By Clarence A. Ellis, Gary J. Nutt (auth.), Marco Ajmone Marsan (eds.)
This quantity includes the court cases of the 14th foreign convention onApplication and concept of Petri Nets. the purpose of the Petri web meetings is to create a discussion board for discussing development within the program and idea of Petri nets. often, the meetings have 150-200 contributors, one 3rd of whom come from undefined, whereas the remaining are from universities and learn institutes. the amount contains 3 invited papers, "Modeling and enactment of workflow structures" (C.A. Ellis, G.J. Nutt), "Interleaving practical and function structural research of web types" (M. Silva), and "FSPNs: fluid stochastic Petri nets" (K.S. Trivedi, V.G. Kulkarni), including 26 complete papers (selected from 102 submissions) and six venture papers.
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Additional info for Application and Theory of Petri Nets 1993: 14th International Conference Chicago, Illinois, USA, June 21–25, 1993 Proceedings
It is randomly hidden using scatter-code in quantization table. Many existing steganography techniques conceal message in AC quantized values, however, concealing in the quantization table is yet to be done. Quantization table normally does not have values of 0’s. Thus, it provides bigger capacity for hiding message. The rest of the paper is organized as follows. Section 2 describes quantization Table. Section 3 describes the proposed technique. Section 4 describes the experiment, result and discussion.
The cover file format has a critical impact on the steganographic system. Using uncompressed format for a cover file, such as BMP, provide relatively more capacity but are more likely to be detected due to high redundant content. JPEG provides a good alternative for a cover file as it is the most popular compressed image file format used in communications and in the internet. Manipulation of JPEG images with the aim of reversible data hiding has been a challenge in recent years. Steganography in JPEG images using any space, rather than DCT coefficients, would create new challenges.
Qk is the quantization table element. It specifies the kth element out of 64 elements, where k is the index in the zigzag ordering of the DCT coefficients. The quantization elements shall be specified in zig-zag scan order. There is no default DQT table recommended by . Once a DQT table has been defined for a particular destination, it replaces the previous tables stored in that destination and shall be used, when referenced, in the remaining scans of the current image and in subsequent images represented in the abbreviated format for compressed image data.