Computer Applications for Web, Human Computer Interaction, by Aun Irtaza, Arfan Jaffar, Tae-Sun Choi (auth.), Tai-hoon

By Aun Irtaza, Arfan Jaffar, Tae-Sun Choi (auth.), Tai-hoon Kim, Sabah Mohammed, Carlos Ramos, Jemal Abawajy, Byeong-Ho Kang, Dominik Ślęzak (eds.)

This e-book includes the refereed complaints of the overseas meetings, SIP, WSE, and ICHCI 2012, held along side GST 2012 on Jeju Island, Korea, in November/December 2012. The papers offered have been rigorously reviewed and chosen from quite a few submissions and concentrate on a number of the features of sign processing, photograph processing, and trend popularity, and internet technological know-how and engineering, and human laptop interaction.

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These signals are again entered to the microphone. yd (t) = y1 (t) x(t) X (f ) y0 (t) Y (f ) g y2 (t) yn (t) (a) (b) Fig. 1. Howling model. (a) AFC in the indoor reflection environment, (b) AFC model. The AFC model is shown as Fig. 1(b) and the transfer function can be represented as Y H f =X g = 1-gR f , (1) where R f is room impulse response (RIR). The frequencies at H f 2πm become potential howling frequencies, where m is an integer [1]. In indoor conditions, magnitude response is changed according to the RIR.

Jin and J. Kim embedded into the DCT coefficient. The experimental results indicate that the proposed algorithm improves the quality of the watermarked image over random block selection, and maintains a better degree of imperceptibility. We evaluated the performance of the proposed method by examining the BER under a variety of attacks. Our method showed an improve capacity and robustness under compression and noise attacks. The results demonstrate that the proposed method is robust against JPEG compression and attacks.

1. Hologram generation of a QR code In this paper, we use a QR code for the watermark information. QR codes consist of black modules (square dots) arranged in a square pattern on a white background. They have become popular in a range of environments because of their fast readability and high data capacity. Figure 1 shows the QR code and its holographic image. A Digital Watermarking Scheme Using Hologram Quantization 41 Using hologram quantization, we can restore the QR code. If a hologram (128 × 128) is generated using a QR code, then the range of the value which average of wavelet coefficient is (-9, 9).

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