Andrew Rudder

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Teaching computer programming to young students is a major challenge. This paper describes a web-based course for teaching programming using visualization and a gaming theme. Concepts are taught using real world examples that the target students can identify with; in this way some of the problems related to understanding abstract concepts are alleviated and(More)
In this paper, we propose a novel reversible steganographic technique to embed secret data into digital images compressed using vector quantization (VQ). The proposed method is based on joint neighboring and predictive coding. The proposed technique can embed n secret bits into one VQ index, where n = 1, 2, 3, and 4. Our method uses left and upper(More)
In this paper, we propose a reversible data hiding method in the spatial domain for compressed grayscale images. The proposed method embeds secret bits into a compressed thumbnail of the original image by using a novel interpolation method and the Neighbour Mean Interpolation (NMI) technique as scaling up to the original image occurs. Experimental results(More)
In this paper, we propose a reversible data hiding method in the spatial domain for compressed grayscale images. The proposed method embeds secret bits into a compressed thumbnail of the original image by using a novel interpolation method and the Neighbour Mean Interpolation (NMI) technique as scaling up to the original image occurs. Experimental results(More)
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