Filters








230 Hits in 5.1 sec

Lossy image compression based on prediction error and vector quantisation

Mohamed Uvaze Ahamed Ayoobkhan, Eswaran Chikkannan, Kannan Ramakrishnan
2017 EURASIP Journal on Image and Video Processing  
In this paper, a new lossy compression method denoted as PE-VQ method is proposed which employs prediction error and vector quantization (VQ) concepts.  ...  The performance of a lossy compression algorithm is evaluated based on two conflicting parameters, namely, compression ratio and image quality which is usually measured by PSNR values.  ...  Authors' contributions CE contributed towards the general framework of the proposed prediction based model for image compression.  ... 
doi:10.1186/s13640-017-0184-3 fatcat:snir2z3fjfh7fbz5q43jh7lfsq

Compressing Colour Images with Joint Inpainting and Prediction [article]

Rahul Mohideen Kaja Mohideen, Pascal Peter, Tobias Alt, Joachim Weickert, Alexander Scheer
2020 arXiv   pre-print
Inpainting-based codecs store sparse, quantised pixel data directly and decode by interpolating the discarded image parts.  ...  Such joint inpainting and prediction approaches yield good results with simple components such as regular grids and Shepard interpolation on grey value images, but they lack a dedicated mode for colour  ...  REVIEW: INPAINTING-BASED COMPRESSION WITH SCALAR QUANTISATION Inpainting At their core, all inpainting-based image compression codecs rely on interpolation from sparse image data.  ... 
arXiv:2010.09866v1 fatcat:aj67togiu5hk3ipcglz3cl4af4

Hybrid predictive/VQ lossless image coding

P.O. Ogunbona, J. Wang, G. Naghdy
1995 Electronics Letters  
The use of vector quantisation (VQ) for compression of the model coefficients leads to an improved compression ratio. Both image adaptive and universal codebooks are considered.  ...  A multiplicative autoregressive model is used in a lossless predictive image coding scheme.  ...  This Letter presents a new hybrid lossless image coding scheme based on the multiplicative autoregressive (MAR) model [6] and vector quantisation (VQ).  ... 
doi:10.1049/el:19950339 fatcat:tttxq2ypjra6plxazj5rtpghgy

Effective compression of hyperspectral imagery using an improved 3D DCT approach for land-cover analysis in remote-sensing applications

Tong Qiao, Jinchang Ren, Meijun Sun, Jiangbin Zheng, Stephen Marshall
2014 International Journal of Remote Sensing  
An improved 3D Discrete Cosine Transform (DCT) based approach is proposed, where a Support Vector Machine (SVM) is applied to optimally determine the weighting of inter-band correlation within the quantisation  ...  In this paper, we focus on quality-assured lossy compression of HSI, where the accuracy of analysis from decoded data is taken as a key criterion to assess the efficacy of coding.  ...  Consequently, a new method based on Kronecker-product gain-shape vector quantisation (Canta and Poggi 1998) was proposed for very low bit rate encoding of multispectral and hyperspectral images.  ... 
doi:10.1080/01431161.2014.968682 fatcat:6frp7nuwaffwjaa4hnlal5eute

A survey on video compression fast block matching algorithms

Abir Jaafar Hussain, Zaynab Ahmed
2019 Neurocomputing  
The practical and widely method used to carry out motion compensated prediction is block matching algorithm.  ...  This will carry out displacement vectors that stipulate the movement of the macroblocks from one location to another in the reference frame.  ...  This frame is compressed as a still image using a still image compression technique such as transform coding, vector quantisation or entropy coding.  ... 
doi:10.1016/j.neucom.2018.10.060 fatcat:vh2duiml2ffjrim6g7v5kduhym

Near-lossless image compression by relaxation-labelled prediction

Bruno Aiazzi, Luciano Alparone, Stefano Baronti
2002 Signal Processing  
The proposed method is based on a classiÿed linear-regression prediction followed by context-based arithmetic coding of the outcome residuals.  ...  Images are partitioned into blocks, typically 8 × 8, and a minimum mean square error linear predictor is calculated for each block.  ...  Alba for his foresight and constructive e orts to apply fuzzy-logic techniques to data compression.  ... 
doi:10.1016/s0165-1684(02)00305-5 fatcat:xxbhx3lw5zhg7m3zd4ls3rpwwi

Lossy and lossless image encoding using multi-scale recurrent pattern matching

Danillo Bracco Graziosi, Murilo B. de Carvalho, Sérgio Manuel Maciel de Faria, Nuno Miguel Rodrigues, Eduardo A.B. da Silva
2013 IET Image Processing  
In this work, the authors evaluate MMP's lossless compression capability, proposing modifications for some of its predictions modes, as well as the inclusion of an adaptive prediction mode based on least  ...  and rates, from lossy to lossless, without any prior analysis of the image to be coded.  ...  Instead of the traditional transform-quantise-encode procedure, MMP exploits an encoding paradigm based on dictionary search for its residue encoding.  ... 
doi:10.1049/iet-ipr.2012.0538 fatcat:h2byanidpnaphjmh52754pixhy

Enhanced Computation Time for Fast Block Matching Algorithm

Zaynab Ahmed, Abir Jaafar Hussain, Dhiya Al-Jumeily
2011 2011 Developments in E-systems Engineering  
This will carry out displacement vectors that stipulate the movement of the macroblocks from one location to another in the reference frame.  ...  Recent studies on video compression have focused on multimedia transmission, videophones, teleconferencing, high definition television (HDTV), CD-ROM storage, etc.  ...  This frame is compressed as a still image using a still image compression technique such as transform coding, vector quantisation or entropy coding.  ... 
doi:10.1109/dese.2011.8 dblp:conf/dese/AhmedHA11 fatcat:jjnr7jaxd5gann2ey3k6tyjoh4

