In Cryptography the format of data is changed [14. The data to be hidden is usually a text or an image. Only that user who has correct key can decrypt and view the secret information. Cryptography is a method, in which the data is encrypted before transmission using a secrete key. To achieve all these, various types of Cryptographic and Steganographic methods are widely used. If the channel used for transmission is unsecured, the existence of data being transmitted itself should be hidden (Convert communication). In this case, even a little loss of data will destroy the meaning of the entire content (lossless transmission e.g: medical images, military secretes, text files etc). In some other cases the data should be transmitted in the uncompressed form. In some cases, the data can be compressed before transmission where little loss of data can be tolerated (lossy transmission, e.g: any type entertainment content). it should not be exposed to unauthorised users and also integrity of transmitted data should be assured. The information can be in the form of text, image, audio and video. Key words: – Image mosaic, Cryptography, Steganography, fitting, Colour transformation. Puzzle mosaic, which is another method of mosaic creation method used to solve some complex real time problems, is also briefly reviewed. In this paper, various image mosaic creation methods are reviewed and a comparison is made between them. To achieve this, image mosaic techniques are used with the help of Cryptographic and Steganographic methods. Also, for various reasons, there is a demand for lossless transmission of image.
Secure transmission of image has attained more importance as powerful computer tools are available for image processing. When data is being transmitted, security, confidentiality and integrity of data need to be ensured. Kurian HOD, Dept of E&C SSIT Tumakuru, IndiaĪbstract – Nowadays, most of the information is sent through internet. Professor, Dept of E&C SSIT, Tumakuru, Indiaĭr.
Tech, 2nd Sem (DEC) SSIT, Tumakuru, IndiaĪsst. A Review on Various Image Mosaic Techniques
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