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检索条件"主题词=Block truncation coding"

共 169 条记录，以下是61-70 订阅

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In-network Data Compression in Wireless Sensor Networks Using Distributed block truncation coding 2

In-network Data Compression in Wireless Sensor Networks Usin...

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2nd International Conference on Advances in Electronics, Computers and Communications (ICAECC)

作者： Thomas, Sanu Mathew, Thomaskutty Sch Technol & Appl Sci Dept Comp Sci Kottayam Kerala India Sch Technol & Appl Sci Dept Elect Kochi Kerala India

ISBN: (纸本)9781538637852

In-network data compression is achieved in a wireless sensor network using block truncation coding technique. This provides data compression and the consequent energy saving. In block truncation coding, binarization and fixing of quantization levels are the two major steps. By shifting the binarization pre-processing to the sensor nodes, in-network compression is realized.

关键词： block truncation coding data compression binarization compression ratio in-network data compression key frames inter frames

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Optimizing the Performance of Halftoning-Based block truncation coding 10

Optimizing the Performance of Halftoning-Based Block Truncat...

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10th Asia-Pacific-Signal-and-Information-Processing-Association Annual Summit and Conference (APSIPA ASC)

作者： Xu, Zi-Xin Chan, Yuk-Hee Lun, P. K. Daniel Hong Kong Polytech Univ Dept Elect & Informat Engn Hong Kong Peoples R China Chengdu Univ Informat Technol Coll Elect Engn Chengdu Sichuan Peoples R China

ISBN: (纸本)9789881476852

block truncation coding (BTC) is an effective lossy image coding technique that enjoys both high efficiency and low complexity especially when halftoning techniques are employed to shape the noise spectrum of its output. However, due to its block-based nature, blocking artifacts are commonly found in the coding outputs. Post-processing schemes are generally applied to soften the problem. Recently, a halftoning-based BTC algorithm was proposed to solve this problem by eliminating the cause of blocking artifacts. In this paper, through an optimization step, the performance of the algorithm is optimized in terms of a given objective measure. The idea can be adopted to work with other halftoning methods to optimize other measures for suiting different needs in different circumstances.

关键词： blocking effects block truncation coding halftoning optimization

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Reversible Data Hiding for block truncation coding Compressed Color Images 10

Reversible Data Hiding for Block Truncation Coding Compresse...

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10th International Conference on Graphics and Image Processing (ICGIP)

作者： Fang, Hai Zhou, Quan China Acad Space Technol Xian Xian 710100 Shaanxi Peoples R China Natl Key Lab Sci & Technol Space Microwave Xian 710100 Shaanxi Peoples R China

ISBN: (数字)9781510628298

ISBN: (纸本)9781510628298

In this paper, a reversible data hiding method aims at block truncation coding compressed color images is proposed, which can reconstruct the original compressed image effectively after extracting the embedded secret data. In order to improve the compression quality, a mean absolute deviation based clustering is applied to find an approximate optimal common bitmap. The common bitmap is used to get the quantization levels of each block in each color channel. The secret data are then embedded in the quantization levels of each block by the histogram shifting method and quantization level patterns based method. Experimental results show that the proposed method outperforms the existing reversible data hiding methods for BTC-compressed color images in terms of hiding capacity and visual quality.

关键词： color image compression block truncation coding reversible data hiding histogram shifting

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A Chaotic Searchable Image Encryption Scheme Integrating with block truncation coding 4th

A Chaotic Searchable Image Encryption Scheme Integrating wit...

引用

4th International Conference on Cloud Computing and Security (ICCCS)

作者： Jiang, Mingfang Sun, Guang Hunan First Normal Univ Dept Informat Sci & Engn Changsha 410205 Hunan Peoples R China Hunan Univ Finance & Econ Res Inst Finance & Econ Big Data Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9783030000127;9783030000110

In order to provide secure retrieval for encrypted digital images in cloud-based system, a secure searchable image encryption algorithm based on block truncation coding (BTC) and Henon chaotic map is presented. Henon Chaotic map is used to encrypt two quantization levels of BTC compressed images, and a pseudo random sequence is created by chaotic map to scramble the bit plane of each sub-block. The feature value of each sub-block is computed according to the relationship between the number of 1s and 0s in the corresponding bit plane. The encrypted image retrieval can be achieved by comparing the normalized correlation coefficients between the feature vectors. Experimental results show that the proposed scheme has satisfactory retrieval accuracy and security. Meanwhile, it has low computational cost and can be used for encrypted images retrieval in the cloud.

关键词： Searchable image encryption Henon chaotic map block truncation coding

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HYBRID block truncation coding FOR COLOR IMAGE COMPRESSION

HYBRID BLOCK TRUNCATION CODING FOR COLOR IMAGE COMPRESSION

引用

IEEE International Conference on Network Infrastructure and Digital Content

作者： Wang, Jun Jeung, Yeun-Cheul Chong, Jong-Wha Hanyang Univ Dept Elect & Comp Engn Seoul 133791 South Korea

ISBN: (纸本)9781424448982

In this paper, a hybrid block truncation coding (HBTC) is presented for color image compression. In the HBTC algorithm to improve the compression ratio of the basic BTC, only luminance bit-map is employed to represent the edge information of the coding block. Moreover, ail efficient previous proposed algorithm, adaptive quantization coding, (AQC), is used to compress the two representative levels further. Simulation results show that the proposed HBTC performs as well as the BTC in terms Of Subject Visual quality, and significantly improves the compression ratio of BTC from 2.88:1 to 6.00:1 with the limited performance losing about 0.66dB in PSNR.

