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This paper outlines an introduction to dendrochronology. The tree rings are being identified through image processing and statistical simulations. The study of the tree rings is known as dendrochronology but the techniques do need to be modified for better performance. Image analyses convert the tree ring into digital data using imaging tools. This method involves the scaling, piling, width calculation. Technology is required to evaluate the factors of different tree ring pattern. In this review paper, literature survey has been provided which deals with the contribution of different researchers, which methodologies they preferred and what were their limitations. And two attributes are being calculated named MSE and PSNR, as these obtainable values indicates to work further with the enhanced image. Also, researcher can get idea what all the attributes are important to implement this technique.

Now a day's Data handling very risk in internet against intruder. In case data means like text, image, audio, video etc. Stegnography is one of the best methods for secret and securely sharing data's. Real meaning for Steganography is the art of hiding the message from sender to receiver very secure method. Secure video Steganography is a challenging task of sending the embedded information to the receiver without being detected. Basically Steganography using text, image, audio, video. This paper presents a review on various techniques used for video Steganography. Here we are review about video Steganography using various techniques are discussed like DCT, DWT, LSB techniques, IWT. This paper is very helpful for video Stegnography researcher to know whether work is already available or not.