Improving Wyner-Ziv Video Coding By Block-Based Distortion Estimation

Zouhair Belkoura, Thomas Sikora
2006 Zenodo  
We propose here to incorporate into the Wyner-Ziv codec: nonadaptive predictive coding and deadzone quantisation on a blocklevel.  ...  CONCLUSIONS AND OUTLOOK We have combined turbo coder based Wyner-Ziv video coding with modified predictive coding on a block level.  ... 
doi:10.5281/zenodo.52903 fatcat:j64yucduhrehblxh6vg2man37a

Image compression based on genealogical relation of the TSVQ indices

Jamshid Shanbehzadeh, Philip O. Ogunbona, Abdolhosain Sarafzadeh, C.-C. Jay Kuo, Shih-Fu Chang, Sethuraman Panchanathan
1998 Multimedia Storage and Archiving Systems III  
The indices obtained by tree-structured vector quantisation (TSVQ) have an interesting property that enables them to give information about the correlation between two image blocks.  ...  ABSTRACT The indices obtained by tree-structured vector quantisation (TSVQ) have an interesting property that enables them to give information about the correlation between two image blocks.  ...  This method compresses the indices of quantised images based on the fact that neighboring blocks, in natural images, are highly correlated, and this correlation exhibits itself among the indices ofneighboring  ... 
doi:10.1117/12.325840 fatcat:ccfndexpuba3hfkoajsj6z73ky

Affine-structure-based facial image encoding

Shoma Chatterjee, Subhashis Banerjee, K. K. Biswas
1999 IEE Proceedings - Vision Image and Signal Processing  
Any remaining reconstruction error is accounted for using predictive encoding. Results on real image sequences demonstrate the applicability of the method.  ...  For accurate motion and structure estimation a Kalmanfilter-based algorithm is used to track features on the facial image.  ...  GOP=8 GOP = 25 GOP = 50 T -error threshold for predictive encoding In Figs. 13-17 and Fig. 15 15 Mean square error between the original and reconstructed frames for different quantisation sizes Q GOP  ... 
doi:10.1049/ip-vis:19990513 fatcat:aersdhk3tbejfeopfnfhej72iu

Depth Sequence Coding with Hierarchical Partitioning and Spatial-domain Quantisation

Shampa Shahriyar, Manzur Murshed, Mortuza Ali, Manoranjan Paul
2019 IEEE transactions on circuits and systems for video technology (Print)  
For mono-view coding of standard MVD test sequences, on average, (i) lossless BTBD achieved ×42.2 compression-ratio and −60.0 % coding gain against the pseudo-lossless 3D-HEVC, using the lowest quantisation  ...  It preserves edges implicitly by limiting quantisation to the spatial-domain and exploits clustering tendency efficiently at frame-level with a novel binary tree based decomposition (BTBD) technique.  ...  Thus, reuse of texture motion vectors is not guaranteed to achieve optimal rate-distortion performance [7] . 3) EAT based approach: Maitre and Do [29] proposed a depth map compression scheme based on  ... 
doi:10.1109/tcsvt.2019.2897403 fatcat:hhbbj37z5bhy7eobykzkza33lu

Shape-VQ-based lossless hybrid ADPCM/DCT coder

J. Wang, G. Naghdy
2000 IEE Proceedings - Vision Image and Signal Processing  
The proposed scheme divides each input image into small blocks and classifies them, using shape vector quantisation (VQ), as either edge or smooth.  ...  The proposed scheme divides each input image into small blocks and classifies them, using shape vector quantisation (VQ), as either edge or smooth.  ...  The shape-vector is then vector quantised. A code vector is found for A based on the nearest-neighbour rule.  ... 
doi:10.1049/ip-vis:20000399 fatcat:sgch5cyjtfbvhni3llfxdpdj34

Depth Sequence Coding with Hierarchical Partitioning and Spatial-domain Quantisation [article]

Shampa Shahriyar, Manoranjan Paul Federation University Australia
2018 arXiv   pre-print
For mono-view coding of standard MVD test sequences, on average, (i) lossless BTBD achieved × 42.2 compression-ratio and -60.0% coding gain against the pseudo-lossless 3D-HEVC, using the lowest quantisation  ...  It preserves edges implicitly by limiting quantisation to the spatial-domain and exploits clustering tendency efficiently at frame-level with a novel binary tree based decomposition (BTBD) technique.  ...  Thus, reuse of texture motion vectors is not guaranteed to achieve optimal rate-distortion performance [7] . 3) EAT based approach: Maitre and Do [29] proposed a depth map compression scheme based on  ... 
arXiv:1801.02298v1 fatcat:z6p6leedt5f3xhz7t44jtp5gcu

Developing a Video Steganography Toolkit [article]

James Ridgway, Mike Stannett
2014 arXiv   pre-print
Although techniques for separate image and audio steganography are widely known, relatively little has been described concerning the hiding of information within video streams ("video steganography").  ...  In this paper we review the current state of the art in this field, and describe the key issues we have encountered in developing a practical video steganography system.  ...  In section 1.4 we saw how coefficient-based transforms such as DCT can be used to represent an image, and these techniques can be used to assist the image compression process.  ... 
arXiv:1409.4883v1 fatcat:xgagbm52dfhwfmi5nfrcrmk6au
« Previous Showing results 1 — 15 out of 230 results