关键词： block truncation coding color image compression adaptive quantization coding

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Adaptive Bit Plane Quadtree-based block truncation coding for Image Compression 9

Adaptive Bit Plane Quadtree-based Block Truncation Coding fo...

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9th International Conference on Graphic and Image Processing (ICGIP)

作者： Li, Shenda Wang, Jin Zhu, Qing Beijing Univ Technol Fac Informat Technol Beijing Peoples R China Beijing Key Lab Internet Culture & Digital Dissem Beijing Peoples R China

ISBN: (数字)9781510617421

ISBN: (纸本)9781510617421

block truncation coding (BTC) is a fast image compression technique applied in spatial domain. Traditional BTC and its variants mainly focus on reducing computational complexity for low bit rate compression, at the cost of lower quality of decoded images, especially for images with rich texture. To solve this problem, in this paper, a quadtree-based block truncation coding algorithm combined with adaptive bit plane transmission is proposed. First, the direction of edge in each block is detected using Sobel operator. For the block with minimal size, adaptive bit plane is utilized to optimize the BTC, which depends on its MSE loss encoded by absolute moment block truncation coding (AMBTC). Extensive experimental results show that our method gains 0.85 dB PSNR on average compare to some other state-of-the-art BTC variants. So it is desirable for real time image compression applications.

关键词： image compression block truncation coding hierarchical decomposition adaptive bit plane

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ADAPTIVE block truncation coding IMAGE COMPRESSION TECHNIQUE USING OPTIMIZED DOT DIFFUSION 23

ADAPTIVE BLOCK TRUNCATION CODING IMAGE COMPRESSION TECHNIQUE...

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23rd IEEE International Conference on Image Processing (ICIP)

作者： Liu, Yun-Fu Guo, Jing-Ming Cheng, Yu Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei Taiwan

ISBN: (纸本)9781467399616

block truncation coding (BTC) has been considered as a highly efficient compression technique for decades, but the blocking artifact is its main issue. The halftoning-based BTC has significantly eased this issue, yet an apparent impulse noise artifact is accompanied. In this study, an improved BTC, termed adaptive dot-diffused BTC (ADBTC), is proposed to further improve the visual quality. Also, this method provides an additional flexibility on the compression ratios determination in contrast to the former fixed and few number of configuration possibilities. As documented in the experimental results, the proposed method achieves the superior image quality regarding the five various objective IQA methods. As a result, it is a very competitive approach for the needs of both high frame rate and high-resolution image compression.

关键词： Image compression block truncation coding optimization halftoning dot diffusion

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Improved block truncation coding using Optimized Dot Diffusion

Improved Block Truncation Coding using Optimized Dot Diffusi...

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International Symposium on Circuits and Systems Nano-Bio Circuit Fabrics and Systems (ISCAS 2010)

作者： Guo, Jing-Ming Liu, Yun-Fu Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei Taiwan

ISBN: (纸本)9781424453092

block truncation coding (BTC) has been considered as a highly efficient compression technique for decades. However, the annoying blocking effect and false contour under low bit rate configuration are its key problems. In this work, an improved BTC, namely Dot-Diffused BTC (DDBTC), is proposed to solve these problems. On one hand, the DDBTC can provide excellent processing efficiency by exploiting the innate parallelism advantage of dot diffusion. On the other hand, the DDBTC can provide excellent image quality by co-optimizing the class matrix and diffused matrix of the dot diffusion. The experimental results demonstrate that the proposed DDBTC is fully superior to the pervious Error-Diffused BTC (EDBTC) in terms of image quality and processing efficiency, and has much better image quality than that of the Ordered-Dither BTC (ODBTC).

关键词： block truncation coding dot diffusion digital halftoning image compression error diffusion ordered dithering

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An Efficient Quadtree-based block truncation coding for Digital Image Compression 30

An Efficient Quadtree-based Block Truncation Coding for Digi...

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IEEE 30th International Conference on Advanced Information Networking and Applications (IEEE AINA)

作者： Yang, Fu-Jhong Chen, Pei-Yin Hsu, Chih-Ling Lien, Chih-Yuan Natl Cheng Kung Univ Dept Comp Sci & Informat Engn Tainan Taiwan Natl Kaohsiung Univ Appl Sci Dept Elect Engn Kaohsiung Taiwan

ISBN: (纸本)9781509024612

The block truncation coding (BTC) is a simple and important technique to compress the digital image data. In this paper, we introduce our image compression method utilizing quadtree decomposition. In order to reduce bit rate and blocking effect, we apply the error diffusion technique. Our extensive experimental results show that the proposed method obtains excellent performances in terms of quantitative evaluation and visual quality.

关键词： block truncation coding image compression error diffusion

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Content Based Image Retrieval using Dither block truncation coding with similarity comparison algorithm 1

Content Based Image Retrieval using Dither Block Truncation ...

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International Conference on Computer Communications and Electronics (Comptelix)

作者： Yadav, Pradeep Gupta, Rishi Kumar, Sandeep Jagannath Univ Jaipur Rajasthan India

ISBN: (纸本)9781509047086

The main aim of this paper is to reduce the computational time, to increase the complexity ratio and to improve the image quality by applying dither Dither block truncation coding algorithm with different similarity comparison algorithm, as different approaches are followed to improve the quality of an image, ODBTC is one of the approach, but to improve the quality we will also include some of the best similarity measurement algorithm like normalized and mini-max ratio, on the other hand feature selection is also one of the important factor to improve the performance measurement, previously we were using color(CF) and bit pattern(BF) separately but here we will combine both color with bit pattern(CBF)feature so more improved result will occur.

关键词： block truncation coding Order Dither block truncation coding and euclidean distance measurement algorithm

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