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Symmetry 2018, 10(2), 36; https://doi.org/10.3390/sym10020036

Efficient Data Hiding Based on Block Truncation Coding Using Pixel Pair Matching Technique

1
School of Electrical and Computer Engineering, Nanfang College of Sun Yat-Sen University, Guangzhou 510970, China
2
School of Computer & Software, Nanjing University of Information Science & Technology, Nanjing 210044, China
Received: 22 November 2017 / Revised: 24 December 2017 / Accepted: 11 January 2018 / Published: 25 January 2018
(This article belongs to the Special Issue Emerging Data Hiding Systems in Image Communications)
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Abstract

In this paper, an efficient data hiding method that embeds data into absolute moment block truncation coding (AMBTC) codes is proposed. The AMBTC method represents image blocks by trios, and each trio consists of two quantization levels and an asymmetrically distributed bitmap. However, the asymmetric phenomena of bitmaps cause large degradation in image quality during data embedment. With the help of reference tables filled with symmetrical patterns, the proposed method exploits a symmetry adjustment model to modify the quantization levels in those smooth blocks to achieve the smallest distortion. If the block is complex, a lossless embedding method is performed to carry one additional bit. A sophisticated division switching mechanism is also proposed to modify a block from smooth to complex if the solution to the minimal distortion cannot be found. The payload can be adjusted by varying the threshold, or by embedding more bits into the quantization levels. The experiments indicate that the proposed work provides the best stego image quality under various payloads when comparing to the related prior works. View Full-Text
Keywords: AMBTC; data hiding; reference table; pixel pair matching AMBTC; data hiding; reference table; pixel pair matching
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Hong, W. Efficient Data Hiding Based on Block Truncation Coding Using Pixel Pair Matching Technique. Symmetry 2018, 10, 36.

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