2015 International Symposium of Computer Application and Information Technology (IsCait 2015)

303 / 1971-01-01 00:00:00

An Improved Adaptive Pixel Pair Matching Method Using Modified Replacement Mechanism

Pixel pair matching,APPM,PPRM,data hiding,image distortion

The method proposed a data hiding scheme that improves the adaptive pixel pair matching (APPM) method proposed by Hong and Chen in 2012. Based on pixel pair matching, APPM employs a pixel pair as an embedding unit, and use a specifically designed reference table that minimizing the embedding distortion for data embedment. Although APPM has the capability to embed secret digit in any notational system, it is likely detectable by the RS scheme if digits in 4-ary notational systems are embedded into images with large flat area (pixels having the same grayscale value) such cartoon images. In this paper, we proposed a modified version of APPM by using a revised pixel pair replacement mechanism (PPRM). With the proposed PPRM method, the stego images not only is totally undetectable by using the RS scheme but also provides the same image quality as the original APPM method.