with compressing sensing (PT-CS) compression approach for remote sensing image. First, the DWT is applied to the remote sensing image. Then, a pair base posttransform is applied to the DWT coefficients. The pair base are DCT base and Hadamard base, which can be used on the high and low bit-rate, respectively. The best posttransform is selected by thelp-norm-based approach. The posttransform is considered as the sparse representation stage of CS. The posttransform coefficients are resampled by sensing measurement matrix. Experimental results on on-board CCD camera images show that the proposed approach significantly outperforms the CCSDS-IDC-based coder, and its performance is comparable to that of the JPEG2000 at low bit rate and it does not have the high excessive implementation complexity of JPEG2000.

Advanced Information Hiding for G.711 Telephone Speech

2013 ◽  
pp. 129-163 ◽  
Author(s):  
Akinori Ito ◽  
Yôiti Suzuki
Keyword(s):  
Data Hiding ◽  
Side Information ◽  
Low Complexity ◽  
Speech Quality ◽  
Rate Data ◽  
Bit Rate ◽  
Bandwidth Extension ◽  
Low Bit Rate ◽  
Speech Codec ◽  
Popular Speech

G.711 is the most popular speech codec for Voice over IP (VoIP). This chapter proposes a method for embedding data into G.711-coded speech for conveying side information for enhancing speech quality such as bandwidth extension or packet loss concealment. The proposed method refers to a low-bit rate encoder to determine how many bits are embedded into each sample. First, a variable-bit rate data hiding method is proposed as a basic framework of the proposed method. Then, the proposed method is extended to achieve fixed bit rate data hiding. According to comparison experiments, the proposed method is proved to achieve higher speech quality compared with the conventional method. Moreover, the authors developed a low-complexity speech bandwidth extension method that uses the proposed data hiding method.

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