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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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block truncation coding-based Audio Compression Technique 2018

Block Truncation Coding-based Audio Compression Technique

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2nd International Conference on Digital Signal Processing (ICDSP) / International Conference on Computer Graphics and Virtuality (ICCGV)

作者： Dacles, Mark Daniel I. Daga, Ryan Rey M. Univ Philippines Visayas Tacloban Coll Tacloban City Leyte Philippines

ISBN: (纸本)9781450364027

There have been an increasing utilization and consumption of audio files in various applications across different desktop and mobile devices. Thus, audio data compression has been beneficial in reducing the bandwidth and disk space requirements of such data. block truncation coding (BTC), a well-known data compression technique for digital images, was used as the underlying algorithm in encoding audio data. A new encoding technique for audio data was proposed with the following components: (1) quadtree for audio block segmentation, (2) AMBTC for computation of representative values, and (3) Huffman coding for lossless data representation. The performance of the proposed encoding technique was benchmarked and measured using Peak Signal-to-Noise Ratio (PSNR) and compression rate.

关键词： Audio data compression block truncation coding quadtree Huffman coding

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AN EFFICIENT HYBRID FEATURE FOR EDGE-PRESERVING BASED ON block truncation coding AND TREE-STRUCTURED VECTOR QUANTIZATION WITH EDGE ORIENTATION CLASSIFICATION OF BIT-PLANES

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INTERNATIONAL JOURNAL OF INNOVATIVE COMPUTING INFORMATION AND CONTROL 2018年第3期14卷 929-946页

作者： Feng, Ya-Pei Lu, Zhe-Ming Zhejiang Univ Sch Aeronaut & Astronaut 38 Zheda Rd Hangzhou 310027 Zhejiang Peoples R China

In this paper, we propose a hybrid feature which merges block truncation coding (BTC) and Tree-Structured Vector Quantization (TSVQ) with classification of edge orientation bit-planes. BTC is known for its high quality of reconstructed images, much lower computational complexity and low compression ratios. Vector Quantization (VQ), on the other hand, results in very high compression ratios but with high complexity. To solve these problems, we propose an improved approach for feature extraction based on bit-plane classification according to the Edge Orientation of the Bit-Plane (EOBP) templates and combine it with TSVQ. As different areas of the image have different activities and contrasts, we encode the active blocks containing edges with BTC and EOBP templates, and encode the inactive blocks having low intensity variations between its pixels with the VQ. Different from the original BTC and VQ based feature extraction, we extract the edge orientation information by applying the EOBP classification on the bit-plane image blocks, as a result that we classify image blocks into 28 kinds with different edges. Simulation results show that our proposed method performs better in image compression and image retrieval.

关键词： block truncation coding VQ Feature extraction Edge Orientation of the Bit-Plane (EOBP) templates

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Visual Quality Improvement for Ordered Dither block truncation coding

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电脑学刊 2019年第1期30卷 15-22页

作者： Chyi-Hwa Chu

Ordered dither block truncation coding (ODBTC) employs the ordered dither technique to produce the bitmap required in traditional block truncation coding (BTC). It can reduce the complexity of computations in the coding phrase. However, the blocking artifacts and undesired noises are still in the decoded images by ODBTC. In this paper, the properties of thresholds stored in the dither matrices are considered to estimate the decoded pixel intensities. That is, the dither matrices are used in both coding and decoding. Experimental results tell that the proposed schema can not only reduce quantization error but also improve the visual quality for the reconstructed images by ODBTC.

关键词： block truncation coding digital halftoning image compression ordered dither block truncation coding ordered dither technique

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Satellite/Aerial Image Compression Using Adaptive block truncation coding Technique

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JOURNAL OF THE INDIAN SOCIETY OF REMOTE SENSING 2018年第11期46卷 1761-1771页

作者： Balakrishnan, Binu Darsana, S. H. Mathews, Jayamol Nair, Madhu S. Univ Kerala Dept Comp Sci Thiruvananthapuram 695581 Kerala India Cochin Univ Sci & Technol Dept Comp Sci Kochi 682022 Kerala India

Satellite/aerial images taken from high altitude contain large amount of pixels to store accurate information. These high resolution images require large storage capacity and more transmission time. Applying an efficient compression technique on these images can reduce high storage capacity requirement and transmission time. In this paper block truncation coding (BTC) based color image compression technique for aerial/satellite images is proposed. High degree of correlation among the RGB planes of a color image can be reduced by converting these planes into HSV planes. Each of the H and S planes are encoded using BTC with quad clustering and V plane is encoded with BTC based bi-clustering or tri-clustering depending on the edge information present in the plane. The effectivity of the proposed method is validated by comparing it with the conventional BTC and its variant methods. Experimental analysis indicate that the proposed method is superior to other state of the art methods both in terms of visual quality and quantitative metrics.

关键词： Image compression block truncation coding HSV color model Clustering Aerial images

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

A Chaotic Searchable Image Encryption Scheme Integrating wit...

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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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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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Color Image coding Based on block truncation coding Using Quadtree Segmentation 3

Color Image Coding Based on Block Truncation Coding Using Qu...

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3rd International Conference on Computer and Communication Systems (ICCCS)

作者： Hu, Yu-Chen Liu, Yi-Hung Chang, I-Cheng Providence Univ Dept CSIM Taichung Taiwan Shantou Univ Business Sch Shantou Guangdong Peoples R China Natl Dong Hwa Univ Dept CSIE Hualien Taiwan

ISBN: (纸本)9781538663509

In this paper, we proposed a bit-rate adjustable color image compression technique based on block truncation coding. To exploit the similarity among the neighboring pixels, the quadtree segmentation technique is used to divide the color image into variable-sized blocks based on their block activities. Different rules are used to encode the image blocks of different sizes. Experimental results reveal that good image qualities of the reconstructed color images can be achieved by the proposed technique while keeping low bit rates.

关键词： color image coding block truncation coding quadtree segmentation bit map omission

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